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| Number | Title | Issue Date |
| 6173730 | Charging and bleed value A valve (60) for use in a brake system (10) through which a source (32) of fluid charges an accumulator (24) to a desired fluid pressure level and through which fluid pressure present in a conduit (52) is communicated to a reservoir (33) in the absence of... | 01/16/2001 |
| 5755251 | Full flow pressure trap unloader valve An unloader valve for a high pressure pumping system is disclosed. The unloader valve diverts fluid back to the pump inlet when the discharge line is blocked, and directs flow to the pump outlet when the line is unblocked. The unloader valve includes a va... | 05/26/1998 |
| 4512358 | Compact long-life by-pass and pressure unloader valve An unloader valve in which the valve body has an inlet opening between an outlet opening and a by-pass opening and in which the flow of fluid is controlled by two valves, both of which open and close in relation to a single unitary plunger. The plunger is... | 04/23/1985 |
| 4105041 | Hydraulic system A hydraulic system suitable for supplying fluid under pressure to the brakes and other elements of an automotive vehicle includes a valve casing formed with a first port, normally connected to a pump, a second port normally connected to a fluid storage ve... | 08/08/1978 |
