Relief valve
Relief valve to permit slow and fast bleeding rates at difference pressure levels
Steenken, J.↗
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Inexpensive tamper proof safety relief valve
Basic relief valve has added safety relief valve capability that relieves overpressure before failure can occur. It may be installed in inaccesible areas with a high degree of reliability, constructed from a variety of materials, and adapted to the user's specific application.
Frankewich, P. A.↗
Dual rate pressure relief valve
Pressure relief valve vents at a slow bleed rate at one pressure level and at a higher bleed rate at a higher pressure level. The value housing contains a sleeve, inlet port, outlet port, an orifice, a ball and seat arrangement, and a belleville spring diaphragm.
Steeneken, J.↗
Check valve installation in pilot operated relief valve prevents reverse pressurization
Two check valves prevent reverse flow through pilot-operated relief valves of differential area piston design. Title valves control pressure flow to ensure that the piston dome pressure is always at least as great as the main relief valve discharge pressure.
Oswalt, L.↗
Magnetically Retained Relief Valve
A pressure relief valve includes a housing having a fluid inlet and at least one fluid outlet. A first structure mounted in the housing and fixed in relation thereto is in magnetic attraction with a second structure coupled to a piston disposed in a portion of the housing. The piston defines a chamber disposed adjacent to the fluid outlet(s) throughout the piston's stroke. The piston includes a sealing element providing a sealing force to prevent flow through the valve. The sealing force is independent of the magnetic attraction force between the first and second structures.
Johnson, Wesley L.↗
Damage-Free Relief-Valve Disassembly
Tool safely disassembles relief valves without damage to sensitive parts. Relief-valve disassembly tool used to extract valve nozzle from its housing. Holding device on tool grops nozzle. When user strikes hammer against impact disk, holding device pulls nozzle from press fit. Previously, nozzle dislodged by striking spindle above it, but practice often damaged retaining screw. New tool removes nozzle directly. With minor modifications, tool adapted to valves from different manufacturers.
Haselmaier, H.↗
Force Augmentation for Relief Valve
Simple design change for poppet relief valve enables flow through valve to exert additional force to help keep valve open. Although originally intended for relief valves for liquid oxygen and liquid nitrogen in Space Shuttle orbiter, concept is applicable to pressure-or flow-actuated valves for wide range of fluids and temperatures.
Luger, J.↗
Improved Relief Valve Would Be Less Susceptible to Failure
The balanced-piston relief valve with side vented reaction cavity has been proposed as an improved alternative to a conventional high-pressure, high-flow relief valve. The proposed valve would be less susceptible to failure. A typical conventional high-pressure, high-flow relief valve contains a piston that is exposed to the upstream pressure across the full valve-seat diameter and is held against the valve seat and the upstream pressure by a large spring. In the event of an increase in upstream pressure to a level above the valve set point (the pressure above which the valve opens), the opening force on the piston can be so large that the piston becomes accelerated to a speed high enough that the ensuing hard impact of the piston within the valve housing results in failure of the valve. For a given flow cross section, the proposal would significantly reduce the force, thereby reducing susceptibility to failure. A basic version of the proposed balanced-piston relief valve with side vented reaction cavity is described.
Farner, Bruce R.↗
Relief Valve Opens And Closes Quickly
Relief valve opens quickly to relieve excess pressure and closes quickly when pressure drops slightly below relief pressure. O-ring exposes one or more ports under high pressure, releasing excess pressurized fluid. Adjusting screw used to change compression on Belleville-spring washers and to set pressure at which valve opens. Designed for use aboard Space Shuttle to vent pressurized hydrazine to vacuum, valve concept useful in industrial applications where rapid opening, rapid closing, or low susceptibility to blockage by vented fluid required.
Svejkovsky, Paul A.↗
Aspirator increases relief valve poppet stroke
Addition of an aspirator to a relief valve increases the valve poppet stroke under dynamic flow conditions. The aspirator allows poppet inlet dynamic forces to overcome relief valve spring force. It reduces the fluid pressure in the skirt cavity by providing a low pressure sense probe.
Biddle, M. E.↗
Development Specification for RV-346/348 Positive Pressure Relief Valves (PPRV)
This specification establishes the requirements for design, performance, safety, testing, and manufacture of the RV-346 and RV-348, Positive Pressure Relief Valve (PPRV) as part of the Advanced Extravehicular Mobility Unit (EMU)(AEMU) Portable Life Support System (PLSS). The RV-346 serves as the Positive Pressure Relief Valve (PPRV), and the RV-348 serves as the Secondary Positive Pressure Relief Valve (SPPRV).
PPR↗
8-inch Reflange Inlet and Two 6-inch 600# Flange Outlets Relief Valve Description and Specifications
In the past, an Anderson Greenwood (AG) pilot operated relief valve was used to protect the E-1 rocket engine test facility. It was found that the AG valve is destroyed and discharges internal parts at a great velocity on opening. This is a major safety and cost issue. The solution is a relief valve to match present Anderson Greenwood pilot valve A 8z B dimensions. The valve is to use a precise buckling pin obeying Euler s Law to act as the pressure sensor and actuator. The valve must not self destruct on opening.
Source record↗
Sensitive low-pressure relief valve has positive seating against leakage
A pilot-operated relief valve which provides positive seating against leakage in cryogenic systems is described. The principal advantage is that the pilot poppet is unaffected by variations in control pressures in the pilot cavity, and results in a more accurate sensing of inlet pressure conditions.
Source record↗
Dual relief-valve system
System allows removal and recertification of pressure-relief valve without compromising safety requirements or depressurizing pressure vessels.
Karns, J. R.↗
Compound pressure and vacuum relief valve, 2-inch. Ladewig Valve Company part number 3302- F, NASA drawing number 75 M04406 PRV-3
Functional and environmental testing of compound pressure and vacuum relief valve for Saturn Ib launch vehicle
FUNCTION TEST↗
Relief valve assembly, Stratos PN 834000 Final report
Design and performance of relief valve assembly for metabolic activity system of biological experiment on orbital workshop vehicle
Morando, J.↗
Inexpensive Pressure-Relief Valve
Simple device vents excess low-pressure gas. Inexpensive pressure relief valve built from polyvinylchloride pipe. Valve suitable for low pressure-- 25 to 50 cm of mercury-- and flow rates up to 14 m3/min.
Theordore, E. A.↗
Program summary report 10-inch LOX vent and relief valve, PN 5640073
Design and performance of liquid oxygen tank vent and relief valve
Trautner, M. C.↗