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 |
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.
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