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 control system having a pressure regulator, first pilot, and second pilot. The pressure regulator has a fluid inlet, fluid outlet, and actuator assembly with a cavity divided into a first chamber in fluid communication with the fluid outlet and a second chamber. The first pilot has a first setpoint and the second pilot has a second setpoint, less than the first setpoint. The first and second pilots fluidly couple the second chamber to the fluid outlet and isolate the second chamber from the fluid inlet in a first mode of operation, isolate the second chamber from the fluid outlet and fluid inlet in a second mode of operation, and fluidly couple the second chamber to the fluid inlet in a third mode of operation.

A pressure reduction plant including two or more valve assemblies arranged in parallel and including: pressure reducers for fuel gas from the supply pressure to the delivery pressure; pilot valves to transmit a control pressure to the pressure reducers when the delivery pressure reaches the calibration value of the pilot valves; derivation conduits to transmit the delivery pressure to the pressure reducers, the pilot valves and the pressure reducer devices; command lines to transmit the control pressure from the pilot valves to the pressure reducers. One of the pilot valves is configured with a calibration value greater than the calibration value of all the remaining pilot valves and each command line is configured to communicate with a control line.

A fluid controller includes a piezoelectric pump, a valve, and a cuff. The valve includes a first valve housing, a diaphragm, and a second valve housing. The second valve housing has a second air hole, a third air hole, and a first valve seat. The second air hole connects to the internal space of the cuff. The third air hole connects to the outside of the fluid controller. The first valve seat is formed around the third air hole. Together, the second valve housing and the diaphragm form a first flow passage. The first flow passage connects the second air hole and the third air hole to each other. The second valve housing has a protruded portion protruding toward the diaphragm and providing a portion of the first flow passage. The shortest distance between the protruded portion and the diaphragm is less than the diameter of the third air hole.

A pressure reducing valve and a method for operating the pressure reducing valve. The pressure reducing valve may be used in a potable water system. The pressure reducing valve can be used for gaseous media and liquid media. Preferably, the pressure reducing valve is intended for use with liquid media, most preferably for potable water.

A system includes a first pressure-adjusting device positioned in a first line and a second pressure-adjusting device positioned in a second line. The first pressure-adjusting device is actuated solely via a first pneumatic signal output from a first pilot valve to control a downstream pressure in the first line. The second pressure-adjusting device is actuated via the first pneumatic signal in a first mode of operation, and is actuated via a second pneumatic signal output from a second pilot valve in a second mode of operation to control a downstream pressure in the second line.

A valve features an outer housing, in which there are provided inlet and outlet channels respectively reaching into the housing from inlet and outlet openings thereof. The two channels are axially closed at adjacent inner ends thereof, but feature perforated circumferential walls. A resiliently expandable sleeve is disposed around the circumferential walls in a position normally overlying the perforations, while leaving a gap between the sleeve and inner surfaces of the housing. A charging port communicates with the gap to enable pressurization thereof. Pressurization of the gap normally holds the sleeve tightly over the perforations to prevent flow from one channel to the other. When pressure in the inlet channel exceeds the pressure in the charging chamber, the sleeve radially expands from the circumferential walls of the channels to uncover the perforations and allow fluid to flow between the channels.

A pilot assembly is configured for use with various types of flow controls. These configurations include a manifold with an internal flow network that connects pilot valves and an adjustable orifice. The pilot valves may have a fixed and variable differential pressure. In one implementation, the manifold comprises a pair of separable blocks, one each that includes part of the internal flow network. This construction also permits the manifold to expand with, for example, and additional block for an additional pilot valve. This feature configures the manifold for use in working monitor systems or those systems that deploy multi-stage pressure regulation.

A pressure regulator is configured for better accuracy and response times at higher inlet pressures. These configurations may integrate two-path control with a pressure-balanced plug. The two-path control may leverage a pair of pilot valves, one with a fixed differential pressure and the other with a variable differential pressure. In one implementation, the device is plumbed so that downstream pressure is sensed at both the actuator and the variable differential pressure pilot valve.

Setting device for a pressure regulator includes a tubular casing developing according to a longitudinal axis (X) and in which there are a movable body, a sliding setting plate and a spring interposed between them; an adjusting unit suited to adjust the position of the setting plate and having a first rotating shaft connected to the setting plate through a screw mechanism which converts opposite rotations of the first shaft into corresponding opposite movements of the setting plate along the longitudinal axis (X), and an electric motor powered by a control device and provided with a second shaft constrained to the first shaft. The control device includes two different input lines to receive corresponding electric signals and an output line to supply power to the electric motor and is configured to transmit an electric pulse emitted by any of the input lines to the output line with polarity depending on the input line which emitted the electric pulse.