A pressure reducing valve (IOO) includes a displaceable throttling element (51) displaceable between a fully-open position in which fluid flows along a flow path from an inlet (11) to an outlet (45), and a closed position in which the flow path is blocked. A spring (6) acts to displace the displaceable throttling element to the fully-open position while pressure within a control chamber (54) acts on a pressure-actuated surface to displace the displaceable throttling element towards the closed position. A switchable hydraulic control circuit in fluid connection with the inlet, the outlet and the control chamber, is switchable between first state in which a pressure within the control chamber is equalized with the outlet pressure, and a second state in which the pressure within the control chamber is equalized with an inlet pressure.

A multi-stage pressure regulation system, device and associated methodology for reducing the pressure of gas passing through a gas sample conditioning system. The device and method allow for automatic and/or manual configuration settings for regulating different types of gas having different profiles while still avoiding dew point dropout thereby ensuring accurate sample analysis at a downstream analyzer. The pressure regulating device includes a housing having a core, a vapor sample input port, a plurality of openings on an upper surface, a plurality of pressure regulating valves configured to reduce the pressure of a vapor sample, and an assembly having a base and substantially central stem orthogonal to the base and extending axially therefrom, the stem being disposed within the core.

A pressure regulating and pressure relief valve, has a valve body defining an inlet port, outlet port, valve seat and pressure relief opening. A pressure regulating plug is displaced during a first portion of a motion from an open position, which provides a continuous flow path from the inlet port to the outlet port, to a closed position in which the plug is closed against the valve seat to obstruct the continuous flow path. A spring biases the plug to the open position. An actuation surface is exposed to a pressure at the outlet port that displaces the plug against the spring bias toward the closed position. Further displacement of the plug beyond the closed position during a second portion of the motion that is beyond a range of the first portion of the motion, opens a relief flow path from the outlet port through the pressure release opening.

A pressure regulator includes a downstream body delimiting a low pressure chamber; an upstream body delimiting a high pressure chamber and carrying an expansion seat; a movable piston having an inner channel having an upper end forming a discharging seat and a lower end opening onto an intermediate chamber connected to a leakage circuit; a tubular valve rod passing through the inner channel of the piston and an inner channel of the upstream body, having an upper end forming a discharging valve and a lower end forming a regulating flap suitable for bearing on the expansion seat; a first biasing member compressed between the piston and the upstream body by biasing the piston towards the downstream body; and a second biasing member compressed between the piston and a plate secured to the valve rod, biasing the rod in the direction of pressing the discharging valve against the discharging seat.

A pressure reducing valve includes a piston disposed in a cylinder chamber; a valve element that is coupled to the piston and opens and closes a valve seat; a valve spring that biases the valve element in a direction in which the valve element is moved away from the valve seat; and a biasing member that biases the valve seat toward a side opposite to the piston. The pressure reducing valve is configured to reduce a primary pressure of a fluid to a secondary pressure. The valve seat is disposed such that the valve seat reciprocates in the same direction as a direction in which the valve element reciprocates in the primary pressure chamber. As a difference between the primary pressure and the secondary pressure increases, the valve seat moves toward the secondary pressure chamber.

Adjustable fluidic oscillators are disclosed. A disclosed example oscillator includes a base having a cavity with a cross-sectional profile defining an oscillatory chamber between an inlet and an outlet of the oscillator, and a plunger to be received by the cavity and movable along a depth of the cavity to vary an aspect ratio of the oscillator.

In a fuel supply device including a regulator and float-type level sensor, a fitting tube is formed integrally with an upper housing, a fuel pump being retained between the upper and lower housings. An outer periphery of a base part of the regulator is fitted into the tube. A regulator retaining member is formed as a separate member from the upper housing and retains the regulator in cooperation with the tube. The tube and the retaining member are joined via a snap-fit join part provided on fitting parts therebetween. The snap-fit join part is formed by engaging a projecting portion or a recess part, formed on an elastic piece provided on one of the fitting parts between the retaining member and the tube, with the recess part or the projecting portion formed on the other fitting part. A sensor support arm is molded as a unit with the retaining member.

A pressure regulator (10) including: a housing (12, 14) including a flow passage (44, 46, 48); a plunger (38) configured to move within the housing, wherein the plunger is hollow and has a plunger passage (46) included in the flow passage; a valve seat (52) in the housing and disposed in the flow passage immediately upstream of an inlet (44) to the plunger passage; a shuttle (42) within the housing configured to move between an upstream-most position at which the shuttle abuts the valve seat to close the flow passage and a downstream position displaced from the valve seat which opens the flow passage; a sealed chamber (26) within the housing and between the plunger and the shuttle, wherein the sealed chamber is configured to be operated at pressures other than at atmospheric pressure; and a port (66) in the housing and open to the sealed chamber, wherein the port is configured to be connected to a source (68) of a pressurized fluid.

A pressure regulating and pressure relief valve, has a valve body defining an inlet port, outlet port, valve seat and pressure relief opening. A pressure regulating plug is displaced during a first portion of a motion from an open position, which provides a continuous flow path from the inlet port to the outlet port, to a closed position in which the plug is closed against the valve seat to obstruct the continuous flow path. A spring biases the plug to the open position. An actuation surface is exposed to a pressure at the outlet port that displaces the plug against the spring bias toward the closed position. Further displacement of the plug beyond the closed position during a second portion of the motion that is beyond a range of the first portion of the motion, opens a relief flow path from the outlet port through the pressure release opening.

A reject valve of a reverse osmosis device, which is especially suited for brackish water reverse osmosis devices, which require a low system pressure less than 15bar. The valve keeps the system pressure substantially constant in a pre-defined range of the reject volume. The size of the inflow channel is adjusted by a spring-operated cone, which never entirely closes the channel, which forms a constant throttle until the pressure of the inflow has risen to approximately three quarters of the pressure arranged by the spring and prevailing at maximum volume of the reject flow. This operation is arranged structurally such that onto the shaft of the cone is fixedly supported a transverse plate abutting the inner wall of the body, which as pressed by the compression spring is supported by the end of an element connected to the end of the body, wherein the cone is in its lowest position.