Valves and valve actuation – With correlated flow path – Valve operated by joining flow path sections
Patent
1980-10-08
1982-09-21
Cline, William R.
Valves and valve actuation
With correlated flow path
Valve operated by joining flow path sections
13761403, 13761416, 285316, 285DIG25, F16L 3728
Patent
active
043503217
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
In a majority of known coupling devices for pressurized fluid conduits, the conduits must first be depressurized before the interacting coupling members can be joined together or separated as a free outflow of medium under pressure always entails unnecessary waste and usually leads to complications in handling said coupling members. At high pressures, the risk for personal injury can also arise occasionally if the conduits are not depressurized. Furthermore, environmental damages can arise in the handling of liquid media.
Considerable risks for personal injury also exist for the known kind of so-called quick coupling intended for pressurized fluid conduits, said quick coupling comprising a casing part and a nipple part. Both are provided with a flow-through channel. The nipple part is designed to be inserted into the casing part flow-through channel in order to open a spring-loaded shut-off valve situated in the latter, thereby opening a flow-through path through the coupling and holding the valve and flow-through path open connecting the two parts to each other. For said latter purpose, the nipple part is releasably engaged in a ball locking device or similar locking device situated in the casing part. The shut-off valve situated inside the flow-through channel of the casing part comprises two interacting valve parts, both of which are axially movable relative each other and the channel under the influence of the nipple part. This is especially true when it comes to the separation of such quick coupling devices used in pressurized air conduits in which one or more hose sections are included and separation takes place without the conduit having been depressurized in advance. The brief thrust of pressure produced by the small amount of outflowing fluid has shown itself to be sufficient to occasionally cause such powerful tossing movements of the released hose ends that persons struck by said ends have even suffered disabling spinal damage.
SUMMARY OF THE INVENTION
Starting from the known type of quick coupling as described above, the purpose of the present invention is to propose a new and improved quick coupling in which the risk for powerful tossing movements of the separated conduit ends is eliminated. This is accomplished by means of one of the separated conduit ends having already been automatically depressurized when separation of the coupling has been initiated and while the interconnected casing and nipple parts of the coupling are still lockingly engaged in each other. The second conduit end is kept under maintained pressure but lacks flow-through connection with the depressurized end.
The purpose of the invention has been primarily achieved by means of one end of the shut-off valve being arranged inside an at least essentially casing-shaped member. This member can be moved along a segment of the wall of the flow-through channel in the casing part 1 in order to function as a slide valve relative to the flow-through openings in the wall. These openings lead to and from the channel segment. The openings leading to the segment are included in the flow-through channel through the coupling. The openings leading from the segment are connected to the immediate surroundings of the quick coupling for pressure evacuation of the interior of the flow-through channel in the casing part when the nipple part is disengaged from said casing part. The flow-through channel input end in the casing part is still under pressure. By means of the quick coupling according to the invention having such a design, a double valve function is obtained in the casing part of the coupling. This function makes it possible to automatically ensure that no tossing movements take place as a result of pressure thrusts arising during separation of the coupling. Furthermore, the coupling is simple from a production viewpoint and is simultaneously sturdy and reliable as regards use. Finally, the shut-off valve part can either be stationarily situated inside the casing-shaped member or also can be axially mova
REFERENCES:
patent: 1580694 (1926-04-01), Smith
patent: 2471237 (1949-05-01), Pasturczak
patent: 2689138 (1954-09-01), Scheiwer
patent: 2727759 (1955-12-01), Elliott
patent: 3466054 (1969-09-01), Berg
patent: 3861645 (1975-01-01), Norton
patent: 4077433 (1978-03-01), Maldaus
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