Constant torque unloader system for a compressor

Details Constant torque unloader system for a compressor Constant torque unloader system for a compressor

2011-06-14

2011-06-14

Kramer, Devon C (Department: 3746)

Pumps

Expansible chamber type

Having separate noncyclic valve

C417S446000, C137S512100

Reexamination Certificate

active

07959420

ABSTRACT:
An unloader system for a reciprocating gas compressor includes an unloader valve assembly which may be installed as the suction valve assembly or the discharge valve assembly of the compressor. The valve assembly includes a valve seat having one or more seat passages formed therethrough and a valve guard having a number of valve members movably mounted thereon equal to the number of seat passages. One of the valve guard and valve seat is rotatable relative to the other. The rotatable member is driven by a constant torque motor or other power source which stalls when a retarding force caused by pressure differentials across the valve members overcomes the torque supplied. Once pressures across the valve members equalize, the rotatable member can resume rotation. A method of unloading a compressor using the unloader system includes selecting a rotational speed for the rotating member to allow backflow.

REFERENCES:
patent: 4043710 (1977-08-01), Bunn et al.
patent: 4445824 (1984-05-01), Bunn et al.
patent: 4447193 (1984-05-01), Bunn et al.
patent: 4737080 (1988-04-01), Owsley et al.
patent: 5331998 (1994-07-01), Sperry
patent: 5695325 (1997-12-01), Sperry
patent: 6361288 (2002-03-01), Sperry

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