US3710688A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control valve, especially for level control valve for hydropneumatic vehicle spring systems
Assignee: Daimler Benz AG
•
Filing: 1970-03-27
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Granted: 1973-01-16
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Expires: 1990-03-27
Abstract
Abstract A control valve for use in particular with a level control system for hydropneumatic vehicle springs in which the housing is provided with a housing connection for the working pressure medium line leading to the cylinder, with a housing connection for a return line, with a housing connection for a line to be connected with a pressure source and with a further housing connection for an auxiliary force; the valve includes within the valve housing, closure valves as well as a valve-adjusting member whereby the valve-adjusting member and valve housing are so connected with the working cylinder and working piston that the working piston is normally adjusted into a first intended position when the pressure medium source supplies a pressure to the corresponding housing connection; the supply of an auxiliary pressure force to the corresponding housing connection causes the parts to be adjusted to a new position in which a second new desired position of the working piston relative to the working cylinder is established; additionally, by appropriate switching of the pressure medium and auxiliary pressure force, the working piston can be displaced into an end position while a communication of the housing connections for the pressure medium and the auxiliary pressure medium with the return line causes the working spaces in the working cylinder to be closed.
Inventors
- 👤 K Bauer
- 👤 F Naumann
- 👤 H Schobbe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:18
CPC Classifications
B; B60; B60G; B60G17/00; B60G17/02; B60G17/04; B60G17/056
Claims Analysis
Total Claims: 48
Claim 1
Independent Claim
576 words
A control valve with a working pressure medium line for connection with at least one working-medium device having two parts to be adjusted relative to one another into an intended position and consisting of working cylinder and piston means, in which the working-pressure medium line is closed in a center position of a valve-adjusting means and in which, during a deflection of the valve-adjusting means in one direction, the working pressure medium line is brought into communication with a pressure source connection whereas during deflection of the valve-adjusting means in the opposite direction, the working pressure medium line is brought into communication with a pressure-relieved return line connection, first means forming in effect a first coupling system including valve housing means and a plurality of closure valve means, said closure valve means forming a first end member of the first coupling system, and said valve housing means serving as a functionally adjacent member for said first end member, second means forming in effect a second coupling system including said valve-adjusting means and control linkage means, said valve adjusting means forming a second end member of the second coupling system and said control linkage means serving as a functionally adjacent member for said second end member, and in which the first means is relatively fixedly arranged relative to one of said two parts while said second means is relatively fixedly arranged relative to the other of said two parts, characterized in that one of the first and second end members of said first and second means is adjustably connected with the functionally adjacent member of its coupling system and is adjustable by a pressure medium auxiliary motor means arranged on the inside of the valve housing means from a normal, first center position with respect to the other of said first and second end members into at least one additional center position so that upon displacement of said one end member from its pre-existing into its new center position, one of said closure valve means is initially opened whereby the coupling system having the other of said first and second end members is brought back into its relative center position with respect to the coupling system having said one end member as a result of the positional change of the working piston means occurring as a consequence of the opening of said one closure valve means, and therefore said one closure valve means is closed again, whereas at least another of said closure valve means is temporarily opened as a result of the return movement of the adjustable end member into the first center position, and a valve means being arranged in a line forming the working pressure medium connection for the control valve between a pressure source and an associated housing connection of the control valve, in a line forming the pressure-relieved return line connection for the control valve between a reservoir for the pressure source and an associated housing connection of the control valve, as well as in a line forming an auxiliary force pressure medium connection between the pressure source and an associated housing connection of the control valve, for the selective control of the pressure medium force in said working pressure medium connection line and said auxiliary force line in such a manner that either one or both lines are opened or closed for the pressure medium force, the lines in the closed condition being in communication with the pressure-relieved return line connection.
Claim 2
Dependent Claim
576 words
A control valve with a working pressure medium line for connection with at least one working-medium device having two parts to be adjusted relative to one another into an intended position and consisting of working cylinder and piston means, in which the working-pressure medium line is closed in a center position of a valve-adjusting means and in which, during a deflection of the valve-adjusting means in one direction, the working pressure medium line is brought into communication with a pressure source connection whereas during deflection of the valve-adjusting means in the opposite direction, the working pressure medium line is brought into communication with a pressure-relieved return line connection, first means forming in effect a first coupling system including valve housing means and a plurality of closure valve means, said closure valve means forming a first end member of the first coupling system, and said valve housing means serving as a functionally adjacent member for said first end member, second means forming in effect a second coupling system including said valve-adjusting means and control linkage means, said valve adjusting means forming a second end member of the second coupling system and said control linkage means serving as a functionally adjacent member for said second end member, and in which the first means is relatively fixedly arranged relative to one of said two parts while said second means is relatively fixedly arranged relative to the other of said two parts, characterized in that one of the first and second end members of said first and second means is adjustably connected with the functionally adjacent member of its coupling system and is adjustable by a pressure medium auxiliary motor means arranged on the inside of the valve housing means from a normal, first center position with respect to the other of said first and second end members into at least one additional center position so that upon displacement of said one end member from its pre-existing into its new center position, one of said closure valve means is initially opened whereby the coupling system having the other of said first and second end members is brought back into its relative center position with respect to the coupling system having said one end member as a result of the positional change of the working piston means occurring as a consequence of the opening of said one closure valve means, and therefore said one closure valve means is closed again, whereas at least another of said closure valve means is temporarily opened as a result of the return movement of the adjustable end member into the first center position, and a valve means being arranged in a line forming the working pressure medium connection for the control valve between a pressure source and an associated housing connection of the control valve, in a line forming the pressure-relieved return line connection for the control valve between a reservoir for the pressure source and an associated housing connection of the control valve, as well as in a line forming an auxiliary force pressure medium connection between the pressure source and an associated housing connection of the control valve, for the selective control of the pressure medium force in said working pressure medium connection line and said auxiliary force line in such a manner that either one or both lines are opened or closed for the pressure medium force, the lines in the closed condition being in communication with the pressure-relieved return line connection.
Claim 3
Dependent Claim
498 words
A control valve with a working pressure medium line for connection with at least one working-medium device having two parts to be adjusted relative to one another into an intended position and consisting of working cylinder and piston means, in which the working-pressure medium line is closed in a center position of a valve-adjusting means and in which, during a deflection of the valve-adjusting means in one direction, the working pressure medium line is brought into communication with a pressure source connection whereas during deflection of the valve-adjusting means in the opposite direction, the working pressure medium line is brought into communication with a pressure-relieved return line connection, first means forming in effect a first coupling system including valve housing means and closure valve means, said closure valve means forming an end member of the first coupling system, and said valve housing means serving as a functionally adjacent member for said end member, second means forming in effect a second coupling system including said valve-adjusting means and control linkage means, said valve adjusting means forming an end member of the second coupling system and said control linkage means serving as a functionally adjacent member for said end member, and in which the first means is relatively fixedly arranged relative to one of said two parts while said second means is relatively fixedly arranged relative to the other of said two parts, characterized in that one of the two end members of said first and second means is adjustably connected with the functionally adjacent member of its coupling system and is adjustable by a pressure medium auxiliary motor means arranged on the inside of the valve housing means from a normal, first center position with respect to the other end member into at least one additional center position so that upon displacement of said one end member from its pre-existing into its new center position, one of said cLosure valve means is initially opened and thereafter the coupling system having the other end member is brought back into its relative center position with respect to the coupling system having said one end member as a result of the positional change of the working piston means occurring as a consequence of such valve opening, and thereafter said one closure valve means is closed again, whereas the other closure valve means is temporarily opened as a result of the return movement of the adjustable end member into the first center position, said valve-housing means being provided with channel means including a by-pass channel means, by way of which a direct communication is established between a housing connection for the working pressure medium line and a housing connection for a pressure medium auxiliary line leading to said auxiliary motor means, and closure valve means arranged in the by-pass channel means which is controlled in the closing direction by the operating pressure present in the one of the housing channel means having a free communication with the housing connection for the pressure source.
Claim 4
Dependent Claim
498 words
A control valve with a working pressure medium line for connection with at least one working-medium device having two parts to be adjusted relative to one another into an intended position and consisting of working cylinder and piston means, in which the working-pressure medium line is closed in a center position of a valve-adjusting means and in which, during a deflection of the valve-adjusting means in one direction, the working pressure medium line is brought into communication with a pressure source connection whereas during deflection of the valve-adjusting means in the opposite direction, the working pressure medium line is brought into communication with a pressure-relieved return line connection, first means forming in effect a first coupling system including valve housing means and closure valve means, said closure valve means forming an end member of the first coupling system, and said valve housing means serving as a functionally adjacent member for said end member, second means forming in effect a second coupling system including said valve-adjusting means and control linkage means, said valve adjusting means forming an end member of the second coupling system and said control linkage means serving as a functionally adjacent member for said end member, and in which the first means is relatively fixedly arranged relative to one of said two parts while said second means is relatively fixedly arranged relative to the other of said two parts, characterized in that one of the two end members of said first and second means is adjustably connected with the functionally adjacent member of its coupling system and is adjustable by a pressure medium auxiliary motor means arranged on the inside of the valve housing means from a normal, first center position with respect to the other end member into at least one additional center position so that upon displacement of said one end member from its pre-existing into its new center position, one of said cLosure valve means is initially opened and thereafter the coupling system having the other end member is brought back into its relative center position with respect to the coupling system having said one end member as a result of the positional change of the working piston means occurring as a consequence of such valve opening, and thereafter said one closure valve means is closed again, whereas the other closure valve means is temporarily opened as a result of the return movement of the adjustable end member into the first center position, said valve-housing means being provided with channel means including a by-pass channel means, by way of which a direct communication is established between a housing connection for the working pressure medium line and a housing connection for a pressure medium auxiliary line leading to said auxiliary motor means, and closure valve means arranged in the by-pass channel means which is controlled in the closing direction by the operating pressure present in the one of the housing channel means having a free communication with the housing connection for the pressure source.
Claim 5
Dependent Claim
31 words
A control valve according to claim 2, characterized in that a check valve means opening in the direction toward the working medium pressure line is arranged in the by-pass channel means.
Claim 6
Dependent Claim
67 words
A control valve according to claim 3, characterized in that a closure valve means adapted to be controlled in the opening direction is arranged in the housing channel means having a free communication with the housing connection for the working pressure medium line and is controllable by the operating pressure of the housing channel means having a free communication with the housing connection for the pressure source.
Claim 7
Dependent Claim
51 words
A control valve according to claim 4, characterized in that the closure valve means of the housing channel means having a free communication with the housing connection for the working pressure medium line is constructed as a check valve adapted to open in the direction toward the working pressure medium line.
Claim 8
Dependent Claim
93 words
A control valve according to claim 5, characterized by valve means arranged in a line forming a working pressure medium connection between said pressure source and an associated housing connection of the control valve as well as in a line forming an auxiliary force pressure medium connection between the pressure source and an associated housing connection of the control valve, for the selective control of the pressure medium force in said last-mentioned two lines in such a manner that either one or both lines are opened or closed for the pressure medium force.
Claim 9
Dependent Claim
67 words
A control valve according to claim 2, characterized in that a closure valve means adapted to be controlled in the opening direction is arranged in the housing channel means having a free communication with the housing connection for the working pressure medium line and is controllable by the operating pressure of the housing channel means having a free communication with the housing connection for the pressure source.
Claim 10
Dependent Claim
51 words
A control valve according to claim 7, characterized in that the closure valve means of the housing channel means having a free communication with the housing connection for the working pressure medium line is constructed as a check valve adapted to open in the direction toward the working pressure medium line.
Claim 11
Dependent Claim
93 words
A control valve according to claim 2, characterized by valve means arranged in a line forming a working pressure medium connection between said pressure source and an associated housing connection of the control valve as well as in a line forming an auxiliary force pressure medium connection between the pressure source and an associated housing connection of the control valve, for the selective control of the pressure medium force in said last-mentioned two lines in such a manner that either one or both lines are opened or closed for the pressure medium force.
Claim 12
Dependent Claim
146 words
A control valve according to claim 1, characterized in that an adjusting slide vAlve means arranged pressure-tight and displaceable in a housing bore of the valve housing means includes a pressure medium space as well as inlet and outlet channel means, and in that the pressure medium space is in continuous free communication with a first housing channel means that is adapted to be brought into communication with the housing connection for the working pressure medium line, and in that the pressure medium space is operatively connected by way of a respective one of said closure valve means adapted to be opened by the valve adjusting means with the inlet as well as with the outlet channel means, and in that both the inlet as well as the outlet channel means is in constant free communication with a respective one of two further housing channel means.
Claim 13
Dependent Claim
52 words
A control valve according to claim 10, characterized in that the adjusting slide valve means has a piston surface which is arranged in a section of the housing bore in which terminates a fourth housing channel means which is in free communication with the housing connection for the pressure medium auxiliary force.
Claim 14
Dependent Claim
103 words
A control valve according to claim 11, characterized in that the adjusting slide valve means is provided with a concentric axial bore which terminates at its ends in two sections of the housing bore separated from each other in a pressure-tight manner, and in that the axial bore is closed off by a check valve means opening into one of the sections and forming one of said closure valve means, said last-mentioned check valve means being pushed open by a valve-adjusting rod of said valve adjusting means extending through the other section of the housing bore and arranged coaxially in the axial bore.
Claim 15
Dependent Claim
109 words
A control valve according to claim 12, characterized in that a circumferential groove provided in the adjusting slide valve means is in free communication with a third section separated in a pressure-tight manner from the other two sections of the housing bore and is operatively connected by a check valve means forming another one of said closure valve means and adapted to be opened by the valve-adjusting rod, with the section of the housing bore through which extends the valve-adjusting rod, and in that the housing channel means terminates in the third section of said housing bore which is operatively connected with the housing connection for the return line.
Claim 16
Dependent Claim
103 words
A control valve according to claim 10, characterized in that the adjusting slide valve means is provided with a concentric axial bore which terminates at its ends in two sections of the housing bore separated from each other in a pressure-tight manner, and in that the axial bore is closed off by a check valve means opening into one of the sections and forming one of said closure valve means, said last-mentioned check valve means being pushed open by a valve-adjusting rod of said valve adjusting means extending through the other section of the housing bore and arranged coaxially in the axial bore.
Claim 17
Dependent Claim
109 words
A control valve according to claim 14, characterized in that a circumferential groove provided in the adjusting slide valve means is in free communication with a third section separated in a pressure-tight manner from the other two sections of the housing bore and is operatively connected by a check valve means forming another one of said closure valve means and adapted to be opened by the valve-adjusting rod, with the section of the housing bore through which extends the valve-adjusting rod, and in that the housing channel means terminates in the third section of said housing bore which is operatively connected with the housing connection for the return line.
Claim 18
Dependent Claim
100 words
A control valve according to claim 13, characterized in that said valve-housing means is provided with channel means including a by-pass channel means, by way of which a direct communication is established between the housing connection for the working pressure medium line and the housing connection for a pressure medium auxiliary line leading to said auxiliary motor meaNs, and closure valve means arranged in the by-pass channel means which is controlled in the closing direction by the operating pressure present in the one of the housing channel means having a free communication with the housing connection for the pressure source.
Claim 19
Dependent Claim
31 words
A control valve according to claim 16, characterized in that a check valve means opening in the direction toward the working medium pressure line is arranged in the by-pass channel means.
Claim 20
Dependent Claim
67 words
A control valve according to claim 17, characterized in that a closure valve means adapted to be controlled in the opening direction is arranged in the housing channel means having a free communication with the housing connection for the working pressure medium line and is controllable by the operating pressure of the housing channel means having a free communication with the housing connection for the pressure source.
Claim 21
Dependent Claim
51 words
A control valve according to claim 18, characterized in that the closure valve means of the housing channel means having a free communication with the housing connection for the working pressure medium line is constructed as a check valve adapted to open in the direction toward the working pressure medium line.
Claim 22
Dependent Claim
150 words
A control valve according to claim 1, characterized in that a valve-adjusting shaft means supported axially adjustable with respect to the closure valve means arranged in the valve housing means is non-rotatably connected with the control linkage means in relation to its shaft axis and longitudinally displaceable along said axis, and in that the valve-adjusting shaft means is provided for each of its center positions disposed one behind the other in the circumferential direction with a separate axially extending control edge pair for the adjustment of the working piston means into the desired position thereof as also with two control edges extending in the circumferential direction for the adjustment of the working piston means between two desired positions, and in that the valve-adjusting shaft means is rotatably and axially displaceably connected with a coaxial auxiliary adjusting piston means guided in a pressure-tight and displaceable manner in the valve housing means.
Claim 23
Dependent Claim
83 words
A control valve according to claim 20, characterized in that two trough-shaped recesses disposed mutually axially offset and mutually offset in the circumferential direction are provided at the circumference of the valve-adjusting shaft means, the lateral edges of said recesses mutually facing in the circumferential direction being constructed step-shaped in such a manner that the axial control edge for one center position is connected by a control edge extending in the circumferential direction with the axial control edge for the adjacent center position.
Claim 24
Dependent Claim
139 words
A control valve according to claim 20, characterized in that five substantially H-shaped housing channel means are arranged in a first housing plane containing the axis of the valve-adjusting shaft means, the web channel means disposed parallel to the valve-adjusting shaft means being operatively connected by a respective closure check valve forming one of said closure valve means and adapted to be opened by the valve-adjusting shaft means, with two parallel leg channel means disposed on different sides of the web channel means and perpendicular to the valve-adjusting shaft means, and in that each of said leg channel means is in free communication with a respective housing cross channel means substantially perpendicular to the first housing plane, said last-mentioned housing cross channel means terminating, in turn, in a housing connection for the pressure source and the return line, respectively.
Claim 25
Dependent Claim
199 words
A control valve according to claim 22, characterized in that the leg channel means disposed together with the valve shaft means on the same side of the web channel means, terminate in the housing bore of the valve shaft means, and in that the closure check valve means of one of said leg channel means opens into the web channel means and is pushEd open by a ball cooperating with the associated recess of the valve-adjusting shaft means, said ball being form-lockingly and displaceably guided in the end section on the side of the shaft of said one leg channel means, and in that an adjusting piston means is guided in a pressure-tight and displaceable manner in the other leg channel means terminating in the housing bore of the valve adjusting shaft means, the adjusting piston means abutting at its shaft side end at a further ball form-lockingly and displaceably guided in the other leg channel means, said further ball cooperating with the other recess of the valve-adjusting shaft means, and in that the adjusting piston means controls with its other end the other closure check valve means opening in the direction of the opposite coaxial leg channel means.
Claim 26
Dependent Claim
143 words
A control valve according to claim 23, characterized in that the free fourth leg channel means is in free communication both with the web channel means as also with a third housing cross channel means disposed substantially perpendicularly to the housing plane, and in that the third housing cross channel means terminates in a housing channel means which is arranged in a second housing plane parallel to the first housing plane, and in that the last-mentioned housing channel means is adapted to be brought into communication by a closure check valve means adapted to be opened with at least one further housing channel means of the second housing plane which in its turn is in free communication by way of an additional housing cross channel means substantially perpendicular to the second housing plane with a housing connection for the working pressure medium line.
Claim 27
Dependent Claim
136 words
A control valve according to claim 24, characterized in that four housing channel means arranged in substantially rectangular shape are provided in the second housing plane extending through the working space of the auxiliary adjusting piston means, said last-mentioned four housing channel means including two longitudinal channel means extending substantially parallelly to the valve-adjusting shaft means and two lateral channel means extending substantially perpendicularly thereto, one of said lateral channel means having a channel section subdivided by a closure valve means adapted to be opened, said channel section being in free communication both with said working space of the auxiliary adjusting piston means as also with a further housing cross channel means substantially perpendicular to said second housing plane, said further housing cross channel means terminating in the housing connection for the pressure medium auxiliary force.
Claim 28
Dependent Claim
73 words
A control valve according to claim 25, characterized in that an adjusting piston means cooperating with the last-mentioned closure valve means is guided in a pressure-tight and displaceable manner in the section of the lateral channel means adapted to be closed with respect to the working space by the auxiliary adjusting piston means, and in that said last-mentioned channel section is in free communication at its ends with the two longitudinal channel means.
Claim 29
Dependent Claim
132 words
A control valve according to claim 26, characterized in that the housing cross channel means in free communication with the web channel means of the first housing plane terminates in one longitudinal channel means of the second housing plane between the closure valve means adapted to be opened and an associated adjusting piston means guided in said longitudinal channel means in a pressure-tight and displaceable manner, and in that the end of said last-mentioned longitudinal channel means opposite said last-mentioned closure valve means is in free communication with the housing cross channel means terminating in the housing connection for the pressure source as also with the adjoining section of the one of said lateral channel means adapted to be closed off with respect to the working space by said auxiliary piston means.
Claim 30
Dependent Claim
159 words
A control valve according to claim 27, characterized in that the other longiTudinal channel means of said second housing plane is subdivided by a check valve means into a by-pass channel section and a further channel section, and in that the by-pass channel section terminates in the section of said one lateral channel means adapted to be closed with respect to the working space by said auxiliary adjusting piston means, and in that the other channel section of the other longitudinal channel means is in free communication with a housing cross channel means terminating in the housing connection for one working pressure medium line as also with the other lateral channel means, and that said other lateral channel means is operatively connected with the first longitudinal channel means by way of one of said check-valve means and is in free communication with a further housing cross channel terminating in a second housing connection for another working pressure medium line.
Claim 31
Dependent Claim
83 words
A control valve according to claim 28, characterized in that two trough-shaped recesses disposed mutually axially offset and mutually offset in the circumferential direction are provided at the circumference of the valve-adjusting shaft means, the lateral edges of said recesses mutually facing in the circumferential direction being constructed step-shaped in such a manner that the axial control edge for one center position is connected by a control edge extending in the circumferential direction with the axial control edge for the adjacent center position.
Claim 32
Dependent Claim
119 words
A control valve according to claim 1, characterized in that the valve-adjusting means is constructed as multi-partite adjusting unit, having an input member operatively connected with the control linkage means and adapted to be adjusted into several operating positions by the pressure medium auxiliary force with respect to an output member equipped with means for the actuation of said closure valve means arranged in the valve housing means so that the input member assumes for each intended position of the working piston means a different center position with respect to the closure valve means whereas the output member has in all intended positions of the working piston means the same center position with respect to the closure valve means.
Claim 33
Dependent Claim
105 words
A control valve according to claim 30, characterized in that a rotary slide valve means rotatably and axially non-displaceably supported in the valve housing means is non-rotatably connected with an adjusting sleeve means which is operatively connected for relative spiral movement by way of inclined surface means with a valve-adjusting shaft means operatively connected with the control linkage means, and in that the helically adjustable member of the valve adjusting shaft means which is adjustable by the pressure medium auxiliary force, is supported axially adjustable in the valve housing means whereas the other helically movable adjusting member thereof is non-adjustably mounted in the valve-housing means.
Claim 34
Dependent Claim
67 words
A control valve according to claim 31, characterized in that the axially adjustable valve-adjusting shaft means is operatively connected with the control linkage means non-rotatably in relation to its axis and displaceably along said axis and is non-displaceably supported at least in one direction in a sleeve-shaped auxiliary adjusting piston means which, in its turn, is guided in a pressure-tight and displaceable manner in a housing bore.
Claim 35
Dependent Claim
50 words
A control valve according to claim 31, characterized in that the valve-adjusting shaft means is supported at one end by the auxiliary adjusting piston means in the manner of a bearer on two supports and at the other end radially in the valve housing means by the adjusting sleeve means.
Claim 36
Dependent Claim
66 words
A control valve according to claim 32, characterized in that the auxiliary adjusting piston means engages at one end at a collar of the valve-adjusting shaft means and is provided at the other end with an external abutment ring, and in that a sleeve of elastic material and concentric to the auxiliary adjusting piston means is arranged betWeen the abutment ring and the valve housing means.
Claim 37
Dependent Claim
54 words
A control valve according to claim 34, characterized in that the section of the valve-adjusting shaft means engaging in the adjusting sleeve means is provided with at least one longitudinal groove inclined to the axis of rotation, in which a fixed coupling pin of the adjusting sleeve means is guided non-rotatably and longitudinally displaceably.
Claim 38
Dependent Claim
155 words
A control valve according to claim 35, characterized in that four housing channel means arranged in a substantially rectangular shape and mutually connected at the corners thereof are provided in a housing plane parallel to the plane of rotation of the rotary slide valve means, two of said housing channel means being adapted to be closed off at the free ends thereof by a respective closure valve means with respect to another housing channel means, in that the mutually connected channel sections of said two last-mentioned housing channel means are in free communication with a housing connection for the pressure source as well as with a housing longitudinal channel means substantially parallel to the axis of the valve-adjusting shaft means, said last-mentioned longitudinal channel means being operatively connected with the housing space of the rotary slide valve means by way of a check valve means adapted to be opened by the rotary slide valve means.
Claim 39
Dependent Claim
118 words
A control valve according to claim 36, characterized in that the housing channel means provided with the closure valve means adapted to be opened is subdivided into a second channel section by an adjusting piston means guided in a pressure-tight and displaceable manner in said channel section and having a free communication with the housing connection for the pressure source, said second channel section being in free communication with a further housing longitudinal channel means and being operatively connected with the third housing channel means of said housing plane by way of said last-mentioned closure valve means, and in that the third housing channel means terminates in at least one housing connection for a working pressure medium line.
Claim 40
Dependent Claim
111 words
A control valve according to claim 37, characterized in that the housing channel means provided with the closure valve means adapted to be closed includes a second channel section which is subdivided with respect to the channel section having the free communication to the housing connection for the pressure source by an adjusting piston means guided in the housing channel in a pressure-tight and displaceable manner, and in that the second channel section is in free communication with the fourth housing channel means and in that the fourth housing channel means terminates in the housing channel means with the free communication with a housing connection for a working pressure medium line.
Claim 41
Dependent Claim
79 words
A control valve according to claim 38, characterized in that a by-pass channel means arranged in said housing plane is operatively connected at one of its ends by said closure valve means adapted to be closed with the fourth housing channel means having a free communication with the housing connections for a pressure medium line each and is in free communication by way of a further housing channel means with the housing connection for the pressure medium auxiliary force.
Claim 42
Dependent Claim
88 words
A control valve according to claim 39, characterized in that the closure valve means adapted to be closed has a closure cone portion acting as check valve which, in its turn, is adapted to be brought into abutment against the orifice of the by-pass channel means and, on the other, at the adjusting piston means of the closure valve means, and in that said adjusting piston means is adapted to be supported in the opening direction of a closure ball at a housing edge of its channel section.
Claim 43
Dependent Claim
67 words
A control valve according to claim 40, characterized in that the axially adjustable valve-adjusting shaft means is operatively connected with the control linkage means non-rotatably in relation to its axis and displaceaBly along said axis and is non-displaceably supported at least in one direction in a sleeve-shaped auxiliary adjusting piston means which, in its turn, is guided in a pressure-tight and displaceable manner in a housing bore.
Claim 44
Dependent Claim
155 words
A control valve according to claim 31, characterized in that four housing channel means arranged in a substantially rectangular shape and mutually connected at the corners thereof are provided in a housing plane parallel to the plane of rotation of the rotary slide valve means, two of said housing channel means being adapted to be closed off at the free ends thereof by a respective closure valve means with respect to another housing channel means, in that the mutually connected channel sections of said two last-mentioned housing channel means are in free communication with a housing connection for the pressure source as well as with a housing longitudinal channel means substantially parallel to the axis of the valve-adjusting shaft means, said last-mentioned longitudinal channel means being operatively connected with the housing space of the rotary slide valve means by way of a check valve means adapted to be opened by the rotary slide valve means.
Claim 45
Dependent Claim
118 words
A control valve according to claim 42, characterized in that the housing channel means provided with the closure valve means adapted to be opened is subdivided into a second channel section by an adjusting piston means guided in a pressure-tight and displaceable manner in said channel section and having a free communication with the housing connection for the pressure source, said second channel section being in free communication with a further housing longitudinal channel means and being operatively connected with the third housing channel means of said housing plane by way of said last-mentioned closure valve means, and in that the third housing channel means terminates in at least one housing connection for a working pressure medium line.
Claim 46
Dependent Claim
111 words
A control valve according to claim 43, characterized in that the housing channel means provided with the closure valve means adapted to be closed includes a second channel section which is subdivided with respect to the channel section having the free communication to the housing connection for the pressure source by an adjusting piston means guided in the housing channel in a pressure-tight and displaceable manner, and in that the second channel section is in free communication with the fourth housing channel means and in that the fourth housing channel means terminates in the housing channel means with the free communication with a housing connection for a working pressure medium line.
Claim 47
Dependent Claim
79 words
A control valve according to claim 44, characterized in that a by-pass channel means arranged in said housing plane is operatively connected at one of its ends by said closure valve means adapted to be closed with the fourth housing channel means having a free communication with the housing connections for a pressure medium line each and is in free communication by way of a further housing channel means with the housing connection for the pressure medium auxiliary force.
Claim 48
Dependent Claim
88 words
A control valve according to claim 45, characterized in that the closure valve means adapted to be closed has a closure cone portion acting as check valve which, in its turn, is adapted to be brought into abutment against the orifice of the by-pass channel means and, on the other, at the adjusting piston means of the closure valve means, and in that said adjusting piston means is adapted to be supported in the opening direction of a closure ball at a housing edge of its channel section.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-16 | 1976-07-17 | 1977-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-16 | 1980-07-17 | 1981-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-16 | 1984-07-17 | 1985-01-16 | $7700.00 | Window Closed / Lapsed |