Valve system for capacity control of a screw compressor and method of manufacturing such valves
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Claims
2. The lift valve as defined in claim 1, further comprising a double shaft seal means formed between said housing and said shaft for preventing fluid in the compressor from entering said housing and preventing fluid from escaping from said housing.
3. The lift valve as defined in claim 1, further comprising mounting means for mounting said valve housing on the compressor in a predetermined position.
4. The lift valve as defined in claim 1, wherein said valve housing is formed of a single unitary cast.
5. The lift valve as defined in claim 1, wherein said valve surface forms substantially a continuation of an inner surface of said compression chamber when said piston is in a fully extended position.
6. The lift valve as defined in claim 5, wherein said valve surface is a concave surface.
7. The lift valve as defined in claim 1, further comprising an alignment means for maintaining a rotational position of said valve surface with respect to said valve housing.
8. The lift valve as defined in claim 7, wherein said alignment means includes a male stud extending from a base of said valve housing, and a cooperating female receptacle formed in said piston for receiving said stud.
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Type: Grant
Filed: Mar 16, 1998
Date of Patent: Aug 24, 1999
Assignee: Coltec Industries Inc. (Charlotte, NC)
Inventors: Jan A. Zuercher (Spanish Fort, AL), John Q. Richardson (Daphne, AL), Arthur R. Legault (Suwanee, GA)
Primary Examiner: John J. Vrablik
Law Firm: Cummings & Lockwood
Application Number: 9/40,268
International Classification: F04C 1816; F04C 2910; F16K 31363;