Universal valve core removal tool and kit

Details Universal valve core removal tool and kit Universal valve core removal tool and kit

2000-08-09

2001-07-03

Hail, III, Joseph J. (Department: 3723)

Metal working

Means to assemble or disassemble

Valve applying or removing

C029S890121, C029S237000

Reexamination Certificate

active

06253436

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates generally to a tool for removing valve elements, and more particularly to a tool for removing valve elements from pressurized air conditioning systems.
BACKGROUND OF THE INVENTION
It is a common practice when servicing a pressurized refrigeration system to remove and replace threaded valves without depressurizing the system by removing or losing the refrigerant gas. Environmental concerns have added greater emphasis on the efficiency of this process. The pressures typically encountered in such systems vary from 75 p.s.i. to 250 p.s.i. or higher. The valve cores and thread sizes etc. are standardized (although there are a variety of standards), making it possible to attach a standard tool to the valve fitting, through which the valve core can be passed, after which the passage through the tool is closed. A high quality sealing mechanism is crucial to maintain pressure when the core is removed, and the need to open an access way to the core complicates matters.
It is known that valve cores, such as the Schrader-type used in refrigeration systems are typically not subject to high quality control. Resulting in a significant number valve cores that are initially installed in refrigeration systems being incapable of maintaining the proper operating pressure to permit efficient operation of the refrigeration system. Additionally, refrigeration systems, while they arc intended to be closed (sealed) systems, are actually made from a number of other components, with various fittings and seals, subject to leakage. It is necessary to repair and recharge the refrigeration systems in an efficient way, such as through the removal of the core valve, thus providing access for refrigerant removal, system evacuation and recharge. The removal of the core valve, which is under high pressure, will tend to blow out the core valve, until the interior pressure of the tool is equalized.
Such needs, together with the substantial operating pressures make it necessary to provide a device of great precision as well as very sturdy construction. The tools typically used for this purpose have been of relatively complicated construction, making them prone to leak, and/or less dependable and thus expensive to manufacture than necessary.
Accordingly, there is a need for a tool for efficiently and safely removing valve elements from pressurized air conditioning systems.
SUMMARY OF THE INVENTION
The present invention is a tool for a pressurized refrigeration system having a valve with a removable valve core. The tool comprises: a valve assembly having a first opening and a second opening and a shut-off valve, the shut-off valve adapted to close and open a passageway between the first opening and the second opening; a valve adapter coupled to the first opening, wherein the valve adapter is adapted to couple to the valve; and, a shaft assembly coupled to the second opening, the shaft assembly having a shaft adapted to move through the passageway, when the shut-off valve is open, and engage the removable valve core. The removable valve core can be removed, while under pressure, from the valve, by rotating the shaft to extract the removable valve core in a controlled manner.


REFERENCES:
patent: 2517870 (1950-08-01), Gump
patent: 3935713 (1976-02-01), Olson
patent: 4305193 (1981-12-01), Anderson
patent: 4550481 (1985-11-01), Preston
patent: 4563803 (1986-01-01), Dimoff
patent: 4597147 (1986-07-01), Henry
patent: 4599776 (1986-07-01), Haggard et al.
patent: 4706357 (1987-11-01), Ewing
patent: 5228178 (1993-07-01), Stickley
patent: 5472011 (1995-12-01), St. Marie
patent: 5842260 (1998-12-01), Todd, III et al.
patent: 5915740 (1999-06-01), Weitner

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