Importance

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Abstract

A high pressure poppet valve having a valve body defining inlet, outlet and vent passages, and with a valve cage in sealed relation within the valve body which defines an internal seat projection having spaced circular seat shoulders. A seal carrier, which may be a pilot pressure responsive piston, supports spaced seal glands each having a seal assembly composed of an elastomeric seal ring which is captured within a gland seal recess by a relatively hard, extrusion resistant seal ring defining a circular sealing corner. A spacer spool is interposed between the seal assemblies and maintains the seal assemblies within the respective gland seal recesses. The spacer spool defines support flanges at each end which cooperate with gland structure to secure the seal assemblies in a manner exposing only the circular seal corners of the extrusion resistant sealing elements for sealing engagement with the spaced circular seat shoulders of the internal seat projection and for securing the circular sealing corners against pressure induced extrusion. The seal carrier element is guided and stabilized during its linear movement within the valve cage.

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First Claim