Class 137/490 - Pilot valve within main valve head

Subclass of Class 137 - Fluid handling
Definition: Apparatus in which the valve controlling the servo fluid
No. of patents: 25
Last issue date: 07/18/2006

Number	Title	Issue Date
7077157	Spring-loaded pressure relief valve, particularly for containers of pressurized fluids A spring-loaded pressure relief valve, particularly for containers of pressurized fluids, comprising a valve body that is associable with a container and forms a discharge port that is controlled by a main piston; an auxiliary valve is further provided, which contro...	07/18/2006
7073490	Gas feeding system for an internal combustion engine, having an improved pressure reducing valve In a gas-supply system for internal-combustion engines, a pressure-reducing valve is set between the reservoir of the gas and a distribution manifold or rail that feeds the gas to a series of electromagnetically controlled injectors associated to the various cylinde...	07/11/2006
7044011	Test fixture assembly for directional pilot valve and related method 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 direc...	05/16/2006
7017605	Valve assembly A valve assembly (112) includes a first member (120) having a cavity (136). A poppet (142) is located in the cavity (136) in the first member (120). The poppet (142) is axially movable relative to the first member (	03/28/2006
6516825	Method and valve device for counteracting harmful pressure pulses in a hydraulic system A method and a valve apparatus for counteracting harmful pressure pulses caused by rapid retardation of a liquid in a hydraulic system comprising a pump for the supply of liquid to a conduit stretch containing a non-liquid-filled volume. The valve apparat...	02/11/2003
6105608	Gas purge valve A gas purge valve comprising a valve housing that has a valve inlet and major and minor valve outlets, a valve partition mounted in the housing divides the housing into a first chamber communicating with the valve inlet and a second chamber that communica...	08/22/2000
5794652	Relief valve The invention relates to a relief valve and intends to provide a relief valve which can reduce the difference between the dynamic set pressure and static set pressure of the relief pressure and its variation. An internal circumferential surface of the pilot va...	08/18/1998
5791372	Relief valve The invention intends to provide a relief valve which can prevent malfunction caused by generation of negative pressure lowering the minimum pressure to be originally maintained by a load circuit. Maloperation of a relief valve 401 is prevented by allowing a c...	08/11/1998
5676172	Relief valve The invention relates to a relief valve and intends to provide a relief valve designed to improve response and operational stability. In an overload prevention safety device in which a main valve element including a pilot valve element in a valve case is ...	10/14/1997
5460198	Pressure-activated flow-control valve A valve assembly used in combination with a pressurized-fluid source having a high-pressure side and a low-pressure side and a load has a pressure-actuated flow regulating valve having a housing and a valve body movable in the housing and defining therein...	10/24/1995
5404902	Isolation automatic control valve An isolation automatic control valve is formed by disposing an isolation valve of very simple structure in the inlet and outlet passages of a main valve or in the passage joining a main valve and its pilot valve, which not only controls normal operation d...	04/11/1995
4942900	Pressure control valve A pressure control valve has a main valve element of seat type slidably accommodated in a valve case for controlling communication between inlet and outlet sections of the valve case by movement of the main valve element, a control chamber defined within ...	07/24/1990
4757839	High pressure relief valve A high pressure relief valve for use in fluid systems, gas or liquid with zero leakage at pressures of 25,000 psi and above. The relief valve includes a valve body having an axial bore communicating with the high pressure fluid system with at least one, a...	07/19/1988
4716927	Integrated control safety valve means Control safety valve means for an enclosure containing a pressurized fluid. With the cylindrical chamber, the piston defines a pressure chamber for closing the main valve, the pressure chamber being linked with the enclosure by a passage. The piston has a...	01/05/1988
4667695	Pressure regulating and on-off valve A two stage relief valve, in which the pilot flow is limited by an active flow control element to a specific maximum predetermined level, to extend its maximum operating pressure range and to improve its operating characteristics. The downstream orifice m...	05/26/1987
4665942	Hydraulic pressure fuse A hydraulic fuse closes flow of hydraulic fluid in a hydraulic line upon loss of downstream fluid pressure. The hydraulic fuse includes a housing having an upstream opening and a downstream opening and a poppet slidably mounted within the housing for open...	05/19/1987
4552173	Integrated control safety valve It comprises a valve body constituted by a cylinder, defining a chamber and a seat, a valve placed in the cylinder and having a stem, a main flap and a plunger sliding in the chamber, means for elastically applying the main flap to the seat, a passage est...	11/12/1985
4541562	Mixing valve The mixing valve includes a plurality of flow regulating assemblies (A) each of which independently regulates the flow of one of a plurality of fluids. Each flow regulating assembly includes a pressure displaceable structure (22) which is physically displ...	09/17/1985
4534380	Gas regulator valve A gas regulator valve comprising a housing with an inlet and an outlet and a partition wall or the like, which divides the housing into two chambers. The inlet communicates with the first chamber and with the outlet via a main valve. Between the two chamb...	08/13/1985
4444215	Mixing valve The mixing valve includes a plurality of flow regulating assemblies (A) each of which independently regulates the flow of one of a plurality of fluids. Each flow regulating assembly includes a pressure displaceable structure (22) which is physically displ...	04/24/1984
4273154	Device for regulating the vacuum in a vacuum line system, especially for milking installations A device for regulating the vacuum in milking installations has a main valve and an auxiliary valve. A main valve chamber is connected with the atmosphere and, through a valve seat to the vacuum line. A control chamber is closed off from the main valve ch...	06/16/1981
4076041	Pilot valve operated demand regulator for a breathing apparatus A scuba regulator second stage utilizes pneumatic amplification to achieve very low inhalation effort. The regulator includes (a) a main flow valve consisting of a poppet moveable within a valve housing inside the regulator body, (b) a pilot valve mounted...	02/28/1978
3972345	Pilot operated relief valve A pilot operated fluid pressure relief valve has a main valve operable by opposed piston areas, both normally exposed to inlet pressure whenever that is below the maximum pressure setting of the valve. A pressure responsive pilot valve is exposed to inlet...	08/03/1976
3963044	Pilot valve operated pressure regulator This disclosure relates to a hydrant coupling device including a pressure control valve which, due to its portability, may be connected to any one of a plurality of hydrants to regulate the flow of liquid therefrom, and additionally including a pit valve ...	06/15/1976
3945393	Regulating valve Flow rate limiting valve for pipes for liquid or gaseous fluids of the type comprising a cup plug which extends telescopically from an ogival chamber contained in the valve body, and communicates with the fluid upstream of the valve seat by a channel in t...	03/23/1976

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Class 137/490 - Pilot valve within main valve head