Plug-style air-conditioning service valve

Details Plug-style air-conditioning service valve Plug-style air-conditioning service valve

2006-05-30

2006-05-30

Look, Edward K. (Department: 3751)

Valves and valve actuation

Rotary valves

Plug

C251S314000, C137S382000

Reexamination Certificate

active

07051996

ABSTRACT:
In a plug-style valve, such as an air-conditioning service plug-style valve, basically including a valve body, a stem, a retainer including a service fitting and a valve core, and a cap, the plug including an intermediate O-ring, between the valve body and the plug, disposed in an intermediate O-ring seal groove of a serpentine shape and having integral first and second O-ring groove portions, the intermediate O-ring being stretched a predetermined amount during installation and defining, therebetween and the valve body and the plug, a closed volume without a primary lateral passage in the plug, with the O-ring stretching preferably being in excess of about 15% to offset refrigerant medium absorption effects that will cause the O-ring to swell, become too large and become loose within its retaining groove, with the single cap including a redundant seal that covers both the valve actuation stem and the service fitting

REFERENCES:
patent: 3186437 (1965-06-01), Buono
patent: 3783890 (1974-01-01), Wurzburger
patent: 3802457 (1974-04-01), Wurzburger
patent: 4262880 (1981-04-01), Danko et al.
patent: 5219149 (1993-06-01), Combeau
patent: 5234193 (1993-08-01), Neal, Jr. et al.
patent: 5372158 (1994-12-01), Berfield
patent: 6216473 (2001-04-01), Arii
patent: 6546952 (2003-04-01), Martin et al.
Parker Instrumentation Catalog 4126-PR entitled “Rotary Plug Valves (PR Series)”, revised Mar. 2002.

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