Fluid distribution valve

摘要

The distribution valve is located between first (2) and second (3) chambers, and is designed to connect and separate the chambers selectively. The valve has a housing (1) with a sleeve (7) inside its inner cavity (6). The sleeve has a series of apertures (8) connected to a duct (11) which delivers the fluid to the second chamber. A piston (14) slides inside the sleeve to open or close the apertures. The piston divides the housing cavity into a feed chamber (17) linked to the first chamber, and a regulating chamber (18). The piston is controlled by the pressures (Pa,Pt) in the two chambers, and is spring-loaded so that it closes the apertures in the absence of pressure in the feed chamber. The fluid feed duct to the second chamber contains a Venturi tube (24). The regulating chamber is connected to the neck (26) of the Venturi tube through a second duct (28).