GB1070235A - Improvements in and relating to fluid pressure control valves - Google Patents

Abstract

1,070,235. Fluid filters. AUTOMOTIVE PRODUCTS CO. Ltd. Feb. 28, 1964 [Feb. 28, 1963], No. 8106/63. Headings BID and B1T. [Also in Division F2] A fluid pressure control valve for use with two fluid filters 19, 20 arranged to operate in parallel and connectable to a common fluid system for filtering the fluid in the system comprises a valve body 1 adapted to provide a connection between the fluid system and the two filters, a first movable valve member 11 arranged in the body in the input to the filters and manually operable from a neutral position to one or other of the two positions to interrupt the flow to one or the other of the said filters and a second movable valve member 8 arranged in the body in the output from the filters, so as to be sensitive to the fluid pressures on this side and be displaceable from the neutral position by a pressure drop in one of said filters to throttle the flow of fluids through said filter and permit an increase in the flow through the other filter. Fluid to be filtered passes through an inlet not shown into a bore 3 and is directed by the valve member 11 through one of the valve seats 6, 7 into one or both of the filters 20, 19. The fluid leaves the filter through valve seat 4 or 5 into a bore 2 containing a ball valve 8 and through outlet 10 back into the fluid system. The piston valve 11 has a groove 14 into which a pin, controlled by a handle fits. By moving the valve onto one of its seats 6 or 7, flow is only permitted through the other filter and the first can be removed for overhaul. The valves are carried on lugs in the bores. In a modification, the piston valve 11 is fitted with lugs and slides in a smooth bore whilst the ball valve 8 is replaced by two valve members urged apart by a compression spring.