Fluid handling – Destructible or deformable element controlled – Destructible element
Reexamination Certificate
2000-04-06
2001-08-21
Chambers, A. Michael (Department: 3753)
Fluid handling
Destructible or deformable element controlled
Destructible element
C137S070000, C137S312000
Reexamination Certificate
active
06276389
ABSTRACT:
CROSS REFERENCE TO RELATED APPLICATIONS
Not applicable.
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
Not applicable.
BACKGROUND OF THE INVENTION
The present invention relates to relief valves and more particularly to a relief valve safely controlling hazardous fluid material under pressure greater than atmospheric.
1. Field of the Invention
One of the problems associated with use of toxic material particularly in gaseous form resides in the ability to control the pressure of such under which such fluids are contained and to safely release that pressure in the event it exceeds a predetermined limit. This valve, it is believed, will provide a safety relief valve which permits toxic fluid under greater than a predetermined limit opens the valve and permits a release of such excess pressure downstream to a toxic safe receptacle from which the fluid can be treated to render it harmless.
2. Description of the Prior Art
U.S. Pat. No. 4,724,857, issued Feb. 16, 1988, to Taylor, for PRESSURE RELIEF VALVE, this patent discloses an Emergency Shutoff Valve, which is responsive to upstream fluid pressure and is monitored by a piston having the upstream fluid pressure on one side of the piston with downstream pressure balanced with a through stem area equal to the piston area. Fluid at set pressure ruptures a collapsible pin to release the upstream fluid pressure to a downstream vent area.
This invention is believed distinctive over the above and similar safety relief valves by monitoring the fluid pressure of toxic material and releasing such pressure to a downstream chamber for safe disposal of fluid leaking past the stem and piston seals during operation. Static seals are reliable but piston and stem seals may leak in operation.
BRIEF SUMMARY OF THE INVENTION
An elongated valve body having bolt flange ends is provided with an inline bore for axially connecting the valve body to a line containing toxic material. An partition angularly disposed with respect to the longitudinal axis of the inline bore divides the valve body to form an upstream toxic containing compartment and downstream exhaust end portion. The partition is centrally bored and its bore is in axial alignment with a lateral opening having its axis inclined downstream with respect to the longitudinal axis of the inline bore. The lateral opening is provided with a centrally bored bushing which slidably receives one end portion of a valve stem characterized by an outstanding flange forming a stop intermediate the ends of the valve stem. A centrally bored and counterbored bonnet is rigidly secured to the outward end of the bushing and forms a leak collecting chamber which longitudinally slidably receives the stop when the valve stem is axially moved relative to the valve body and its partition.
Cage means is axially connected with the valve body bonnet and includes an end plate supporting one end portion of a collapsible pin with the other end portion of the collapsible pin nested by a suitable bore formed in the outwardly directed end portion of the valve stem. A lateral port in the valve bonnet provides discharge for toxic material which might leak by O-rings surrounding the valve stem end portions to be discharged to a safe receptacle, not shown.
Proximity sensor means supported by the valve body bonnet is disposed adjacent the longitudinal axis of the collapsible pin for remote monitoring and alerting personnel to a collapsed condition of the collapsible pin in response to excess toxic fluid pressure against the end portion of the valve stem projecting through the valve body partition bore. The area of this bore is equal to that of the valve stem which is also equal to the valve stem cross-section area projecting through the collection chamber.
The principal object of this invention is to provide an inline pressure relief valve which monitors the working pressure of toxic material and safely releases such pressure when it exceeds a predetermined value and safely discharge a quantity of toxic material without polluting the environment. An additional object being a proximity sensing means for remote determination of whether the valve has been opened or not.
REFERENCES:
patent: 4724857 (1988-02-01), Taylor
patent: 5577523 (1996-11-01), Taylor
patent: 5694117 (1997-12-01), Sugarek
Chambers A. Michael
Rhea Robert K.
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