| 摘要 |
<p>A pressure responsive valve having a body defining an inlet, an outlet, a valve seat surrounding the communication through the body between said inlet and said outlet and a bore having cylindrical walls in alignment with said valve seat, a valve member positioned within said body and adapted to reciprocate to open and close flow through said valve seat and having an O ring groove around a portion of said valve member which reciprocates within said bore, an O ring in said groove and a communication defined through said valve member to exert pressure from the area of said valve seat to the interior of said O ring groove whereby the O ring is energized into engagement with the walls of said bore to provide a drag resisting the movement of said valve member. This abstract is neither intended to define the invention of the application which, of course, is measured by the claims, nor is it intended to be limiting as to the scope of the invention in any way.</p> |
