Valve system having a deadman controlled actuating member in a vented chamber
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United States of America Patent
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Sep 28, 1999
Grant Date -
N/A
app pub date -
Dec 12, 1997
filing date -
Dec 12, 1997
priority date (Note) -
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status (Latency Note)
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Abstract
A main valve receives fluid at an inlet and transmits the fluid to an outlet. The main valve has a rear face. A surge control servo valve responds to a load sense signal and moves between a closed position and an open position in which the fluid is transmitted from the inlet to the rear face of the main valve, to close the main valve. A deadman control mechanism responds to a pneumatic control signal and actuates the surge control servo to the closed position when the load sense signal is less than a threshold value. The deadman control mechanism includes: a pneumatically operated piston, separate and distinct from the surge control servo, and a member connected to the piston for engaging the surge control servo within an atmospherically vented chamber. Also, a bypass valve system comprises a main valve for receiving fluid at an inlet and transmitting the fluid to tank. A pressure control valve mechanism is coupled to receive a load sense signal for controlling the pressure of the fluid on the rear face of the main valve. A deadman control mechanism responds to a pneumatic control signal and actuates the pressure control valve mechanism to the closed position to close the main valve when the load sense signal is less than a threshold value. The deadman control mechanism includes: a pneumatically operated piston, separate and distinct from the pressure control valve mechanism, and a member connected to the piston for engaging the pressure control valve mechanism.
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