Abstract: Example internal relief valves for use with fluid regulators are described. An example internal relief valve includes a relief valve seat coupled to a first end of the relief valve stem and to engage a first side of a sensing apparatus to prevent fluid flow between the first side of the sensing apparatus and a second side of the sensing apparatus when the internal relief valve is in a closed position. A bleed hole within a surface of the sensing apparatus and separate from the opening of the sensing apparatus is dimensioned to provide a controlled flow rate between the first side and the second side of the sensing apparatus when the internal relief valve is in an open position. A seal is disposed along a body of the relief valve stem upstream from the bleed hole and the valve seat to prevent fluid flow between the first side of the sensing apparatus and the second side of the sensing apparatus via the opening of the sensing apparatus when the relief valve is in the open position.

Abstract: The invention relates to a hydraulic valve device having a fluid connection arrangement (10) and having a displaceable control device (16) for at least partially actuating connections of the fluid connection arrangement (10), wherein the control device (16) can be actuated by two opposing pilot valves and is held in the neutral position thereof by centering springs. By providing at least one throttle position (da1, db1) between each pilot valve and the control device that can be connected for fluid flow between a load probe connection (LFA) and a load indicating connection (LMA) or a load probe connection (LFB), a hydraulic valve device enables fine control for moving loads.

Abstract: A system for hydraulically managing fluid pressure between selected set points includes a pilot control system operably coupled to a main valve. The pilot control system includes at least one fluid conduit, a variable orifice assembly, and a control pilot valve apparatus. Fluid is passed through a fixed orifice and into a first chamber of the control pilot valve apparatus. Fluid is passed through the variable orifice of the variable orifice assembly and into a second chamber of the control pilot valve apparatus. The main valve is hydraulically opened or closed in response to a pressure differential between the first and second chambers of the control pilot valve apparatus so as to manage fluid pressure downstream of the main valve between the selected upper and lower set points.

Abstract: A pressure relief valve includes a lever plate, a first spring, a fitting, and a guide assembly. The fitting has a first side, a second side, and a flange having a rounded end and includes a surface with which a first end of the first spring contacts. The guide assembly has two sides, two concavities, and at least a portion of the guide assembly extends through the opening of the lever plate, the first concavity is formed on the first side of the guide assembly and contacts the fitting flange rounded end, and the second concavity is aligned coaxially with the first concavity. A rounded end of a rod of the diaphragm assembly contacts the second concavity. The second spring is adapted to supply a second force against the diaphragm assembly to move the lever plate in a second direction that is substantially opposite the first direction.

Abstract: A system and method for enabling automated activation of a temperature control shaft of a gas valve includes an electric motor having a motor shaft and integral coupler, wired to a relay control circuit and controlled by a standard electric timer device.

Abstract: A multistage, pilot-operated pressure regulator for pressure adjustment and/or back pressure relief and/or differential pressure or flow control applications comprises a diaphragm and a plurality of plates, including a throttle plate and at least one flow control plate. In at least one embodiment, the throttle plate includes a sloped upper surface for contacting the diaphragm, and a plurality of apertures residing within a plurality of concentric rows. In addition, in at least one embodiment, at least one flow control plate is positioned downstream of the throttle plate, the at least one flow control plate including a plurality of apertures residing within a plurality of concentric rows. A method of controlling the flow of fluid in a conduit is also provided.

Abstract: A control valve includes a main poppet that moves in response to pressure in a primary control chamber and thereby controls the flow of fluid through a valve seat between first and second ports. A passageway extends between the second port and the primary control chamber and includes a variable flow restriction that decreases as the main poppet moves away from the valve seat. An electrohydraulic pilot valve has a pilot poppet which controls fluid flow from the primary control chamber to the first port in response to pressure in a pilot control chamber. A sub-pilot valve selectively releases pressure in the pilot control chamber to operate the pilot poppet to open and close a path between the inlet and the outlet. Using an electrohydraulic pilot valve enables the main poppet to operate quickly in controlling large fluid flow rates. Unidirectional and bidirectional versions of the control valve are described.

Abstract: A fluid control valve for use with apparatus for medical use. Commercially available valves which operate by electrical, hydraulic or pneumatic means are often expensive and bulky. They may require excessive power to operate them and can be noisy during operation due to moving parts and fluid flow through internal pathways. The valve of the present invention has a valve seal (1) mounted between inlet (A) and outlet ports (B), with the seal including a valve closure member (4) operated by means of a control fluid fed through a control port (C) in the valve body. In operation a pressure differential acting to open and close the valve is set up between the inlet and outlet ports and the control port to operate the valve. This design results in cost savings and performance benefits compared with the prior art.

Abstract: A system for hydraulically managing fluid pressure in a fluid distribution system between pressure set points includes a main valve having a fluid inlet and outlet. The main valve is configured to open to increase fluid flow therethrough and to close to reduce the fluid flow therethrough. A variable orifice assembly is coupled to the main valve and has fluid apertures formed in a housing thereof to create a fluid flow pathway therebetween. A valve stem is variably positioned within the housing to alter the fluid flow between the fluid apertures. A first control pilot is in fluid communication with the main valve and a first fluid aperture of the variable orifice assembly. A second control pilot is in fluid communication with the main valve and a second fluid aperture of the variable orifice assembly. The valve position and fluid flow are variable as the main valve opens and closes.

Abstract: An air pulser includes a housing. The interior of the housing is divided into an air supply chamber and an exhaust chamber by a diaphragm formed with an aperture. An air injection tube is provided in the air supply chamber and configured to be selectively opened and closed by the diaphragm. The exhaust chamber is divided into first and second chambers by a valve plate formed with a valve hole. In the second chamber, a guide tube is fixedly mounted in which a valve body is slidably supported. The valve body carries a permanent magnet adapted to be attracted to the valve plate and carrying a suction disk. A seal member is disposed between the guide tube and the valve plate. A plurality of radial grooves having a V-shaped cross-section are formed on the surface of the valve plate facing the suction plate at its radially inner portion.

Abstract: A stepper-motor gas valve control is disclosed that includes a main diaphragm in a chamber that controllably displaces a valve relative to an opening in response to changes in pressure, to adjust fuel flow through the valve. A servo-regulator diaphragm is provided to regulate flow to the main diaphragm, to thereby control the rate of fuel flow. A stepper motor is configured to move in a stepwise manner to displace the servo-regulator diaphragm, to control fluid flow to the main diaphragm. A controller mounted on the stepper-motor regulated gas valve control receives and converts an input control signal from a heating system to a reference value between 0 and 5 volts, and selects a corresponding motor step value. The control responsively moves the stepper-motor in a step wise manner to displace the servo-regulator diaphragm and thereby regulates the rate of fuel flow through the valve.

Abstract: A flow control apparatus for a pressure system includes a chamber, a pump for providing a flow from the chamber and a valve positioned between the chamber and the pump for providing regulation of the flow. The valve is continuously operable between a fully open and a fully closed position. A motor continuously operates the valve between the open and closed positions. The motor includes a position encoder including an encoder output. A sensor continuously monitors the flow and includes a sensor output. A system interface receives the encoder output and the sensor output. The system interface processes the position encoder output to determine position and velocity of the motor and using at least the sensor output, position and velocity produces control signals for the motor. A servo driver receives the control signals from the system interface and continuously controls the motor in a closed-loop manner to regulate the flow.

Abstract: The invention relates to an integrated gas regulating and safety valve for burners of a modulatable gas heating device. According to the invention, the gas regulating and safety valve comprises a housing (1) with two controllable closing elements, the axes of which are spaced apart from each other and extend one behind the other in series in the direction of gas flow between an inlet channel (2) and an outlet channel (4) of the housing. In the de-energized state, the two closing elements abruptly close the gas regulating and safety valve independently of each other, in each case by means of an associated spring element (7, 12). The first closing element, additionally serving for the modulation of the gas stream, has a drive spindle (15.1), which is formed as a spindle of a stepping motor (15), is surrounded by an excitation winding (16) and has placed on its end a restrictor component (8) and, at a distance from that, the first spring element (7).

Abstract: A pressure controller device includes a housing accommodating a precision pressure regulator incorporating a first diaphragm operable upon a main valve provided between an inlet and an outlet in the housing. The regulator further includes a second diaphragm operable upon a flapper-nozzle arrangement to set the pressure of the working fluid discharged through the device. The housing further includes a resiliently loaded shuttle actuable by an operating handle connected thereto and externally protruding from the housing to operate the second diaphragm and the flapper-nozzle arrangement. Manual operation of the handle, and resulting linear movement of the shuttle, effects movement of the second diaphragm and the flapper-nozzle arrangement and thus by pressure fluid to operate the first diaphragm and thus the main valve. Consequential variation in the pressure of the fluid delivered by the device is thus achieved by the shuttle overriding the operation of the diaphragms and thus the valve.

Abstract: Disclosed is a device, method and system for a measurement while producing (MWP) and flow throttling (FTD) device for placement in a pipe with liquid or gas flowing through it such as an oil or gas well's wellhead, casing, tubing, or horizontal or lateral passage which is responsive to the flow of fluid through it. The MWP/FTD device can create pressure pulses through the production fluid or otherwise send signals to provide bit data that are read and analyzed at the wellhead or externally thru wireless communications. The data analysis provides information regarding pressure, fluid flow, and type of fluid/gas flowing primarily within the lateral passages or generally anywhere the MWP/FTD is situated. The device helps identify whether the pipe, lateral or other passage should remain open, closed or restricted.

Abstract: Modulating gas valves and systems for modulating gas flow to gas-fired appliances are disclosed. An illustrative modulating gas valve can include at least one main valve adapted to regulate the flow of gas through a main gas conduit, at least one regulator for regulating the gas pressure outputted by each main valve between a first gas pressure and a second gas pressure, and a modulator adapted to variably modulate the gas outputted by the gas valve at a pressure between the first and second gas pressures. The modulator can be used to modulate the main gas valve or valves between an infinite or discrete number of positions.

Abstract: A hydraulic system for producing a pilot pressure to actuate at least one transmission component of an automatic transmission of a vehicle. A pilot system is connected via an inlet orifice or flow restriction to a supply conduit that is under a predetermined input pressure and that includes a pressure limiting valve for setting a predetermined pilot pressure. At least one inlet orifice or flow restriction is provided in such a way that the resulting flow resistance compensates for a rise in residual pilot pressure at low temperatures.

Abstract: A vibration damper includes a cylinder within which a piston is slidably received thereby defining compression and rebound chambers. The piston has a bore with a valve seat through which fluid flows between those chambers. A poppet selectively engages the valve seat and forms a pilot chamber an opposite side of the poppet from the valve seat. The greater pressure within the compression or rebound chambers is applied by a first logic arrangement to the pilot chamber and a pilot spool control a fluid flow between the pilot chamber and a pressure cavity in the piston body. A second logic arrangement connects the pressure cavity to either the compression and rebound chamber which has the lesser pressure. A solenoid that moves the pilot valve element to control pressure in the pilot chamber and thus the amount that the poppet moves to allow fluid flow through the piston.

Abstract: A fluid regulating device includes a valve disc and a valve port adapted to provide a secondary seal during an obstructed closing operation, whereby the valve disc directly engages a housing component of the valve port to maximize the integrity of the secondary seal and advantageously reduce the size and complexity of existing valve ports. The valve port comprises a housing and a cartridge slidably disposed in the housing. The valve disc directly engages a primary seat carried by the cartridge during a normal closing operation. During an obstructed closing operation, however, the cartridge is pushed into the housing such that the valve disc directly engages a secondary seat carried by the housing at a location that is downstream of the cartridge.

Abstract: Inside a cartridge-type cylindrical casing (40), a meter-out inlet (43), a valve chamber (44), a rod chamber (46), and a meter-out outlet (47) are formed in that order. The rod chamber (46) and the valve chamber (44) are arranged substantially concentrically, and a check valve seat (53) is provided on an inner peripheral surface of a peripheral wall (44a) of the valve chamber (44). A check ball (52) inserted in the valve chamber (44) is urged toward the check valve seat (53) by a spring (54). A throttle valve seat (59) is provided on a leading end portion of an adjusting rod (45) screwed in the rod chamber (46), and a throttle gap (G) is formed between the throttle valve seat (59) and the check ball (52).

Abstract: For adjustment of a desired burner gas-air ratio over the broadest possible load range without additional pressure tapping of the burner, combustion chamber, or air lines, a ratio controller is provided that permits adjustment of the gas flow as a function of counterpressure. For adjustment, the ratio controller has at least one position-variable measurement site, or at least two measurement sites, connected directly or indirectly via a pilot valve, to an actuating diaphragm via a valve block or throttle valve block. Depending on whether the control pressure is picked up more from one or more from the other measurement site, the gas flow and therefore the gas-air ratio can be adjusted to be larger or smaller.

Abstract: An electro-pneumatic air pressure regulator includes a primary pressure introduction port, a secondary pressure output port, a pilot pressure chamber, a main valve for opening and closing a communicating conduit, a floating piston which actuates the main valve, a nozzle conduit via which the pilot pressure chamber is communicatively connected to the atmosphere, a flapper which includes a leaf spring facing an open end of the nozzle conduit, and an electromagnetic drive system which deforms the leaf spring to vary a position of the flapper relative to the open end of the nozzle conduit in accordance with the magnitude of an analogue input signal. The flapper includes a conical projection which projects toward the open end of the nozzle conduit. A conical recess corresponding to the conical projection is formed on an end face of the nozzle conduit around the open end thereof.

Abstract: Arranged in a hydraulic circuit is a valve with an L-shaped duct arrangement, which is formed by a transverse duct 2 and a longitudinal duct 3. Formed in extension of the longitudinal duct 3 is a holding and guiding bore 4, in which a throttling element, comprising a throttle slide 10 and a valve piston 21 that can be displaced therein, can be displaced longitudinally. The valve piston 21 has a passage hole 25, which is connected to the interior of the throttling element and two proportionate annular chambers 17a and 17b. Of these, the proportionate annular chamber 17b is connected to a pilot control valve via a control duct 19. Depending on the direction and pressure of the hydraulic fluid flowing through the L-shaped duct arrangement, the throttling element is moved in or out and extended or compressed in the process.

Abstract: A cartridge relief valve uses a piston design. The piston replaces a tube used in prior art relief valves. The piston makes the inventive relief valve easier to manufacture and more stable than prior art relief valves. This is due to the fact that, for a given size valve, the diameter of the piston is smaller than the diameter of the tube that it replaces. Furthermore, the diameter of the pilot seat of the inventive relief valve is also smaller than the diameter of the pilot seat of many prior art valves.

Abstract: Gas flow control is addressed using a controllable approach that facilitates safe operation. According to an example embodiment, a control arrangement for gas flow comprises two main valves connected in series and two servo valves operated by an actuator, the opening of the main valves being controlled via said servo valves. The main valves are operated by means of diaphragms limiting a first gas chamber, wherein the first servo valve is connected to the first gas chamber of the first main valve, to a second gas chamber in the inlet area of the first main valve and to the first gas chamber of the second main valve. Due to this construction a leakage gas flow out of the first gas chamber of the first main valve leads, if the first servo valve fails, to an increase in pressure in the first gas chamber of the second main valve, whereby it is ensured that the main valve is safely closed.

Abstract: A test fixture for testing directional pilot valves as used in connection with turbine engine thrust reversers, and an associated method of use. In a particular embodiment, the test fixture has a base and at least one support mounted to the base to support the directional pilot valve. At least one fastener permits attachment of the directional pilot valve to the support. An adjustable actuator is also mounted to the base and is capable of stroking the directional pilot valve to simulate valve positions that may be encountered in operation of the valve. The adjustable actuator is also capable of maintaining a force, as set by a technician, against the directional pilot valve.

Abstract: A valve has a housing defining an interior of the valve. The valve has a first passage in the housing and a second passage in the housing. The valve has a flow limiter movable between a first position at which the first passage is in fluid communication with the second passage and a second position at which the first passage is not in fluid communication with the second passage. The valve has a flow restriction device movable between a first position at which a first flow rate is permitted into the interior of the valve and a second position at which a second flow rate is permitted out of the interior of the valve. The first flow rate is greater than the second flow rate.

Abstract: There is provided a pilot valve (50), suitable for use in water and gas supply systems, the valve including biassing means (57), to control a gate (55), for controlling fluid flow through a control chamber (51), and a second chamber (52), which is sealed by a diaphragm (53), the second chamber (52), in use, receiving a control pressure for controlling the operation of the gate (55), such that an increase in control pressure acts to reduce fluid flow through the gate (55). The side of the diaphragm (53), against which the control pressure is not applied, is in fluid communication with the control chamber (51).

Abstract: A fluid flow control valve uses a servo valve to control the pressure in a main diaphragm chamber defined by a main diaphragm. The main diaphragm carries a main valve element that assumes either a low flow or a high flow position relative to a valve seat depending on which of two states the servo valve is in. When the servo valve is in the one of the two states creating the low flow position of the main valve element, the main diaphragm chamber pressure is regulated by a pressure divider comprising two flow restrictors in series connection between the inlet and outlet chambers of the valve. When in the other of the two states, the servo valve disables the pressure divider and allows the main diaphragm chamber pressure to reach the outlet pressure. The disclosure shows two versions of the invention. One version of the valve enters its low flow state when the servo valve is closed, and the other when its servo valve is open.

Abstract: The membrane valve body includes at least two layers of chambers which is configured in the valve body, and at the interior of each said chamber a duct is mounted, out of which covered with the bigger air coupling. A membrane is arranged to separate the chamber from the duct, furthermore, the membrane acts as a valve gate controlling the communication between the duct and the air coupling, in which: a connection air tube is configured at the air couplings directly between the upper and lower chamber. The upper membrane is entirely sealed, when the magnetic valve starts, the upper and lower membrane valve gates may switch on or off simultaneously, to reduce delay phenomena generated during the operation, and effectively abbreviate the mechanism movement time, and firm the valve gate to switch on or off.

Abstract: A gas conversion assembly generally has a gas inlet and a gas outlet. The assembly includes a control mechanism for regulating the flow of gas from the inlet to the outlet. The control mechanism is constructed and arranged to adjust from regulating the flow of a first gas to regulating the flow of a second gas. The control mechanism has an actuator for switching the control mechanism from its first arrangement for regulating a first gas to its second arrangement for regulating a second gas.

Abstract: A flow control valve assembly, and a method of determining and controlling fluid flow through the valve, that is relatively simple in design, is relatively inexpensive, is accurate, and has a relatively wide measurement range. The flow control valve is relatively compact and includes all of the flow measurement and control components in a single, relatively compact assembly. Such components may include a differential pressure sensor, pressure sensor, a temperature sensor, a position sensor, and a processor. The differential pressure sensor senses differential pressure across the variable area flow orifice. The pressure sensor senses fluid pressure within the valve and supplies a fluid pressure signal. The temperature sensor senses fluid temperature and supplies a fluid temperature signal. The position sensor senses the position of the variable area flow orifice and supplies a position signal.

Abstract: The present invention is an intrinsically safe pneumatically actuated flow controller. A preferred embodiment for the flow controller has a housing assembly defining an inlet port, an outlet port, a pressure signal inlet port, and a main flow path extending between the inlet port and the outlet port. A restriction member is arranged in the main flow path. A first valve assembly and second valve assembly control fluid flow along the main flow path. A first regulator assembly operates the first valve assembly. A pressure signal actuation assembly has an actuation bellows attached to an actuation piston mounted on a flow control piston rod that passes through an isolation plate and is sheathed by an isolation bellows. The flow control piston rod terminates in a flow control piston that engages a second regulator assembly, which operates the second valve assembly based on pressure signals transmitted through the pressure signal inlet to the pressure signal actuation assembly.

Abstract: A cartridge relief valve uses a piston design. The piston replaces a tube used in prior art relief valves. The piston makes the inventive relief valve easier to manufacture and more stable than prior art relief valves. This is due to the fact that, for a given size valve, the diameter of the piston is smaller than the diameter of the tube that it replaces. Furthermore, the diameter of the pilot seat of the inventive relief valve is also smaller than the diameter of the pilot seat of many prior art valves.

Abstract: A fluid flow control valve uses a servo valve to control the pressure in a main diaphragm chamber defined by a main diaphragm. The main diaphragm carries a main valve element that assumes either a low flow or a high flow position relative to a valve seat depending on which of two states the servo valve is in. When the servo valve is in the one of the two states creating the low flow position of the main valve element, the main diaphragm chamber pressure is regulated by a pressure divider comprising two flow restrictors in series connection between the inlet and outlet chambers of the valve. When in the other of the two states, the servo valve disables the pressure divider and allows the main diaphragm chamber pressure to reach the outlet pressure. The disclosure shows two versions of the invention. One version of the valve enters its low flow state when the servo valve is closed, and the other when its servo valve is open.

Abstract: The fitting, in particular a safety valve, operates according to the relief principle or according to the loading principle. The fitting is opened and closed by a plurality of control parts. The control parts are connected in series in the control line of the fitting and are each actuated by a control valve. The control parts open the fitting only when all the control parts are in a position which opens the fitting. The fitting closes as soon as even only one of the control parts is in a position which closes the fitting.

Abstract: A pressure limiting valve for a fluid medium under system pressure, with a valve housing, in which are provided an inlet channel and an outlet channel communicating therewith for the medium, wherein the flowrate of the medium can be regulated by an axially movable valve body, in effective connection with an energy accumulator, and interacting with a valve seat, is so configured that a piston coaxially adjoining the valve body bounds with its lateral surface a throttle gap, which communicates with the inlet channel and can be subjected to pressure directly or indirectly by the energy accumulator.

Abstract: A three-stage relay control is provided for regulating the flow of gas through, for example, gas valves. The relay control includes a control arm for providing three levels of gas flow and having three adjustment screws, one for controlling the flow at each stage of operation. The control arm preferably pivotally rotates to provide the three gas flow levels. Energizing the relay control at three different amperage levels provides the three-stages. At a low-flow stage, the relay is de-energized. At a high-flow stage, the relay is fully energized. At a mid-flow stage, between the high-flow and low-flow stage, the relay is energized at an intermediate amperage.

Abstract: A hydraulic control circuit, comprising a control line connected to a device to be controlled by fluid pressure in the control line; a time-out valve on the control line, the time-out valve having a time-out period during which time-out period operation of the time-out valve is delayed after actuation of the time-out valve; a pump connected to the control line for pressurizing the control line with fluid; and an arming valve operated by pressure on an arming line connected to the control line and the arming valve being connected to the time-out valve to reduce the time-out period in response to pressure on the control line.

Abstract: There is described a demand valve for a breathing apparatus wherein a pilot jet of the demand valve is controlled by a pivoting lever resiliently held against a planar face in which the pilot jet is formed. The pilot jet is preferably formed in a land surface surrounded by a recessed area of the planar face, and opening of the pilot jet is effected by movement of a control projection mounted on the pivoting lever. The area of the control projection is preferably greater than the area of the land surface.

Abstract: The invention relates to a vacuum regulator (1) for maintaining a substantially constant vacuum in a vacuum system (2). The vacuum regulator (1) includes a main valve arranged to control a supply of air to the vacuum system (2). The main valve includes a valve seat (3) defining a passage (4) arranged to lead air to the vacuum system (2) and a valve body (5) moveably arranged in a direction between a closed position and a maximally open position in order to regulate the size of a minimum flow area (18) between the valve seat (3) and the valve body (5). A force (19) caused by the vacuum acts on the valve body (5) in a direction towards the closed position. The valve seat (3) and the valve body (5) have such a design, that the value of the force (19), in a continuous way, increases with the degree of opening of the valve body (5).

Abstract: An electronically modulating gas valve comprising a modulating solenoid for simultaneously displacing two servo regulator diaphragms, one for controlling LP Gas outlet pressure and another for controlling Natural Gas outlet pressure. A switch is used to select operation with either Natural or LP Gas, wherein the switch activates a gas selection solenoid for controlling gas flow through the Natural Gas servo regulator and the LP Gas servo regulator. The servo regulators are factory adjusted for a maximum Natural Gas pressure setting and a maximum LP Gas pressure setting. Thus, the gas valve is convertible from Natural Gas to LP Gas without re-adjustment.

Abstract: The fitting, in particular a safety valve, operates according to the relief principle or according to the loading principle. The fitting is opened and closed by a plurality of pilot parts. The pilot parts are connected in series in the control line of the fitting and are each actuated by a pilot valve. The pilot parts open the fitting only when all the pilot parts are in a position which opens the fitting. The fitting closes as soon as even only one of the pilot parts is in a position which closes the fitting.

Abstract: An electronically modulating gas valve comprising a modulating solenoid for simultaneously displacing two servo regulator diaphragms, one for controlling LP Gas outlet pressure and another for controlling Natural Gas outlet pressure. A switch is used to select operation with either Natural or LP Gas, wherein the switch activates a gas selection solenoid for controlling gas flow through the Natural Gas servo regulator and the LP Gas servo regulator. The servo regulators are factory adjusted for a maximum Natural Gas pressure setting and a maximum LP Gas pressure setting. Thus, the gas valve is convertible from Natural Gas to LP Gas without re-adjustment.

Abstract: An improved adjustable fluid flow regulator having a regulator chamber, a moveable diaphragm within the regulator chamber, a spring that acts upon the diaphragm to regulate the flow of fluid, and a first adjustment member and second adjustment member for adjustably biasing the spring against the diaphragm. The improvement includes a tamper resistant feature for restricting adjustment above a predetermined limit. The first adjustment member is fully adjusted to a limit. The second adjustment member is adjusted to bias the spring to a predetermined maximum setting, and restricted from further adjustment. The first adjustment member would subsequently be adjustable to any setting up to the predetermined limit.

Abstract: The invention relates to a gas pressure regulator having a valve, a delivery duct of low pressure gas (Pb), a regulation shutter for the gas delivery flow, a control head of the valve defining an upper chamber [(9)] and a lower chamber. A pilot valve controls the movement of the shutter. The pilot valve has a first chamber with an inlet way, a first outlet way communicating with said delivery duct and a second chamber in which there is the body of an interception shutter adapted to open or close the inlet way [(14)]. The first chamber has at least a second outlet way communicating with the lower chamber and the upper chamber and the inlet way are connected to each other through an auxiliary duct containing gas at an intermediate pressure (Pm) between high pressure (Pa) and low pressure (Pb).

Abstract: A pressure regulating valve having secondary venting measures. It comprises a control member for the control of the fluid connection between a primary duct and a secondary duct. The position of the control member is able to be influenced by a venting aperture also under the control of the control member and serving for venting the secondary duct. The venting opening is so arranged on the setting member that it is located outside the comparison chamber and in this respect either directly in the secondary duct or in a region in communication with the secondary duct.

Abstract: There is described a demand valve for a breathing apparatus wherein a pilot jet of the demand valve is controlled by a pivoting lever resiliently held against a planar face in which the pilot jet is formed. The pilot jet is preferably formed in a land surface surrounded by a recessed area of the planar face, and opening of the pilot jet is effected by movement of a control projection mounted on the pivoting lever. The area of the control projection is preferably greater than the area of the land surface.

Abstract: A discharge valve is provided to open an electrically controlled pilot valve in emergency situations such as during an electrical or hydraulic failure. The discharge valve has a poppet that operates in response to a pressurized control signal, which may be produced by a hand operated pump. When the poppet opens in response to the control signal, a path is established for fluid to flow from a control chamber of the pilot valve, thereby opening the latter valve.

Abstract: A hydraulic diaphragm valve comprising a housing, an inlet, an outlet, a diaphragm valve seating between the inlet and the outlet, a sealing diaphragm mounted in the housing and displaceable about the diaphragm valve seating, so as to close and open a flow path between the inlet and outlet, a valve control chamber and a command valve comprising a first duct communicating a one end thereof with the valve inlet, and at an opposite end thereof with a first command valve seating, a second duct communicating into one end with the valve outlet, and at an opposite end thereof, with a second command valve seating. A third duct communicates at one end with the valve control chamber and at its opposite end it selectively communicates with the first and second command valve seatings.