Self-contained hydraulically controlled relief valve
AssigneePremium Oilfield Technologies, LLC
InventorDouglas Jahnke
Life of this patent
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Abstract
The present disclosure provides a hydraulically controlled pressure relief valve without needing a hydraulic power unit. The valve maintains the accuracy of a hydraulically controlled valve by providing a self-contained closed hydraulic system built into the pressure relief valve. For safety, the valve can be kept open to call attention to the cause of the pressure relief valve activation, yet be easily reinstated into full service without replacing expendable components such as shear pins and rupture pins. The invention offers a pressure relief valve with accuracy, cost, and ease of use.
Claims13
A pressure relief valve, comprising:
- a valve body comprising:
- an inlet and an outlet establishing a valve flow path;
- and
- a seat;
- and
- a plug configured to engage the seat and selectively allow fluid flow through the valve flow path;
- and
- an actuator coupled with the valve body, comprising:
- a primary chamber comprising:
- a primary piston sealably engaged in the primary chamber and longitudinally displaceable inside the primary chamber corresponding to a displacement of the plug relative to the seat;
- and
- a secondary stem extending longitudinally in the actuator and coupled to the plug on a first portion and coupled with the primary piston on a second portion for longitudinally displacement in association with the primary piston;
- a transverse chamber wall;
- a secondary chamber, wherein the transverse chamber wall is disposed between the primary chamber and the secondary chamber, the secondary chamber comprising:
- a secondary piston sealably engaged in the secondary chamber, the secondary piston being longitudinally displaceable inside the secondary chamber;
- and
- an actuator bias element configured to bias the secondary piston toward the chamber wall;
- and
- a chamber actuator configured to selectively allow actuator fluid flow through a passageway formed between the primary chamber and the secondary chamber.
Dependencies are inferred from the claim text.