| 摘要 |
A high pressure, low friction slide valve incorporates a valve body defining parallel spaced internal sealing surfaces and inlet, vent and function ports communicating with an internal valve chamber. A seal carrier is movable within the valve chamber and supports a seal cylinder for rockable motion therein. The seal cylinder has sealing contact with one of the sealing surfaces while a seal rod projecting from a transverse passage of the seal cylinder has sealing contact with the opposite sealing surface. Within the seal rod is positioned a packing member which is of a configuration establishing sealing within the seal cylinder only at a location immediately adjacent the inner end of the seal rod, thus permitting the seal cylinder and seal rod to have low friction metal-to-metal sealing engagement with the parallel sealing surfaces without necessitating the provision of close tolerance seals or O-rings and thus permitting efficient high pressure sealing and low friction movement of the valve mechanism.
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