Check valve actuator
AssigneeWheatley Pump and Valve, Inc.
InventorJohn L. Strelow
Life of this patent
Estimating the term…
Abstract
The invention disclosed herein relates to a check valve actuator for opening and closing a check valve, utilizing system pressure. The check valve actuator is comprised of a piston connected to a clapper assembly by a connecting rod. The piston is slideably received in a piston cylinder containing a control valve and a latching stem. A protective cage and a protective cover are mounted over the piston cylinder.
Claims21
A check valve actuator apparatus for opening and closing a clapper-type check valve assembly in a pressurized gas system, comprising:
- a piston vertically mounted above said check valve;
- a linkage connecting said piston to said check valve;
- a cylinder enclosing said piston with sufficient clearance for gas to leak between said piston and said cylinder;
- and
- a control valve connected to said cylinder above said piston to relieve pressure within said cylinder.
A check valve for use in a gas-pressured pipeline comprising:
- a clapper-type closure member pivotally suspended within said check valve;
- a vertically disposed piston/cylinder assembly mounted above said check valve with sufficient clearance between said piston and said cylinder to enable said piston to move downward within said cylinder by the force of gravity, and to enable gas to pass between said piston and said cylinder;
- a linkage pivotally connected at one end to the lower end of said piston and at its other end to said closure member such that upward movement of said piston will open said closure member;
- and
- a control valve connected to said cylinder above said piston operable to release pressure from said cylinder.
A check valve for use in a pipeline comprising:
- a clapper-type check valve adapted to be connected in a pipeline and including a clapper valve and a clapper arm pivotally attached to said clapper valve;
- a vertically disposed cylinder closed at its upper end and open at its lower end to communicate with pressure within said pipeline on the downstream side of said check valve;
- a piston within said cylinder movably fitted within said cylinder to enable gas to leak past said piston;
- said piston coupled to said clapper-type check valve to move between a first low position within said cylinder when said check valve is closed and a second, high position when said check valve is open;
- and
- a control valve connected to said cylinder above said piston operable to vent pressure from said cylinder.
Dependencies are inferred from the claim text.