Abstract: The present invention shows a cartridge-type, compensating relief valve for use in a manifold cavity is disclosed. The valve comprises a gland removably secured within the manifold cavity, and having a circular valve seat and a central cavity therethrough. The valve also comprises a valve stem extending through the central cavity and moveable between an open and a closed position. The valve stem has a piston portion extending into the manifold cavity and piston ports extending from the outward face to the inward face of the piston. The piston ports diverge radially from a central point on the outward face of the piston to points around the circumference of the inward face. The valve is also provided with at least one internal fluid chamber in direct pressure communication with the entry port of the cavity, which permits fluid pressure to be directed against at least one internal surface of said valve stem, exerting a force tending to hold the valve in an open position.

Abstract: A simplified two-piece, cartridge-type hydraulic valve provides increased valve seat area and improved hydrodynamics. The present valve is a plug-type valve in which the piston is integral with the valve stem, and the valve seat is inserted into the base at the bottom end of the gland. The stem is threadably fitted into the center of the gland, whereby turning the top of the stem moves the piston reciprocally between open and closed positions. Fluid flow enters through ports in the base of the piston and is directed upward past the valve seat area at the top of the piston. The piston ports are radially divergent from a center point at the bottom end of the piston to points around the circumference of the top end of the piston in the area of the valve seat. A tapered nose piece is included in the bottom of the gland in the center of the valve seat area in order to improve flow efficiency and reduce turbulence.

Abstract: The present invention shows an improved cartridge-within-a-cavity, one-way check valve for use in a high-pressure, high-temperature pneumatic environment. The check valve has a body with a valve portion having an annular cavity extending through one end thereof. The valve portion is provided with a plurality of radial openings. Within the annular cavity a plunger and compression means are provided which close off the radial openings. Pressurized fluid flow into the annular cavity will force the plunger back into the central annular cavity against the compression means allowing one-way flow through the radial openings. Within the annular cavity a plunger and compression means are provided which close off the radial openings. Pressurized fluid flow into the annular cavity will force the plunger back into the central annular cavity against the compression means allowing one-way flow through the radial openings in the valve portion.