Class 137/500 - Expansible chamber subject to differential pressures

Subclass of Class 137 - Fluid handling
Definition: Apparatus in which the valve is operated by a movable reaction
No. of patents: 23
Last issue date: 10/31/2006

Number	Title	Issue Date
7128086	Flow control valves In one embodiment, a flow control valve includes a valve body having an inlet, an outlet, a flow passageway coupling the inlet to the outlet, and a cavity with first and second chambers. The valve further includes a hollow piston disposed in the first chamber and a ...	10/31/2006
7108241	Flow control valve A flow control valve includes a main body 1, bonnet 2, spring receiving portion 3, piston 4, spring 24, first diaphragm 27, first valve member 5, second valve member 6 and base plate 7, wherein an openin...	09/19/2006
7086841	Air compressor with inlet control mechanism and automatic inlet control mechanism An automatic inlet control mechanism and air compressor unit include a valve cavity and valve outlet. The valve cavity includes a valve control chamber and valve inlet chamber. A valve piston assembly is positioned between the valve control chamber and the valve inl...	08/08/2006
7066200	Insert for dynamic flow control An insert for being mounted in a valve housing (80) or a tubular member for dynamic flow control of a flowing medium. The insert comprises:—a first cup-shaped part (1) provided with an outflow area;—a second cup-shaped part (10) arranged axi...	06/27/2006
6354319	Low differential, pilot operated fluid pressure regulation apparatus and method An apparatus and method for regulating the pressure of fluid flowing though a conduit system according to which a valve seat is formed in a lower housing connecting in the conduit system with the seat extending between an upstream portion of the system an...	03/12/2002
6182688	Autonomous device for limiting the rate of flow of a fluid through a pipe, and fuel circuit for an aircraft comprising such a device A device for limiting the flow rate of a fluid through a conduit operates autonomously without any external energy source, and independently of the level of pressure upstream, by operating on an imposed upstream-downstream pressure difference. The flow li...	02/06/2001
6179020	Fluid level controlled automatic shutoff valve The present fluid level controlled automatic shutoff valve is comprised of a tubular housing with an axial bore which has an upstream closure, a downstream opening, and an annular piston seat at the downstream opening. A movable piston is positioned in th...	01/30/2001
5983926	Flow control valve A first pressure chamber and a second pressure chamber are provided with means for continuously exerting a constant inward pressure on a first diaphragm part and a third diaphragm part respectively. A valve chamber having a flow control portion wherein a ...	11/16/1999
5842502	System for controlling flow through a process region A regulator for maintaining a constant partial vacuum in a region, such as in a piece of process equipment or a fume hood. The regulator includes a path, through which fluid passes from the region to the vacuum source, and a movably mounted piston having ...	12/01/1998
5797418	Differential pressure detector with reduced reaction forces A differential pressure detector for providing an output pressure modulated as a function of the pressure drop between the pressures upstream and downstream of a fuel metering device, comprising first and second input chambers for connection to said upstr...	08/25/1998
5678602	Gas control and dispensing assembly and gas storage device equipped with such an assembly Gas control and dispensing assembly comprising a lower unit (1) which is mounted on a gas tank (4) and houses a regulator (10, 9) and an upper unit (5) which is mounted on the lower unit (1) via a threaded ring (24) and houses an indexed flowmeter valve (...	10/21/1997
5642752	Controllable constant flow regulating lift valve The present invention relates to a controllable constant flow regulating lift valve of a direct-acting automat ic control type that operates on an operating force derived from the condition of a working fluid, such as valve-inlet pressure prevailing in th...	07/01/1997
5282490	Flow metering injection controller A differential pressure regulator and accompanying system enabling accurate metering of fluid under high-pressure, low-flow conditions. An annular passage within the fluid flow path of the regulator creates an additional pressure drop within the regulator...	02/01/1994
5220940	Flow control valve with venturi To measure and control the flow of fluid through a passageway, a venturi meter and a regulator are disposed in the passageway. The area of the cross-section gradually decreases and then gradually increases. The venturi meter also has first and second stat...	06/22/1993
4821625	Valve device for controlling the delivery of pressurized liquid to two separate hydrostatic motors Valve device for controlling the delivery of pressurized fluid from a common pump to two hydrostatic working motors, one of which is subjected to a load dependent on the speed of the other motor. A volume flow regulator is disposed in the flow path betwee...	04/18/1989
4570667	Demand responsive flow regulator valve A demand responsive flow regulator valve for use with a power steering pump and steering mechanism has a valve spool slidably disposed in a housing and responsive to a pressure differential across an orifice for the purpose of bypassing excess pump flow. ...	02/18/1986
4549566	Flow volume control device for power steering system A flow volume control device for use in a power steering system, which comprises: a casing having an inlet port, a reflux port and a delivery port; a fluid passage formed in the casing in communication with the inlet, reflux and delivery ports; fixed orif...	10/29/1985
4545403	Flow regulating device A device for regulating the flow or outflow of liquids comprises an outer encasing tube, having a feed tube connected to an inlet and in which is a cylindrical hose coupling is disposed, which is tightly connected to an outlet. The liquid acts indirectly ...	10/08/1985
4435151	Fuel supply control system A fuel supply control system including a major area diaphragm and a minor area diaphragm defining therebetween a reference pressure chamber. A control pressure chamber is located adjacent the major area diaphragm on a side thereof opposite to the referenc...	03/06/1984
4336904	Delivery stabilizer for ventilation shaft A bladder, suitably formed of silicone rubber and molded into a cylindrical shape, is provided internally with a deforming spring. The resultant unit serves as a delivery stabilizer for a ventilation shaft without loss of elasticity of the bladder....	06/29/1982
4251027	Variable volume control assembly An improved variable volume control assembly for conditioned air systems having an improved air flow amplifying sensing means that amplifies the difference between the total pressure and the static pressure and is sensitive at low pressures, an improved a...	02/17/1981
3978883	Device for regulating the combustion air of a furnace, especially with oil- or gasburner and blower for heating installations The invention relates to a furnace type air throttle assembly which operates in a manner to supply a constant volume of air per unit time. This is done with a bellows and throttle arrangement in which (1) the total pressure at the inlet, which is the sum ...	09/07/1976
3940928	Air diverter valve In an emission control system having an air pump for delivering air to the exhaust system of an internal combustion engine, a valve controls the air pump discharge pressure in a fixed relationship to exhaust pressure by diverting a portion of the air pump...	03/02/1976

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Class 137/500 - Expansible chamber subject to differential pressures