| 摘要 |
There are disclosed herein several embodiments of a pressure responsive discharge valve assembly particularly adapted for use in reciprocating type gas compressors. The valve assembly includes a discharge passage valve seat of frusto conical shape in which a generally complementary shaped light-weight valve member is disposed. The valve member is preferably formed from a polymeric material, but may also be formed of metal. The materials used and the relative geometry of the valve seat and member are such as to reduce clearance or reexpansion volume, provide quiet closure with good sealing, long life and high speed operation, and still have the required flow areas at low valve lifts, thereby providing improved flow characteristics and efficiency. The included angles of the valve and seat are slightly different to provide progressive closing and sealing without permanent deformation. The valve concepts are also disclosed embodied in two other known types of valves in which the valve element is provided with a central opening and associated closure means to provide additional discharge flow area. The closure means in one embodiment is in the form of a fixed member and in another embodiment is in the form of a second separately biased movable valve disc member. The discharge valve of the present invention is also shown in combination with several different types of known suction valves.
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