By-pass valve for heat exchanger

Details By-pass valve for heat exchanger By-pass valve for heat exchanger

2009-04-23

2011-12-27

Fox, John (Department: 3753)

Valves and valve actuation

Biased valve

Springs and spring retainers

C251S011000, C165S297000, C236S09300A

Reexamination Certificate

active

08083209

ABSTRACT:
A valve that includes a housing defining first and second bores having a central axis, and a peripheral valve seat. An actuator is located in the first bore and has a reciprocating seal disposed for movement along the central axis for engaging the valve seat and closing the valve. A coiled return spring is mounted in the housing for urging the reciprocating seal towards the chamber to open the valve, the return spring having a first end connected to the reciprocating seal and a second end engaging a spring support in the housing facing the first bore. The return spring may have a larger diameter at its second end than its first end. The housing may include a third bore in communication with the second bore and having a different cross-sectional area than the second bore. The return spring could be supported by a discrete spring support located in one of the bores.

REFERENCES:
patent: 2444711 (1948-07-01), Shaw
patent: 3955595 (1976-05-01), Modes
patent: 4190198 (1980-02-01), Casuga et al.
patent: 5791557 (1998-08-01), Kunze
patent: 6253837 (2001-07-01), Seiler et al.
patent: 6772958 (2004-08-01), Lamb et al.

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