Abstract: A backflow preventer valve including a housing structure having inlet and outlet ports therethrough for attaching to system conduits, a chamber formed in the housing, a pair of spaced valve seats associated with one of the ports including an air space formed between the valve seats, and a movable valve assembly including a first member hingedly attached to the valve housing for movement in the chamber between a closed position adjacent to the valve seats and an open position angularly related to the closed position, and the valve assembly having a clapper portion defined by relatively movable inner and outer members, a flexible valve member including first and second portions and separate members for attaching the flexible valve member respectively to the inner and outer clapper members, the first portion of the flexible valve member being engageable with one of the pair of spaced valve seats in the closed position thereof and the second portion being engageable with the other of the pair of valve seats in th

Abstract: An improved adjustable relief valve is provided having a valve body with a valve body inlet and outlet disposed therein. A reciprocating plunger is disposed in said valve body, and is movable between a first closed position isolating said valve body inlet and outlet, and a second open position communicating said valve body inlet and outlet. A pilot valve means is operatively associated with said plunger to control the flow of fluid from said valve body inlet to said plunger. Both said plunger and said pilot valve means have adjustable spring means for urging them toward their respective closed positions. An auxiliary means is provided for opening said relief valve without varying the adjustments of said spring means, so that said relief valve may be purged with a cleansing fluid.

Abstract: Apparatus and method for applying aspiration, irrigation, medication and ultrasonic power and dwell time to biotissue for surgery and treatment wherein the pressure for both aspirating and irrigating is precisely and accurately maintained by the use of a differential valve and a control reservoir which is generally much larger than the biotissue cavity to be operated on and wherein the pressures for irrigation, aspiration, medication and the application of the amplitude and dwell time of ultrasonic energy can be precisely controlled, externally, to the patient.

Abstract: An improved pressure relief valve for tubeless tires or the like is provided. The pressure relief valve includes a novel poppet valve dust cover structure which will automatically reposition the dust cover after each opening or cycle of the relief valve and which will allow the dust cover to act as a secondary poppet valve surface during venting of the pressurized container in which the valve is mounted to increase the rate of fluid flow through the valve. The valve is designed to be sealingly mounted in an aperture in a wall of the pressurized container and may be mounted therein by means of a threaded connection, a clamp connection, a snap-in connection from the interior of the container or a push-in connection from the exterior of the container. The dust cover is attached to the main poppet valve member for axial movement therewith.

Abstract: A valve assembly having a pair of flow passages in fluid communication with a chamber leading to a tire. One of the passages contains a typical one-way valve core mechanism while the other passage contains a pressure release mechanism. The cross sectional area of the tire inflation passage is less than the cross sectional area of the passage leading from the chamber to the pressure release bore. The exhaust port has a closure means which opens simultaneously with the pressure release mechanism. The closure means offers resistance to escaping inflation fluid which serves to urge the pressure release mechanism open against the biasing force of spring means urging it closed.

Abstract: A hot fluid is directed through a valved conduit inlet. Downstream of the inlet, the conduit divides into a pair of outlets through which the hot fluid flows. The flow through the outlets is controlled by a pair of vertically oriented valves linked together by a V-shaped linkage and weight biased toward the closed position such that when one valve is open the other is closed, and vice versa. The valve actuation means comprises a permanent magnet mounted on the housing in close proximity to each valve; each valve has mounted thereon and exposed to the hot fluid a magnetic material. Thus, when the magnetic material on the open valve is heated above its Curie temperature, the material loses its attraction for the permanent magnet and the weight bias closes that valve and simultaneously moves the other valve close enough to the permanent magnet to be held open thereby. When that valve's magnetic material is heated above the Curie temperature it in turn closes and the other valve opens.

Abstract: A three port, two way check valve is disclosed. It is made of a standard tee and standard flanges attached thereto, typically in conformance with API standards. A flat disc is inserted in one of the openings, the disc incorporating an inernal circular valve seat and a hinged valve member which closes against the disc. A similar apparatus is installed in the center port of the tee. The flapper valve elements are connected together by a connecting rod. The connecting rod assures that when one is pulled closed that the other is pulled open. The connecting rod assures that the check valve function is obtained.

Abstract: Proportioning apparatus comprising a pair of coaxial tubular members with passages having first and second outwardly extending walls of the same cross-sectional configuration, first and second valve bodies for coaction with said walls for progressively opening and closing said passages, said first valve body slidably mounted on one of said tubular members, said second valve body connected to said first valve body for movement therewith and biasing means urging said valve bodies to their closed positions.