Control device for cylinder

Details Control device for cylinder Control device for cylinder

1990-03-26

1991-09-17

Look, Edward K.

Motors: expansible chamber type

With motive fluid valve

Relatively movable serial valves

91445, 91451, 91459, 91461, F15B 1108, F15B 13044

Patent

active

050483951

ABSTRACT:
A control device for a cylinder including a spool type valve which includes a spool and is formed therein with a cylinder port. In the spool type valve is arranged an operation check valve for permitting only flowing of fluid to the cylinder. An orifice is formed so as to communicate a pilot chamber of the operation check valve and the cylinder port with each other. The spool is formed with a first control port and a second control port for selectively carrying out communication between the pilot chamber and the return passage. Thus, when the spool is moved to communicate the first control port with the pilot port, the pilot chamber is communicated with the return passage. This causes fluid to flow through the orifice to lead to a difference in pressure between both sides of the orifice, resulting in a poppet of the operation check valve being opened.

REFERENCES:
patent: 4955461 (1990-09-01), Keir

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