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| Number | Title | Issue Date |
| 7165569 | Safety shut-off device The invention relates to a safety shut-off device for sections of fluid circuits, which in case of damage or the like, have to shut off from each other on safety considerations. The safety shut-off device includes two chambers with connections for the sections to be... | 01/23/2007 |
| 7077148 | Redundant valve system The redundant valve system 10 of the preferred embodiments includes a first valve unit 12, a second valve unit 14, a third valve unit 16, a first diagnostic device 18, a second diagnostic device 20, and a control unit 22 | 07/18/2006 |
| 7011289 | Valve A sliding spool valve (1) is provided for controlling flow of fluid especially between an inlet (2) at a relatively high pressure and an outlet (6) at a relatively low pressure. Wherein the spool valve is reciprocally displaced between open and ... | 03/14/2006 |
| 6988508 | Device and method for the pneumatic control, and regulation of hydraulic fluid flows The invention relates to a pneumatic open- and closed-loop control apparatus (10) for flows of pressure fluid, having one inlet conduit (14), two outlet conduits (16, 18), and one venting conduit (20), and also having a valve piston (9... | 01/24/2006 |
| 6976500 | Valve combination for a fluid circuit with two pressure levels, particularly a combined cooling system/heat pump circuit The invention relates to a valve combination which is characterized in that the valve combination has a passive valve and an active valve. The active valve is provided with means for an active influence of the control position of a closing element and regulates the ... | 12/20/2005 |
| 6878293 | Automatic valve assembly for water circulation systems A filtration and backwash system for a water source such as a swimming pool is provided including a fluid source, a pump, a filter and a specially designed five-port valve which is easily adaptable for automatic use in the filtration mode and in the backwash mode. T... | 04/12/2005 |
| 6782910 | Multi-function hydraulic valve assembly A hydraulic valve assembly for selectably delivering hydraulic fluid from a supply of hydraulic fluid to one of a first hydraulic operator and a second hydraulic operator is disclosed. The assembly includes first and second supply ports which communicate with the su... | 08/31/2004 |
| 6745789 | Valve unit with an overridable check valve and a fluid power drive fitted therewith A valve unit having an overridable check valve. On a valve housing a first and a second power connection are provided, which are connected by way of a power duct, on which an overridable check valve is placed, which may be overridden by a fluid control signal, such ... | 06/08/2004 |
| 6422834 | Reversing valve for a diaphragm pump A valve arrangement including a valve housing (10) which includes an inlet port (11) and two outlet ports (12, 13) for fluid flowing through the housing. A valve element (15) is accommodated in a first valve space in the valve housing and movable between ... | 07/23/2002 |
| 6419463 | Reversing valve for a diaphragm pump A valve housing (10) includes an inlet port (11) and two outlet ports (12, 13) for fluid passing through the housing. A valve element (15) accommodated in the valve housing is moveable freely between two end positions and has two surfaces (16) each adapte... | 07/16/2002 |
| 6371156 | No-bleed pilot for pressure regulating valve A control valve assembly including a no-bleed pilot valve is disclosed. The pilot valve includes a pressure responsive valve adapted to move in connection with a control parameter, such as downstream fluid pressure. The pressure responsive valve selective... | 04/16/2002 |
| 6068013 | Counter balance valve In a counter balance valve, a valve body is provided with a valve bore having first and second pump-side ports, first and second motor-side ports and an auxiliary port. A spool is slidably fitted in the valve bore in a longitudinal direction thereof to es... | 05/30/2000 |
| 6065288 | Flow control valve and hydraulic system employing same The hydraulic control system disclosed herein employs a pair of combination poppet/spool valves to control the operation of a hydraulic cylinder driven from a bidirectional pump. Flow introduced through the source port of one valve lifts the poppet of the... | 05/23/2000 |
| 6029689 | Counter balance valve A communication area of a left pressure reception chamber, a pressure reception chamber, a right pressure reception chamber and another pressure reception chamber for moving a spool to first and second positions with a first pump port and a second pump po... | 02/29/2000 |
| 5960814 | Counter balanced locking valve A valve assembly includes a check valve element in the output chamber. The check valve element opens to permit forward flow of fluid under pressure in the output chamber from a source toward a load. The check valve element closes to block back flow of flu... | 10/05/1999 |
| 5875811 | Counterbalance valve with improved relief pressure setting arrangement In order to achieve repeatable, consistent operation of a counterbalance valve, a poppet valve element within the valve has a radial bore therein in communication with a control fluid port and an axial bore therein which receives a rod that is anchored to... | 03/02/1999 |
| 5862828 | Oscillating valve for a double acting operating cylinder For the oscillating triggering of a double acting operating cylinder (4), a reversing valve (6) has been provided and has been inserted between the pressure supply connector (5) and the two operating cylinder drive connectors (2,3) that is driven via two ... | 01/26/1999 |
| 5791143 | Flow control valve and hydraulic system employing same The hydraulic control system disclosed herein employs a pair of combination poppet/spool valves to control the operation of a hydraulic cylinder driven from a bidirectional pump. Flow introduced through the source port of one valve lifts the poppet of the... | 08/11/1998 |
| 5749390 | Valve having four connection ports and two positions A valve includes a distributor with four ports and two positions. In a first position, a first non-return valve allows only circulation of a fluid from the first port toward the third port, while the second port and the fourth port are directly in communi... | 05/12/1998 |
| 5676169 | Counterbalance valve The hydraulic counterbalance valve has a valve body with an inlet port, a cylinder port and a pilot port. The valve body has an interior chamber extending through the valve body which forms a check seat where the interior chamber narrows. The interior cha... | 10/14/1997 |
| 5579676 | Hydraulic valve to maintain control in fluid-loss condition A hydraulic fluid-loss control valve for preventing uncontrolled load movement in the event of a fluid loss such as from the bursting of a hose and further for allowing an operator to move the load in a controlled way despite the fluid loss. The control v... | 12/03/1996 |
| 5535773 | Hydromechanical differentiating apparatus A hydromechanical differentiating system for actuator dynamic stiffness enhancement and dynamic load damping. A free floating spool valve receives a pressure signal and moves in opposite directions away from a null position. When the valve moves in respon... | 07/16/1996 |
| 5481871 | Hydraulic steering system with spool pressure equalization A lock valve apparatus and a hydraulic system incorporating a lock valve apparatus including a lock valve body with a bore, a first port, a second port, a third port and a fourth port. There is a spool valve with a valve spool reciprocatingly received in ... | 01/09/1996 |
| 5468127 | Pilot control valve having means for recovering exhaust fluids A pilot control relay valve to change the directional flow of fluid to a piston (such as, for example, the piston of a chemical injection pump for injecting chemicals at a slow or rapid rate over a long period of time), but also allow the recovery of exha... | 11/21/1995 |
| 5444979 | Fluid passage control device for fluid pressure actuator A tilt cylinder for tilting an outboard engine has first and second cylinder chambers. A pair of on/off valves is movably disposed in respective fluid passages connected to a hydraulic pump and the first and second cylinder chambers, respectively. The on/... | 08/29/1995 |
| 5400816 | Pilot actuated override mechanism for holding valve A holding valve for use in a hydraulic operating system of a machine which is adapted to perform both lifting and digging functions is disclosed. The holding valve includes a conventional poppet assembly for modulating the rate at which hydraulic fluid fl... | 03/28/1995 |
| 5349818 | Low deadband marine hydraulic steering system A lock valve for marine hydraulic steering systems includes a valve body with a spool valve reciprocatingly received in a bore therein. A first port and a second port of the valve are connected to a manual pump. A third port and fourth port are connected ... | 09/27/1994 |
| 5309936 | Poppet configuration for counterbalance valve A counterbalance valve has a first port connected to a hydraulic cylinder and a second port connected to a four-way controller, such as a four-way control valve. Disposed between the ports is a poppet biased to a closed position. The poppet opens to allow... | 05/10/1994 |
| 5183071 | Counterbalance valve A counterbalance valve including a spool (62) divided into two spool pieces (63, 64) at its axial center, return springs (71, 72) for urging the spool pieces inwardly along the axial direction toward their innermost positions, a first passage (90) for int... | 02/02/1993 |
| 5174322 | Automatic two-position four-way pulsating valve A four-way hydraulic control valve automatically reverses flow of hydraulic fluid to a double acting hydraulic cylinder or to a reversible hydraulic motor when a substantial resistance to fluid flow is encountered, such as when the cylinder or a machine b... | 12/29/1992 |
| 5113894 | Counterbalance valve A counterbalance valve for use in drive oil hydraulic circuitry of an oil hydraulic motor is constructed so that an oil hydraulic motor can slow down without shock, while cavitation is prevented, thus coming to rest in a short period time. A spool (26) is... | 05/19/1992 |
| 5018935 | Automatic pressure relief system for a hydraulic motor A check valve assembly having first and second check valves and an unseating spool is positioned between a control valve and a rotary motor. The unseating spool is elongated so that it continually contacts the valve elements of the check valves. The check... | 05/28/1991 |
| 4953579 | Quick acting diversion valves A quick acting diversion valve can be constructed so that a pressure difference between the sides of a bistable diaphragm can be used to cause the diaphragm to change in configuration so as to move a valve body in a housing in order to change the manner i... | 09/04/1990 |
| 4914913 | Load responsive flow amplified control system for power steering Flow amplified control systems are useful in pilot operated steering systems. The load responsive flow amplified control system includes a directional control valve movable to an operating position to direct fluid from the operating fluid circuit through ... | 04/10/1990 |
| 4809549 | Apparatus for metering, measuring, or dosing flowing media An apparatus for metering, measuring, or dosing flowing media. A distribution slide valve is disposed in a housing between an inlet and an outlet. A metering piston is disposed in a chamber of the housing and divides the chamber into a first and a second ... | 03/07/1989 |
| 4796656 | Method and apparatus for causing a series of mechanical actions A feedback type of diversion valve which can be used to sequentially "operate" or "activate" fluid responive structures such as tubes of a pillow.... | 01/10/1989 |
| 4776773 | Pilot control valve for controlling the pumping rate of an injection pump A pilot control valve comprising an elongated valve member shiftable within a valve body between a first and a second position. The first position allows communication of control fluid to a first pressure receiving surface to initiate movement of the valv... | 10/11/1988 |
| 4749055 | Power steering assembly for a large vehicle A power steering assembly for a large vehicle including a primary booster, an auxiliary booster, a primary hydraulic oil pipe adapted to connect the primary booster to the hydraulic pump, an auxiliary hydraulic oil pipe branched off from the primary hydra... | 06/07/1988 |
| 4669494 | Hydraulic lock valve with partial return to tank for marine steering A hydraulic lock valve assembly (10) includes a valve body (16) having an axially extending main bore (18) and first and second axially spaced pump ports (20, 22). A tank passage (23) is in communication with said main bore (18) and first and second valve... | 06/02/1987 |
| 4638924 | Self mixing sprayer A sprayer mixes water and concentrate on an "as-used" basis. A preselected amount of concentrate is dispensed into a mix tank for each reciprocation of a proportioning pump set. The amount of concentrate dispensed is selected by varying the pump set strok... | 01/27/1987 |
