FIELD: machine building.
SUBSTANCE: sliding stem control valve includes a valve body, a seat ring located within the valve body and a valve plug slidably mounted within the valve body, the valve plug and the valve seat cooperating to control fluid flow through the control valve. Composite seal assembly is located between the valve plug and the valve seat, the composite seal assembly includes a composite seal ring located between a first backup ring and a second backup ring. Biasing element is located adjacent the second backup ring and a retainer ring is located adjacent the biasing element to maintain the biasing element adjacent the second backup ring.
EFFECT: disclosed seal ring assembly provides superior sealing capabilities in high temperature environments while reducing or minimizing friction between the control member and the valve housing.
16 cl, 3 dwg
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