Non-flowing modulating pilot operated relief valve
AssigneeTeledyne Industries, Inc.
InventorGelu N. Gavrila
Life of this patent
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Abstract
A pilot operated relief valve which includes a non-flowing modulated pilot valve and a main valve. The pilot utilizes a torsion device in connection with transducers and valves. The transducers relate variations in pressure within the valve system to the torsion device. The torsion device, in turn, acts to open and close various ports of the pilot valve so as to achieve modulated relief of overpressurized fluid from a pressure system. In addition, the torsion device can be manipulated to provide for easily achieved and accurate set pressure positions.
Claims29
A non-flowing modulating pilot device for use in a relief valve system wherein the pilot device controls a piston-covers-nozzle type of main valve connected to a pressure system which is protected by the relief valve system, said pilot device receiving a pressure signal corresponding to the pressure in the pressure system and being operable to control the pressure in a dome pressure chamber of the main valve with the dome pressure biasing the piston in the main valve to regulate flow through the main valve, said pilot device comprising:
- a housing which has a controlled pressure chamber and a second pressure chamber;
- a torsion device;
- said controlled pressure chamber including a vessel pressure inlet port, a venting port and first and second communication ports, said first communication port communicating with the dome pressure chamber of the main valve and said second communication port communicating with the second pressure chamber;
- first and second pressure transducers;
- said first pressure transducer communicating with the second communication port of the controlled pressure chamber, said first pressure transducer having means for sensing pressure variations in said controlled pressure chamber, and said first pressure transducer being adapted to torque said torsion device in response to the sensed pressure variations;
- said second pressure transducer communicating with the pressure system which is protected by the relief valve system, said second pressure transducer having means for sensing pressure variations in the pressure system, and said second pressure transducer being adapted to torque said torsion device in response to the sensed pressure variations in the pressure system.
Dependencies are inferred from the claim text.