Dome pressure maintaining valve

Patent · Tue Dec 04 04:00:00 EST 1990

OSTI ID:5200991

Snyder, D E

This patent describes a system for maintaining dome fluid pressure in a pilot operated relief valve. It comprises: a fluid pressure maintenance means having an inlet port for receiving pressurized fluid supply from a source requiring pressure relief maintenance and an outlet port for expelling the pressurized fluid from the fluid pressure maintenance means; the fluid pressure maintenance means being placed in a circuit between a sensor inlet and the pilot valve, means capable of being adapted with fixed or adjustable pressure setting functionality; the fluid pressure maintenance means outlet port in communication with a dome of the relief valve through the pilot; the fluid pressure maintenance means functioning through a poppet check valve for equalizing inlet and outlet pressure. The poppet check valve providing inlet flow and check for reverse flow; the poppet check valve and a piston valve integrated into one piston valve embodiment with the piston valve providing outlet flow in a backflow relief mode; and the fluid pressure maintenance means having a pressure storage chamber for providing a maintaining fluid pressure in the relief valve dome.

• Assignee: Axelson, Inc., Longview, TX (USA)
• Patent Number(s): US 4974631; A
• Application Number: PPN: US 7-420173
• OSTI ID: 5200991
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
022000* -- Petroleum-- Transport
Handling
& Storage
03 NATURAL GAS
032000 -- Natural Gas-- Transport
Handling
& Storage
42 ENGINEERING
420202 -- Engineering-- Protective Structures & Equipment
CONTROL
CONTROL EQUIPMENT
DESIGN
EQUIPMENT
EQUIPMENT PROTECTION DEVICES
FLOW REGULATORS
FLUID FLOW
MEASURING INSTRUMENTS
PRESSURE CONTROL
PRESSURE GAGES
RELIEF VALVES
VALVES