Patent ID: 9739385
Date: 2017-08-22
CPC Classifications: F16J,F16K

Claim:
1. An apparatus comprising: a body; an inlet port providing a fluid entrance to the body; a chamber having an inner surface; an outlet port in fluid communication with the chamber and providing a fluid exit from the body; a piston disposed within the chamber, wherein the piston is moveable between: a seal secured to the inner surface of the chamber and biased against the piston when the piston is in the first set position; a seal guard slidably disposed within the chamber; a seal retainer secured to the inner surface of the chamber, the seal retainer comprising: a spacer ring comprising: an o-ring contained in the o-ring orifice; and a lower piston seal comprising: a second lower-piston-seal arm coupled to a second side of the lower-piston-seal pad and positioned in the seal-retainer groove; wherein the seal guard is moveable between a first seal-guard position in which the seal guard does not shield the seal and a second seal-guard position in which the seal guard shields the seal, wherein the seal guard is in the first seal-guard position when the piston is in its first set position and the seal guard is in the second seal-guard position when the piston is in its second open position.