Selective control valve system with float

F - Mech Eng,Light,Heat,Weapons – 15 – B

Patent

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Details

F15B 9/08 (2006.01) F15B 11/00 (2006.01) F15B 11/024 (2006.01) F15B 13/02 (2006.01)

Patent

CA 2119616

A pilot operated directional control valve communicates fluid between a hydraulic actuator, a pump and a reservoir. A lockout valve is connected between each main control valve work port and a corresponding cylinder port, and operates to reduce fluid leakage therefrom. Each lockout valve includes a pressure responsive poppet valve member which is exposed to fluid pressure in a lockout chamber. A vent control valve is connected between each lockout valve and a corresponding one of the pilot valves. Each vent control valve includes a vent check valve which controls fluid venting from the lockout chamber and a vent piston which is biased to urge the vent check valve to a closed position thereby trapping fluid in the lockout chamber. When both pilot valves are energized, both lockout valves are vented and a float valve moves to a position wherein both cylinder ports are communicated, via the lockout valves and the float valve, with each other and with the reservoir. The float function is obtained without the requirement of additional solenoids or by compromising the available modulation range of the main control valve.

Hydrovalve de distribution permettant le passage d'un fluide entre un actionneur hydraulique, une pompe et un réservoir. Une soupape d'interdiction servant à limiter les fuites est interposée entre chacun des orifices de soupape de commande principale et le cylindre correspondant. Chaque soupape d'interdiction comporte un clapet de sûreté soumis à l'action de la pression du fluide dans une chambre d'isolement. Un clapet de commande de ventilation est monté entre chacune des soupapes d'interdiction et les organes de robinetterie associés. Chaque clapet de commande de ventilation comporte un clapet qui régit le passage du fluide s'échappant de la chambre d'isolement et un piston de ventilation commandé par ressort pour maintenir le clapet en position fermée et contenir ainsi le fluide à l'intérieur de la chambre d'isolation. Lorsque les deux hydrovalves de distribution sont actionnées, les deux soupapes d'interdiction sont ouvertes et une valve à flotteur se met dans une position dans laquelle les deux orifices des cylindres sont mis en communication entre eux ainsi qu'avec le réservoir, par l'intermédiaire des soupapes d'interdiction et de la valve à flotteur. La fonction de flotteur est obtenue sans l'utilisation de solénoïdes additionnels et sans compromettre la plage de modulation de la soupape de commande principale.

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