US3714868A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve system for proportional flow control for fluid-operated motor
Assignee: Marotta Scientific Controls Inc
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Filing: 1970-09-23
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Granted: 1973-02-06
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Expires: 1990-09-23
Abstract
Abstract This system for controlling the flow of working fluid to and from a motor includes valves that regulate the working fluid flow so that it is proportional to the force applied to move the valves into open position regardless of changes in pressure in the system. The motor is double-acting and its movement is sometimes against the load and sometimes in a direction in which the load assists the movement of the motor. In the latter case it is important that the exhaust from the motor be regulated to control the speed since the supply of working fluid to the other end of the motor may produce excessive speed. Both the rate of inlet and exhaust of the working fluid, therefore, are determined by proportional flow control valves having their flow dependent upon the force applied to solenoids or other actuators for the valves.
Inventors
- 👤 S Kowalski
- 👤 D Worden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:00
CPC Classifications
F; F15; F15B; F15B13/00; F15B13/02; F15B13/04; F15B13/0401; F15B13/0405; F15B11/00; F15B11/006; F15B13/0416; F15B13/0417; F15B13/042; F15B13/043; F15B13/0433; F15B2211/00; F15B2211/30; F15B2211/305; F15B2211/30505; F15B2211/3056; F15B2211/30565; F15B2211/30575; F15B2211/32; F15B2211/327; F15B2211/329; F15B2211/35; F15B2211/351; F15B2211/353; F15B2211/40; F15B2211/405; F15B2211/40507; F15B2211/40515; F15B2211/465; F15B2211/70; F15B2211/705; F15B2211/7051; F15B2211/7053; F15B2211/7054; F15B2211/75
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
240 words
A flow control including in combination a plurality of flow-responsive valve means, said valve means comprising inlet control valve means and exhaust control valve means, each of said flow-responsive valve means comprising a valve element, a restricted passage through which fluid flows when the valve element is in open position, and comprising also a part subject on opposite sides to the fluid pressure upstream and downstream, respectively, of the restricted passage, said part being connected with the valve element and urging the valve element toward closed position with a force proportional to the excess of upstream pressure over downstream pressure, a motor that has a housing and an element movable with respect to the housing through a stroke, passages that connect with the housing on opposite sides of the movable element, said valve elements of different valve means controlling flow of working fluid to and from said passages for power and exhaust strokes, respectively, actuating means for the valve means, said actuating means including a signal-operated actuator that applies force to inlet control valve means for admitting working fluid to one end of the motor housing, another actuator that applies force to exhaust control valve means for the opposite end of the motor housing, said actuator that applies force to the exhaust control valve means being responsive to pressure of working fluid that flows in response to the same signal as operates the actuator for the inlet control valve means.
Claim 2
Dependent Claim
240 words
A flow control including in combination a plurality of flow-responsive valve means, said valve means comprising inlet control valve means and exhaust control valve means, each of said flow-responsive valve means comprising a valve element, a restricted passage through which fluid flows when the valve element is in open position, and comprising also a part subject on opposite sides to the fluid pressure upstream and downstream, respectively, of the restricted passage, said part being connected with the valve element and urging the valve element toward closed position with a force proportional to the excess of upstream pressure over downstream pressure, a motor that has a housing and an element movable with respect to the housing through a stroke, passages that connect with the housing on opposite sides of the movable element, said valve elements of different valve means controlling flow of working fluid to and from said passages for power and exhaust strokes, respectively, actuating means for the valve means, said actuating means including a signal-operated actuator that applies force to inlet control valve means for admitting working fluid to one end of the motor housing, another actuator that applies force to exhaust control valve means for the opposite end of the motor housing, said actuator that applies force to the exhaust control valve means being responsive to pressure of working fluid that flows in response to the same signal as operates the actuator for the inlet control valve means.
Claim 3
Dependent Claim
240 words
A flow control including in combination a plurality of flowresponsive valve means, said valve means comprising inlet control valve means and exhaust control valve means, each of said flowresponsive valve means comprising a valve element, a restricted passage through which fluid flows when the valve element is in open position, and comprising also a part subject on opposite sides to the fluid pressure upstream and downstream, respectively, of the restricted passage, said part being connected with the valve element and urging the valve element toward closed position with a force proportional to the excess of upstream pressure over downstream pressure, a motor that has a housing and an element movable with respect to the housing through a stroke, passages that connect with the housing on opposite sides of the movable element, said valve elements of different valve means controlling flow of working fluid to and from said passages for power and exhaust strokes, respectively, actuating means for the valve means, said actuating means including a signal-operated actuator that applies force to inlet control valve means for admitting working fluid to one end of the motor housing, another actuator that applies force to exhaust control valve means for the opposite end of the motor housing, said actuator that applies force to the exhaust control valve means being responsive to pressure of working fluid that flows in response to the same signal as operates the actuator for the inlet control valve means.
Claim 4
Dependent Claim
240 words
A flow control including in combination a plurality of flowresponsive valve means, said valve means comprising inlet control valve means and exhaust control valve means, each of said flowresponsive valve means comprising a valve element, a restricted passage through which fluid flows when the valve element is in open position, and comprising also a part subject on opposite sides to the fluid pressure upstream and downstream, respectively, of the restricted passage, said part being connected with the valve element and urging the valve element toward closed position with a force proportional to the excess of upstream pressure over downstream pressure, a motor that has a housing and an element movable with respect to the housing through a stroke, passages that connect with the housing on opposite sides of the movable element, said valve elements of different valve means controlling flow of working fluid to and from said passages for power and exhaust strokes, respectively, actuating means for the valve means, said actuating means including a signal-operated actuator that applies force to inlet control valve means for admitting working fluid to one end of the motor housing, another actuator that applies force to exhaust control valve means for the opposite end of the motor housing, said actuator that applies force to the exhaust control valve means being responsive to pressure of working fluid that flows in response to the same signal as operates the actuator for the inlet control valve means.
Claim 5
Dependent Claim
63 words
The flow control described in claim 1 characterized by the actuator for the exhaust control valve means having an operating element subject to the pressure of the working fluid flowing to the motor housing, and a connecting passage leading from the actuator for the exhaust control valve means to the passage which leads from the inlet control valve means to the motor housing.
Claim 6
Dependent Claim
113 words
The flow control described in claim 2 characterized by there being separate inlet and exhaust passages communicating with one end of the motor housing, and other inlet and exhaust passages communicating with the other end of the motor housing, the inlet control valve means of claim 5 controlling flow of working fluid at a different end of the motor housing from that from which working fluid is controlled by the exhaust control valve means, and other inlet control and exhaust control means and actuators in a similar relation to one another as those of claim 5 for controlling the flow of working fluid to and from the other inlet and exhaust passages, respectively.
Claim 7
Dependent Claim
69 words
The flow control described in claim 3 characterized by check valves in the inlet passAges to prevent flow of working fluid from the motor housing back from the inlet passages, the exhaust control valve means being oriented to act as check valves to prevent exhaust of working fluid from the motor housing through the exhaust passages, the exhaust control valve means being movable into open position by their actuators.
Claim 8
Dependent Claim
32 words
The flow control described in claim 4 characterized by a pressure relief valve in position to relieve excessive pressure in the passage between each exhaust control valve means and the motor housing.
Claim 9
Dependent Claim
91 words
The flow control described in claim 3 characterized by the actuators for the inlet control valve means that control the flow of working fluid to the motor including electromagnetic means operable to move the valve elements toward open position and opposing the differential pressure across the part which is connected with the valve element, and means for regulating the cross-section of the restricted passage of each valve means to change the rate of flow obtained for any given force exerted by the electromagnetic means of the actuator of that valve means.
Claim 10
Dependent Claim
54 words
The flow control described in claim 6 characterized by the actuators for the exhaust control valve means that control the flow of working fluid from the motor being a cylinder-and-piston device with working fluid supplied thereto from the working fluid passage on the downstream side of the valve means operated by the electromagnetic means.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-06 | 1976-08-07 | 1977-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-06 | 1980-08-07 | 1981-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-06 | 1984-08-07 | 1985-02-06 | $7700.00 | Window Closed / Lapsed |