Fluid handling – Self-proportioning or correlating systems – Self-controlled branched flow systems
Patent
1997-12-12
1999-09-28
Ferensic, Denise L.
Fluid handling
Self-proportioning or correlating systems
Self-controlled branched flow systems
13711523, 13711518, 1374895, 251 29, 251 26, G05D 1100
Patent
active
059571489
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.
REFERENCES:
patent: 2291783 (1942-08-01), Baak
patent: 3089512 (1963-05-01), Julien
patent: 3570542 (1971-03-01), Otto
Farid Ramyar
Ferensic Denise L.
General Transervice, Inc.
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