US3811795A
Expired / Lapsed
US
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High pressure fluid intensifier and method
Assignee: Flow Research Inc
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Filing: 1973-01-12
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Granted: 1974-05-21
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Expires: 1993-01-12
Abstract
Abstract A pressure intensifying apparatus to deliver a very high pressure stream of water through a nozzle. There is a single working piston having two pressure surfaces of a relatively large area, the working piston being connected to two high pressure pistons each having a pressure surface of a relatively small area. A control valve delivers a high pressure working fluid alternately to opposite sides of the working piston to cause it to reciprocate so that the pressure pistons alternately deliver water at high pressure to the nozzle. In shifting between its two end positions, the control valve passes through an intermediate position at which a restricted flow passage is provided for the working fluid, this restricted flow passage having an effective cross sectional area relative to the effective area of the discharge nozzle such that the back pressure of the restricted passage of the control valve matches the back pressure exerted on the working fluid so that a substantially constant back pressure is imposed on the high pressure source of working fluid. Further, there is a valve shifting mechanism comprising two shifting valves, each of which is responsive not only to physical contact by the working piston, but also to pressurization of its related working chamber to cause rapid shifting of the control valve.
Inventors
- 👤 J Olsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:35
CPC Classifications
F; F04; F04B; F04B9/00; F04B9/08; F04B9/10; F03; F03C; F03C1/00; F03C1/08; F03C1/10; F15; F15B; F15B3/00
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
347 words
A hydraulic power apparatus for operation, for example, as a pressure intensifying system to deliver a high pressure flow of output fluid, said apparatus comprising: a. a working cylinder, b. a working piston mounted in said working cylinder and separating said working cylinder into first and second working chambers, said working piston and cylinder being so arranged with inlet and outlet passage means as to receive pressurized working fluid of at least a predetermined pressure level alternately into said first and second working chambers, to cause said piston to reciprocate between opposite first and second end positions in said cylinder, c. a control valve means to direct pressurized fluid from a working fluid source alternately to said first and second working chambers to cause the reciprocation of said working piston, said control valve means having first and second positions to direct pressurized fluid alternately to respectively said first and second working chambers, d. a first shifting valve means operatively connected to said control valve means and having an actuating position where it causes said control valve means to be positioned in its first position to deliver pressurized working fluid to said first working chamber, said first shifting valve having first actuating means to move said first shifting valve means to its actuating position, which first actuating means is responsive to the piston moving to one of its end positions of travel and also responsive to working fluid in one of said chambers being at said predetermined pressure level, and e. a second shifting valve means operatively connected to said control valve means and having an actuating position where it causes said control valve means to be positioned in its second position to deliver pressurized working fluid to said second working chamber, said second shifting valve means having second actuating means to move said second shifting valve means to its actuating position, which second actuating means is responsive to said piston moving to the other of its end positions of travel and also responsive to working fluid in the other of said chambers being at said predetermined level.
Claim 2
Dependent Claim
347 words
A hydraulic power apparatus for operation, for example, as a pressure intensifying system to deliver a high pressure flow of output fluid, said apparatus comprising: a. a working cylinder, b. a working piston mounted in said working cylinder and separating said working cylinder into first and second working chambers, said working piston and cylinder being so arranged with inlet and outlet passage means as to receive pressurized working fluid of at least a predetermined pressure level alternately into said first and second working chambers, to cause said piston to reciprocate between opposite first and second end positions in said cylinder, c. a control valve means to direct pressurized fluid from a working fluid source alternately to said first and second working chambers to cause the reciprocation of said working piston, said control valve means having first and second positions to direct pressurized fluid alternately to respectively said first and second working chambers, d. a first shifting valve means operatively connected to said control valve means and having an actuating position where it causes said control valve means to be positioned in its first position to deliver pressurized working fluid to said first working chamber, said first shifting valve having first actuating means to move said first shifting valve means to its actuating position, which first actuating means is responsive to the piston moving to one of its end positions of travel and also responsive to working fluid in one of said chambers being at said predetermined pressure level, and e. a second shifting valve means operatively connected to said control valve means and having an actuating position where it causes said control valve means to be positioned in its second position to deliver pressurized working fluid to said second working chamber, said second shifting valve means having second actuating means to move said second shifting valve means to its actuating position, which second actuating means is responsive to said piston moving to the other of its end positions of travel and also responsive to working fluid in the other of said chambers being at said predetermined level.
Claim 3
Dependent Claim
57 words
The apparatus as recited in claim 1, wherein the actuating member of each shifting valve means is positioned to be moved to its acutating position by engagement of said piston at its respective end position of travel, and also moved to its actuating position by exposure to pressure at said predtermined level in its respective working chamber.
Claim 4
Dependent Claim
26 words
said control valve means having first and second control chambers, which, when pressurized and depressurized, moves said control valve means between its first and second positions,
Claim 5
Dependent Claim
26 words
said control valve means having first and second control chambers, which, when pressurized and depressurized, moves said control valve means between its first and second positions,
Claim 6
Dependent Claim
25 words
said control valve having first and second control chambers, which, when pressurized and depressurized, moves said control valve means between its first and second positions,
Claim 7
Dependent Claim
25 words
said control valve having first and second control chambers, which, when pressurized and depressurized, moves said control valve means between its first and second positions,
Claim 8
Dependent Claim
33 words
The apparatus as recited in claim 2, wherein said actuating member extends into an end of its respective working chamber and is urged by yielding means to extend into its respective working chamber.
Claim 9
Dependent Claim
282 words
said control valve means having other valve positioning means arranged to urge said control valve means to its intermediate position, e. a first valve shifting means having an actuating position and operatively connected to said first control chamber so as to depressurize said first control chamber when in its actuating position so as to initiate movement of said control valve means from its first position toward its second position, said first valve shifting means being responsive to move to its actuating position both by said working piston moving to its first position and by pressure in said first working chamber being at said predetermined pressure level, f. a second valve shifting means having an actuating position anD operatively connected to said second control chamber so as to depressurize said second control chamber when in its actuating position so as to initiate movement of said control valve means from its second position toward its first position, said second valve shifting means being responsive to move to its actuating position both by said working piston moving to its second position and by pressure in said second working chamber being at said predetermined pressure level, whereby when said working piston reaches one of its end positions of travel, the working piston moves a proximate shifting valve to its actuating position to cause movement of said control valve means through its intermediate position, thereby causing a pressure reduction in the previously pressurized working chamber so that the other of said shifting valve means moves to its non-actuating position and causes continued movement of said control valve means to its opposite position, thereby effecting rapid response of said control valve means between its first and second positions.
Claim 10
Dependent Claim
282 words
said control valve means having other valve positioning means arranged to urge said control valve means to its intermediate position, e. a first valve shifting means having an actuating position and operatively connected to said first control chamber so as to depressurize said first control chamber when in its actuating position so as to initiate movement of said control valve means from its first position toward its second position, said first valve shifting means being responsive to move to its actuating position both by said working piston moving to its first position and by pressure in said first working chamber being at said predetermined pressure level, f. a second valve shifting means having an actuating position anD operatively connected to said second control chamber so as to depressurize said second control chamber when in its actuating position so as to initiate movement of said control valve means from its second position toward its first position, said second valve shifting means being responsive to move to its actuating position both by said working piston moving to its second position and by pressure in said second working chamber being at said predetermined pressure level, whereby when said working piston reaches one of its end positions of travel, the working piston moves a proximate shifting valve to its actuating position to cause movement of said control valve means through its intermediate position, thereby causing a pressure reduction in the previously pressurized working chamber so that the other of said shifting valve means moves to its non-actuating position and causes continued movement of said control valve means to its opposite position, thereby effecting rapid response of said control valve means between its first and second positions.
Claim 11
Dependent Claim
159 words
said control valve means having other valve positioning means arranged to urge said control valve means to its intermediate position, d. a first and second valve shifting means operatively connected to the control chambers of the control valve means in a manner to cause movement of the control valve means between its first and second positions, the first valve shifting means having an actuating position in which it is located by said piston moving to one of its end positions of travel and also by action of said pressurized working fluid at said predetermined level in one of said chambers against said shifting valve means, said second shifting valve means also having an actuating position at which it is located by action of the piston moving to the other of its end positions of travel and also by pressurized working fluid at said predetermined level in the other of said working chambers acting against said second shifting valve means.
Claim 12
Dependent Claim
159 words
said control valve means having other valve positioning means arranged to urge said control valve means to its intermediate position, d. a first and second valve shifting means operatively connected to the control chambers of the control valve means in a manner to cause movement of the control valve means between its first and second positions, the first valve shifting means having an actuating position in which it is located by said piston moving to one of its end positions of travel and also by action of said pressurized working fluid at said predetermined level in one of said chambers against said shifting valve means, said second shifting valve means also having an actuating position at which it is located by action of the piston moving to the other of its end positions of travel and also by pressurized working fluid at said predetermined level in the other of said working chambers acting against said second shifting valve means.
Claim 13
Dependent Claim
101 words
The apparatus as recited in claim 1, wherein said control valve means has firsT and second control chambers, which, when pressurized and depressurized, move said control valve means between its first and second positions, said first shifting valve means being operatively connected to the first control chamber so as to reduce pressure in said first control chamber to move the control valve means to its first position, and said second shifting valve means being operatively connected to the second control chamber so as to reduce pressure in said second control chamber to move the control valve means to its second position.
Claim 14
Dependent Claim
53 words
The apparatus as recited in claim 4, wherein there are other positioning means for said valve control means, which other positioning means urges said control valve means to an intermediate position between said first and second positions, where working fluid at said predetermined pressure level is delivered to neither of the working chambers.
Claim 15
Dependent Claim
26 words
The apparatus as recited in claim 5, wherein said other positioning means comprises spring means which resiliently urges said control valve means to its intermediate position.
Claim 16
Dependent Claim
31 words
The apparatus as recited in claim 5, wherein said control valve means at its intermediate position functions to connect both said first and second working chambers to a low pressure area.
Claim 17
Dependent Claim
63 words
The apparatus as recited in claim 4, further comprising other valve operating means having a first position wherein said first control chamber is exposed to low pressure, and a second position wherein said second control chamber is exposed to low pressure, whereby said control valve means can be moved between its first and second positions by operation of said other valve operating means.
Claim 18
Dependent Claim
125 words
A hydraulic power apparatus for operation, for example, as a pressure intensifying system, to deliver a high pressure stream of output fluid, said apparatus comprising: a. a working cylinder, b. a working piston mounted in said working cylinder and separating said working cylinder into first and second working chambers, said working piston and cylinder being so arranged as to receive pressurized working fluid of at least a predetermined pressure level alternately into said first and second working chambers, to cause said piston to reciprocate between opposite first and second end positions in said cylinder, c. a control valve means to direct pressurized working fluid from a working fluid source alternately to said first and second working chambers to cause the reciprocation of said working piston,
Claim 19
Dependent Claim
125 words
A hydraulic power apparatus for operation, for example, as a pressure intensifying system, to deliver a high pressure stream of output fluid, said apparatus comprising: a. a working cylinder, b. a working piston mounted in said working cylinder and separating said working cylinder into first and second working chambers, said working piston and cylinder being so arranged as to receive pressurized working fluid of at least a predetermined pressure level alternately into said first and second working chambers, to cause said piston to reciprocate between opposite first and second end positions in said cylinder, c. a control valve means to direct pressurized working fluid from a working fluid source alternately to said first and second working chambers to cause the reciprocation of said working piston,
Claim 20
Dependent Claim
99 words
The apparatus as recited in claim 9, wheRein said first shifting valve means is operatively connected to the first control chamber so that with said first shifting valve means in its actuating position pressure is reduced in said first control chamber so as to cause movement of the control valve means to its first position, and said second shifting valve means being operatively connected to said second control chamber so that with said second shifting valve means in its actuating position pressure is reduced in said second control chamber to move said control valve means to its second position.
Claim 21
Dependent Claim
60 words
The apparatus as recited in claim 10, wherein each of said shifting valve means comprises an actuating member which is positioned to be moved to its actuating position by engagement with said piston at its related end position of travel and also positioned to be exposed to pressure in its related working chamber to be moved to its actuating position.
Claim 22
Dependent Claim
26 words
The apparatus as recited in claim 11, wherein said other positioning means comprises spring means which resiliently urges said control valve means to its intermediate position.
Claim 23
Dependent Claim
73 words
The apparatus as recited in claim 9, further comprising other valve operating means having a first position wherein said first control chamber is exposed to low pressure, and a second position wherein said second control chamber is exposed to low pressure, whereby said control valve means can be moved between its first and second positions by operation of said other shifting valve means. Ap the effective pressure area of the high pressure piston
Claim 24
Dependent Claim
162 words
A hydraulic power apparatus for operation as a pressure intensifying system to deliver a high pressure flow of output fluid, said apparatus comprising: a. a working cylinder, b. a working piston mounted in said working cylinder and separating said working cylinder into first and second working chambers, said working piston and cylinder being so arranged with inlet and outlet passage means as to receive pressurized working fluid of at least a predetermined pressure level alternately into said first and second working chambers, to cause said piston to reciprocate between opposite first and second end positions in said cylinder, c. first and second high pressure output piston means operatively connected to said working piston so as to be moved along reciprocating paths thereby to deliver a high pressure flow of output fluid, d. a control valve means to direct pressurized working fluid from a working fluid source alternately to said first and second working chambers to cause the reciprocation of said working piston,
Claim 25
Dependent Claim
162 words
A hydraulic power apparatus for operation as a pressure intensifying system to deliver a high pressure flow of output fluid, said apparatus comprising: a. a working cylinder, b. a working piston mounted in said working cylinder and separating said working cylinder into first and second working chambers, said working piston and cylinder being so arranged with inlet and outlet passage means as to receive pressurized working fluid of at least a predetermined pressure level alternately into said first and second working chambers, to cause said piston to reciprocate between opposite first and second end positions in said cylinder, c. first and second high pressure output piston means operatively connected to said working piston so as to be moved along reciprocating paths thereby to deliver a high pressure flow of output fluid, d. a control valve means to direct pressurized working fluid from a working fluid source alternately to said first and second working chambers to cause the reciprocation of said working piston,
Claim 26
Dependent Claim
30 words
The apparatus as recited in claim 14, wherein said other valve positioning means for said control valve means comprises means to urge said control valve means to its intermediate position.
Claim 27
Dependent Claim
47 words
The apparatus as recited in claim 14, wherein each of said shifting valve means comprises an actuating member extending into a related working chamber, whereby each of said actuating members is responsive to pressure in its related chamber as well as to engagement of said working piston.
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) | 1977-05-20 | 1977-11-19 | 1978-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-20 | 1981-11-19 | 1982-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-20 | 1985-11-19 | 1986-05-21 | $7700.00 | Window Closed / Lapsed |