Systems and methods for piston check valves
AssigneeSCV Valve, LLC
InventorSidney McCarra
Life of this patent
Estimating the term…
Abstract
A piston check valve system includes a body including an upstream end and a downstream end, a bonnet secured to a proximal opening of the body, and a piston secured within the body, the piston being moveable between a closed position in which the piston rests upon a valve seat and an open position in which the piston is spaced away from the valve seat. The piston check valve system also includes a retainer configured to guide and retain the piston and to secure the valve seat within the body.
Claims19
A piston check valve system, comprising:
- a body including an upstream end and a downstream end;
- a bonnet secured to a proximal opening of the body;
- a piston secured within the body, the piston being moveable between a closed position in which the piston rests upon a valve seat and an open position in which the piston is spaced away from the valve seat, the piston including a rim configured to contact the bonnet when the piston is in the open position, the valve seat having a sealing surface that is inclined or chamfered;
- and
- a retainer configured to guide and retain the piston and to secure the valve seat within the body, the retainer including a first surface configured to guide a proximal portion of the piston and a second surface configured to guide a distal portion of the piston.
A piston check valve system, comprising:
- a body including an upstream opening and a downstream opening;
- a piston secured within the body between the upstream opening and the downstream opening, the piston being moveable between a closed position in which an end face blocks a flow of fluid and an open position, the piston including a rim configured to contact a bonnet of the piston check valve system when the piston is in the open position;
- a resilient member biasing the piston towards the closed position;
- and
- a cage surrounding a proximal end of the piston, the cage including a distal bridge configured to contact an outer periphery of the end face of the piston and to guide and retain the piston and to secure a valve seat within the body,
- the check valve system including a protrusion extending from one of the valve seat or the cage such that the protrusion faces and is received by a recess formed in the other of the valve seat or the cage, the protrusion protruding in a direction parallel to a direction of movement of the piston.
A method of assembling a piston check valve system including a removable valve seat, the method comprising:
- securing the removable valve seat in a body of the piston check valve system;
- retaining the removable valve seat with a retainer that presses upon a surface of the removable valve seat, the removable valve seat having a sealing surface that is inclined or chamfered, the retainer including a first surface configured to guide a proximal portion of a piston and a second surface configured to guide a distal portion of the piston;
- positioning a piston within the retainer such that the piston is configured to slide with respect to the retainer, the piston including a rim configured to contact a bonnet when the piston check valve system is in an open position;
- and
- securing the retainer with the bonnet.
Dependencies are inferred from the claim text.