Rotary valve

F - Mech Eng,Light,Heat,Weapons – 16 – K

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137/56

F16K 11/00 (2006.01) F16K 11/074 (2006.01)

Patent

CA 1072857

ABSTRACT OF THE DISCLOSURE A rotary valve having a valve body with a rotatable valve member in the form of a port plate rotatably positioned therein for causing free flow from pump to reservoir in a neutral position and having other operative positions for directing fluid to and from the valve. Passage means in the valve body have check valves providing free flow from a control port to an operative member, such as a cylinder, and for holding of pressure on the cylinder when the valve is returned to neutral position. The valve includes seat seal members positioned within flow passages in the valve body and engageable with the valve member and which are formed with opposed surfaces having a differential area whereby forces resulting from fluid pressure urge the seat seal members against the valve member. passage 31, with the latter passage connecting to the secondary chamber 35 because of removal of the plug 48 and the check valve 50 whereby the pump is connected to tank. Fluid returns from the cylinder through control port 38 to the control passage 36 which, in this position of the rotary valve member 60, has the notch passage 71 in overlying relation therewith whereby there is flow to tank through the annular groove 75. 11.

280807

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