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| Number | Title | Issue Date |
| 6655653 | Method and mechanism to reduce flow forces in hydraulic valves A mechanism for controlling forces in a valve assembly such as flow induced forces. The valve assembly comprises a valve body defining first and second flow passages. A valve is movable in the valve body along an axis to control fluid flow between the fir... | 12/02/2003 |
| 6425281 | Pressure insensitive gas control system A pressure insensitive gas process device that includes a gas sensor and restrictions upstream and downstream of the gas sensor. The restrictions result in pressure drops upstream and downstream of the gas sensor which shield the gas sensor from upstream ... | 07/30/2002 |
| 6062530 | Lift valve with pressure balanced pilot operated valve member A valve device comprising a first fluid port, a second fluid port, a valve seat and a valve member having a control chamber is formed at least in part by the valve member. A first passageway communicates between the control chamber and a first port and a ... | 05/16/2000 |
| 6029945 | Self-closing valve A self-closing valve assembly has a main valve having a seat between a high-pressure input conduit and a low-pressure output conduit, a main valve element movable into and out of engagement with the seat to block and permit flow from the input conduit to ... | 02/29/2000 |
| 5853524 | Pneumatic circuit for strapping tool having adjustable tension control A strapping tool has a timing control circuit incorporated therein which comprises a first pressure-operable valve for time-controlling a plastic strap welding operation, and a second pressure-operable valve for restricting fluid line flow from a source o... | 12/29/1998 |
| 5769386 | Electromagnetic proportional pressure control valve An electromagnetic proportional pressure control valve includes a housing having at least one fluid inlet port and fluid outlet port and a passage for communicating between the ports. A spool is slidably accommodated in the housing for opening and closing... | 06/23/1998 |
| 5564673 | Pilot-operated hydraulic valve A pilot-operated hydraulic pressure relief valve (HV) includes a main valve element (5) which is biased into a closed position by a spring (6). A pilot valve (VV1) has an open condition and a closed condition. A relief device (EV) is actuatable by the pil... | 10/15/1996 |
| 5169480 | Time-control circuit for pneumatically operable devices A timing control circuit for a pneumatically-operable device, which is manually actuable so as to provide fluid flow to a revervoir through means of a variable flow control valve and a line-pressure-operable, normally-open valve disposed within the primar... | 12/08/1992 |
| 4611628 | Attenuator valve for a pressure-gas conduit A sealing valve either blocks or releases the gas held under pressure in a gas cylinder, for example. When the sealing valve is opened, the flow path is opened and a pressure impact travels to the equipment connected downstream of the valve and can cause ... | 09/16/1986 |
| 4519574 | Auxiliary controlled valve disposed in a drilling string An auxiliary controlled valve including a valve body (8) displaceable against a valve seat (9) disposed in a drilling string (6) to produce pressure pulses in drilling fluid renders possible a selective closing or opening of a low-resistance transmission ... | 05/28/1985 |
| 4493473 | Valve arrangement "A poppet valve assembly includes a valving element in the form of a freely slidable poppet, a freely slidable pilot piston having an elongated integral pin extending axially toward the poppet, but unconnected thereto, and an integral elongated spear, wit... | 01/15/1985 |
| 4462426 | Valve arrangement A poppet valve assembly includes a valving element in the form of a freely slidable poppet, a freely slidable pilot piston having an elongated integral pin extending axially toward the poppet, but unconnected thereto, and an integral elongated spear, with... | 07/31/1984 |
