Fluid handling – Line condition change responsive valves – Pilot or servo controlled
Reexamination Certificate
1999-07-15
2001-02-20
Huson, Gregory L. (Department: 3753)
Fluid handling
Line condition change responsive valves
Pilot or servo controlled
C137S557000, C251S030010
Reexamination Certificate
active
06189563
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 an electronic control pilot operated pressure relief valve.
1. Field of the Invention
2. Description of the Prior Art
Industrial pressure relief valves are well known and several types are presently in use. Some being actuated by a spring releasing the valve to open under a predetermined pressure while others feature a frangible disc which ruptures or a slender column which buckles to permit a valve to open and release pressure. Other types of relief valves use the system pressure, when under the required limit, to maintain a relief valve closed and features an external pilot connected with the upstream side of the valve by small tubing to release excess pressure above a predetermined limit by allowing the valve to open and the system to blow down.
It is desirable to provide a pressure relief valve which is provided with valve head passageways allowing system pressure below a set pressure to maintain the valve closed but which is triggered open by a sensor sensing the pressure above a predetermined limit which quickly releases dome system pressure against the closed valve piston and discharges this pressure through the valve body to a downstream low pressure disposal system as the system blows down through the opened valve.
SUMMARY OF THE INVENTION
A bored and counterbored valve body having an inlet port is provided with a valve seat adjacent its inlet port. A lateral body bore intersects the counterbore to form an outlet port. A valve head closes the body bore opposite the inlet port and includes a skirt slidably receiving a piston having a valve closing the inlet port by seating on the valve seat. The piston valve features a rod-like axial stem centrally bored through the piston which slidably enters an axial blind sleeve forming a pressure chamber on the upper end on the valve head.
Fluid entering the valve body through its inlet port passes through the piston valve and pressure chamber and enters a manifold containing a normally closed two-position three-way pilot operated valve in fluid communication with the body bores and ports in the valve head. An electronic pressure sensor communicating with the pressure chamber energizes the solenoid pilot in response to fluid pressure above a predetermined value, of the three-way two position valve to open the latter to discharge fluid pressure in the valve head downstream through the outlet port allowing upstream fluid pressure to unseat the piston valve and open the body passageway to exhaust through the valve.
The principal object of this invention is to provide a fluid pressure relief valve normally closed by upstream fluid pressure against the downstream side of a piston valve which releases the valve closing fluid pressure to discharge downstream in response to upstream pressure against the piston valve above a predetermined limit.
REFERENCES:
patent: 4699351 (1987-10-01), Wells
patent: 5806553 (1998-09-01), Sidwell
Huson Gregory L.
Krishnamurthy Ramesh
Rhea Robert K.
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