US 11,859,722 B2
Systems and methods for piston check valves
Sidney McCarra, League City, TX (US)
Assigned to SCV VALVE, LLC, Santa Fe, TX (US)
Filed by SCV Valve, LLC, Santa Fe, TX (US)
Filed on May 20, 2022, as Appl. No. 17/664,378.
Application 17/664,378 is a continuation of application No. 17/077,549, filed on Oct. 22, 2020, granted, now 11,365,820.
Claims priority of provisional application 62/925,654, filed on Oct. 24, 2019.
Prior Publication US 2022/0282797 A1, Sep. 8, 2022
Int. Cl. F16K 15/06 (2006.01); F16K 27/02 (2006.01); F16K 15/18 (2006.01)
CPC F16K 15/063 (2013.01) [F16K 15/18 (2013.01); F16K 27/0209 (2013.01); Y10T 137/7925 (2015.04); Y10T 137/7929 (2015.04); Y10T 137/7937 (2015.04)] 20 Claims
OG exemplary drawing
 
1. A piston check valve, comprising: a body; an upstream flange; a downstream flange, the downstream flange being disposed opposite the upstream flange; a bonnet secured to the body; a piston including a proximal end that faces the bonnet and a distal end that faces a portion of the body, the piston having a central pillar forming a narrowed portion connected to and extending axially between the proximal end and the distal end of the piston; a retainer that surrounds the proximal end, the central pillar, and the distal end of the piston; and a valve secured to the piston.