Abstract: Exemplary embodiments are directed to vent valves, systems and methods generally involving a valve body that includes a seat retainer, a needle and a seat. The seat includes a bore extending there through and the needle includes a needle stem and a needle head. The seat is disposed inside the seat retainer. The needle stem is disposed inside the bore. The needle is configured to be pulled through the seat to stop flow through the bore. Exemplary embodiments are further directed to a system including a stem return spring mechanism and a solenoid return spring mechanism. A processing device is configured to actuate the solenoid return spring mechanism to permit the stem return spring mechanism to pull the needle through the seat to stop flow through the bore.

Abstract: A Dual Action, Low Head Isolation Valve is a plumbing fitting that will isolate the interior pipes of a house from the exterior temperatures of summer and winter while allowing the passage of gasses through the system for venting. This valve would be installed at the top of the household plumbing drainage system, or the top vent, in the attic or above the roof. This valve will allow for the system to draw in air and exhaust the septic gasses, or respirate in both directions with very low head or resistance.

Abstract: An adjustable moment arm flapper including a flapper defining a cavity there within and a moveable mass system disposed within the cavity, a center of mass of the flapper changeable based upon position of the movable mass and a method for dynamically controlling a flapper.

Abstract: A fuel distributor valve (19) of a type suitable for use in the fuel supply system of a gas turbine engine is disclosed. The valve comprises: a valve body (22) through which a bore (24) extends between a fuel inlet (22) and a fuel outlet (23); a first valve seat (28) and associated valve member (30) provided across the bore (24), the first valve seat (28) defining at least one fuel-flow-port (26) and the valve member (30) being moveable between a closed position in which it substantially seals against the first valve seat (28) to close the or each fuel-flow-port (26) and an open position in which it is spaced from the first valve seat (28) to permit the flow of fuel through the or each fuel-flow-port (26) in a direction flowing from the fuel inlet (22) towards the fuel outlet (23).

Abstract: A rain hat device for heavy construction equipment which is installed adjacent to an exhaust gas discharging port of a distal end portion of an exhaust pipe to prevent inflow of rainwater therein is disclosed. The rain hat device comprises a swing cover installed at a distal end portion of the exhaust pipe in a spaced and floated state so as to prevent rainwater from flowing in the distal end portion of the exhaust pipe, and in which the swing cover does not come into contact with the distal end portion of the exhaust pipe to prevent noise from being generated due to contact and collision when an engine stops or exhaust gas is not discharged.

Abstract: Disclosed is a system used to increase the wear life of ball and seat valves and of ball and seat valves utilizing a piston mechanism to unseat the ball from the seat, which during operation, create turbulent flow within the valve preventing sand and other wear causing debris from collecting on and prematurely wearing pump components. Also disclosed is a wear and alignment bushing for ball and seat valves utilizing a piston to unseat the ball which reduces stress on the piston actuator.

Abstract: A single-lever tap closable by a load added thereon after pulling up a knob, wherein, the knob is provided with a pivot connector pivotally provided on the top of a main body and is coupled to an output valve, a force exertion portion is formed by extending of the pivot connector forwardly. When the knob is pulled up, by coupling of the pivot connector to the output valve, the tap is opened, and when it restores to the original position, the tap is closed.

Abstract: A flow control has a rotary gate residing within an internal flow space in a conduit. The gate is mounted for movement relative to the conduit between first and second positions, the gate in the first and second positions accounting for a different flow rate between first and second fluid masses between which the gate resides. The gate has an actuator with a plurality of spaced shoulders. A flexible force-applying member is connected to the actuator and bears upon the shoulders to thereby urge the gate towards the other of the first and second positions. The shoulders are situated so that the number of shoulders engaged by the force-applying member at any one time is not the same as the gate moves from the one of the first and second positions towards the other of the first and second positions.

Abstract: A valve comprises a valve body extending vertically, provided with an inlet conduit and an outlet conduit, at the interior of which there is located a suitable weighted shutter arranged for sliding in a guided manner between opening and closing positions for said conduits and to divide said valve body in an upper plenum chamber communicating with the sucking side of a pump and in a lower plenum chamber communicating with the delivery side of said pump.

Abstract: A flapper valve assembly includes a frangible valve closure member which is supported by an elastomeric hinge. The frangible valve closure member is a tempered glass plate, and the hinge is a block of elastomer material which is secured to the glass plate by a molecular bond. In one embodiment, the hinge includes an integrally formed elastomeric jacket which partially encapsulates the glass sealing element and is bonded thereto. In one arrangement, a fluid seal is provided by a resilient, elastomeric seal which is received within a valve pocket, and which is engaged directly by the glass plate. In another arrangement, an annular valve seat is formed in a valve housing sub, with the fluid seal being provided by the elastomeric jacket which is fitted about the glass closure plate.

Abstract: Several embodiments of marine propulsion exhaust systems including water lock devices for precluding the entry of water into the engine through its exhaust ports. In each embodiment, the water lock device comprises a control valve that has flow openings for permitting the flow of exhaust gases through the control valve even when the control valve is in its closed position. The flow openings are, however, positioned so as to prevent the flow of water into the engine under these conditions. The openings also create different effective areas so that exhaust pressure tends to open the valve and water pressure tends to close the valve.

Abstract: A positive displacement pump type fluid dispensing system for viscous fluids in upright-open ended cylindrical containers. The system comprises a base adapted to receive and substantially center the container, a ram plate which is carried by a vertical elevator system to be thrust into the container to apply pressure to the fluid therein and a system of one or more air-operated positive displacement pumps which act through the ram plate to move fluid from the container. The ram plate is loosely mounted on the depending support structure so as to be displaceable relative to the support structure and the base and the container to accommodate axial misalignments. An edge seal having a cam surface on the edge of the ram plate assists in the alignment function and also provides a fluid pressure seal. Gravity operated valves are mounted on the ram plate to admit air to the container when the ram plate is withdrawn.

Abstract: A relief valve assembly for pressure cookers in which the valve port is controlled by a predetermined weight. A skirt portion forming part of the mass of the weight surrounds the valve port so forming a chamber. The skirt portion has an opening in it such that gas entering the chamber from the pressure cooker via the valve port can escape to the atmosphere in a predetemined direction, e.g. away from a hand grip portion.

Abstract: A fail-closed gas safety valve system for blast furnace stove operations employing two tight seal butterfly valves, one a gas shutoff valve and the other a gas regulating valve, which together operate to prevent the leakage of hazardous gas into a blast furnace stove area in the event the supply of air to the stove is interrupted because of a power or a hydraulic failure.

Abstract: A valve (22) is provided in the exhaust system of a marine engine (11) which discharges its exhaust underwater. The valve (22) includes a valve member (23) formed of a stainless steel plate (24) and of silicon rubber (29). Holes (28) are provided in the plate (24) to form a mechanical bond with the silicon rubber molded to the plate (24).

Abstract: A compound meter assembly is provided having primary and secondary passageways housing a high flow rate meter and a low flow rate meter, respectively. A composite flow responsive first valve is disposed within the secondary passageway and moves to a substantially closed position when the liquid flow through said passageway is increasing and exceeds a first predetermined rate. Upon substantial closing of the first valve, a substantial momentary pressure impulse is created and the liquid flow is diverted from the secondary passageway to the primary passageway.

Abstract: A flow regulator for air ducting comprises a flap which can be rotated about a shaft against the action of a spring, by the air current, to regulate air flow therepast. The flap has two portions which are disposed at an obtuse angle to each other about a bend line, one of the portions, in an open condition of the regulator, being directed downstream of the shaft generally parallel to the ducting axis, and is obliquely oriented in the closed condition and the other portion, in a closed condition of the regulator, is disposed in a plane lying at right angles to the ducting axis, and is obliquely oriented in the open condition. The obtuse angle of the flap portions is preferably of the order of 145.degree. to 155.degree..

Abstract: Apparatus for introducing fresh, outside air to a forced air heating or cooling system of buildings comprising a conduit for conducting fresh air to the system, a damper movably mounted in the conduit for adjusting the flow of fresh air therein, and a counterweight adjustably mounted on the damper inside the conduit for movement to selected counterbalancing positions.

Abstract: A well safety valve comprises:A tubing in a well and having a first side port through which well production fluid is flowable,B first means including a valving sleeve movable up and down between predetermined positions on the tubing to control flow of production fluid through said port, said means having surfaces exposed upwardly and downwardly to said flow and characterized in that the upward force exerted by said flow on said means is substantially equal to the downward force exerted by said flow on said means,C said means having a control surface to receive selective application of control fluid pressure for moving the sleeve valve in one direction between said positions.