Abstract: A back flow preventing device which prevents the reverse flow of water from a point of use into a water supply system. The device has a casting with coaxially aligned inlet and outlet openings, and containing coaxially aligned inlet and outlet check valves. The coaxial alignment of the inlet and outlet openings, and of the inlet and outlet check valves serves to minimize the pressure drop through the device. Between the inlet and outlet check valves is a diaphragm actuated relief valve which opens to drain the passage between the check valves if they should malfunction or if there is a drop in the supply line pressure sufficient to cause actual or potential reverse flow back toward the supply line.

Abstract: A fuel spray bar is disposed in the induction passage of an internal combustion engine for spraying fuel into the induction air stream. The spray bar contains a pair of separate fuel distribution rails designated as the main (or light load) fuel distribution rail and the auxiliary (or power) fuel distribution rail. A plurality of spaced orifices communicate each rail with the induction passage. A pressure regulator assembly is disposed on the fuel spray bar and contains a main pressure relief valve assembly, the outlet of which is in communication with the main fuel distribution rail of the spray bar and an auxiliary pressure relief valve assembly, the outlet of which is in communication with the auxiliary rail. A motor driven control pump delivers fuel to the inlet of the pressure regulator assembly. At idle and light engine loading, only the main valve assembly is open so that fuel is sprayed into the induction air passage solely via the main fuel distribution rail and its orifices.

Abstract: A check valve for a rock drill comprises a valve plate carrying a cylindrical strainer. An insert is carried by the valve plate and is movable between valve-open and valve-closed positions. A spring biases the insert to a valve-closed position. The insert unit includes a lid which engages and covers the top of the strainer in a valve-open position, and a bottom plate which covers the valve plate in a valve-closed position to prevent cuttings from fouling the valve mechanism.

Abstract: A hydraulically limited fuel injection nozzle includes a lift control washer disposed about an elongated check valve stem so that the washer cooperates with a surrounding sleeve when acted upon by a pressure difference caused by fluid flow to control lift of the check valve. The arrangement moves the main flow restriction upstream of check valve.

Abstract: A piston and cylinder motion dampening device having spiral groove metering, an orificed two-way pressure relief valve, a screw-on spring and an over-extension seal retainer.

Abstract: Improved check valve adapted for operation under light pressure, as in the oral inflation of inflatable articles. The valve has a valve body and a movable valve element therein, the valve element having a body which carries an annular sealing means cooperating with and selectively sealing an axially outwardly converging valve seat on the valve body, the angle of engagement between the sealing member of the valve element and the valve seat at the valve-closed position of the valve element exceeding the angle of repose of the engaging parts of the sealing member and the valve seat. The sealing member, which is molded in place on the body of the valve element, has an annular main part surrounding an enlarged head on the body of the valve element and a sheet-like disc which is integral with the main part of the sealing member and overlies the axially inner end of the head on the body of the valve element.

Abstract: A catalyst spray nozzle for injecting a finely atomized spray of liquid catalyst into a high pressure chemical reactor such as an autoclave reaction vessel for polymerizing ethylene into polyethylene. The liquid catalyst is fed under pressure to the discharge end of a passageway in the spray nozzle. A valve member is biased closed against the discharge end of the passageway by a biasing spring in the form of belleville washers located entirely within the housing of the nozzle and prevents liquid catalyst from passing therethrough until a given backpressure on the catalyst is established. When the given backpressure is reached, the pressure biases the valve member away from the passagway and the catalyst is forced through at least one discharge orifice under sufficient pressure to cause it to be sprayed in a finely atomized state into the reactor.

Abstract: A back flow preventer valve assembly for protecting fluid supply systems against back flow of contaminating fluids includes a pair of serially connected check valves positioned within respective housings which are connected together and to inlet and outlet fittings by slidable sleeve-type couplings. The couplings are sealed to the fittings and to the valve housings by resilient annular gaskets, preferably O-rings. Tie bolts extend longitudinally from the inlet fitting coupling to the outlet fitting coupling to retain the assembly together. This assembly provides for interchangeability of components, easy removal of the valve units from the line in which they are connected without disconnection of the inlet and outlet fittings, and for easy replacement or substitution of a fitting. Each check valve includes a poppet assembly of advantageous modular construction, with components easily replaceable.

Abstract: A check valve comprising a housing having an annular abutment therein, a spring pressed guide in the abutment, an elastomeric disc on the guide, a conical head with an annular tapering groove facing the disc and a flat apex facing downstream, said guide having fluid passages open upon downstream pressure and the conical head and disc closing and stabilizing the valve upon lack of pressure or reverse pressure.

Abstract: A check valve assembly is disclosed. A hollow valve body is provided with respective upstream and downstream ends. A valve seat is located on the interior of the valve body and has an annular seating surface directed toward the downstream end of the valve body. The seating surface is inclined at an acute angle relative to the centerline of the valve body. A poppet element is provided which has a circumferential surface with a relatively narrow neck proximate the valve seat. The circumferential surface of the poppet element on the downstream side of the neck has a frustoconical configuration. A deformable resilient O-ring circumscribes the poppet element at the neck. The outer diameter of the O-ring is greater than the inner diameter of the annular seating surface of the valve seat so that the flow of fluid through the valve body from the downstream end to the upstream end presses the O-ring against the seating surface to close the valve.

Abstract: An indicator to show that a pressure relief device has operated. The indicator of the invention comprises a flexed spring which is released to move to an upright position when the pressure relief valve is caused to operate.

Abstract: A high efficiency water hammer type pump and more particularly, an improved construction for such a pump including a construction whereby water expelled from a waste valve is returned to the supply line of the pump.

Abstract: A pressure compensation valve arrangement for opening automatically with the occurrence of a pressure difference on opposite sides of a dividing wall including a valve stem having a valve head at one end biassed into sealing relationship against an annular valve seat by a compression valve spring acting at the side of the dividing wall remote from the head and at a flange at the other end of the valve stem. The valve stem at its other end has a hollow cavity and has laterally recessed openings between vertically shaped connecting ribs. The cavity and openings communicate with a passageway bounded by the valve seat when the pressure on the valve stem exceeds a predetermined safety value.

Abstract: A transformer is provided that utilizes a substantially fully integral, generally outwardly convex casing or tank for enclosing an electrical transformer in a dielectric environment. The casing has fully integral side and top and bottom end walls, and has an open portion in its top end wall of sufficient size to serve both as a positive low to high pressure release and a maintenance hand hole. An easily inserted and removed cover assembly employs an operating stem, a domed cover member, a clamping member, a nut carrying bracket member and a spring that may be adjusted to a desired pressure relief setting by rotating the stem in one direction. Rotation of the stem in an opposite direction releases its clamping setting and loosens the parts of the cover assembly in such a manner as to permit it to be easily and quickly removed from the open portion by tilting it with respect to and out of the open portion.

Abstract: An apparatus for stopping the flow of gas under pressure from a relief valve comprises an elongated tube which fits around a flue secured to a tank. The apparatus has means for maintaining the tube in this position. An elongated rod is extended through the tube and secured into a load-transferring position so that it rests on the pressure valve assembly, thus preventing the assembly from opening.The method for sealing off a leaky safety valve has a first step of placing a tube over a flue for a safety valve. This tube has a bar adjustably secured within and generally coaxial with it. The bar is lowered until it sits on the valve head so as to restrain the valve from leaking.

Abstract: This invention relates to the art of pressure vessels and more particularly to a valve assembly for use in a pressure vessel of the type having a rigid container with a deformable bladder therein, dividing the container into two variable volume chambers, one adapted to receive gas under pressure and the other to receive liquid under pressure.The valve assembly which is screwed into a port in communication with the gas chamber includes a slidably mounted stem having a resilient valve member at one end normally urged to seat on the beveled inner end of an axial bore in the valve assembly in a first seating position of the valve member, and urged further into said beveled inner end when the bladder is charged with gas under pressure in a second seating position of the valve member. The inward movement of the valve member is limited by a stop carried by the stem. When the liquid chamber is charged, if the bladder should abut against the resilient valve member, no extrusion of the bladder would occur.