Fluid handling – With repair – tapping – assembly – or disassembly means – Removable valve with normally disabled supplemental check valve
Patent
1996-02-22
1998-08-04
Walton, George L.
Fluid handling
With repair, tapping, assembly, or disassembly means
Removable valve with normally disabled supplemental check valve
13761419, 1376142, F16K 4300, F16K 1518
Patent
active
057879214
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a gas container valve for a container for liquified gas comprising a valve housing with a detachably mounted bushing with a valve seat, an elongate valve body which is displaceable in a bore in the valve housing, said valve body comprising a valve head, a valve spring biassing the valve body against the valve seat in the outflow direction of the gas, and a second valve seat and valve head placed upstream of the valve seat and the valve head.
A gas container valve of this type is known from EP-A1-0 018 121 corresponding to DK Patent Application No. 1516/79. In this known gas container valve the valve seat and the valve head may be removed for replacement or repair purposes without any need for emptying the container of gas, as the container may be closed by means of a second valve positioned up-stream of the first valve, said second valve being in this case manually operated. This gas container valve suffers from the substantial drawback that it is expensive to manufacture and is liable to damage during handling of the container for liquified gas. Furthermore, it has the drawback that the detachably mounted bushing, in which the valve seat is located, also contains the valve body with valve spring and abutment therefor, which for a replacement of the valve head entails dismantling of said parts with a subsequent reassembling, which is labour-consuming.
EP-A2-0 098 914 discloses a double seal valve for filling pressurized tanks. The valve contains two separate valve units each having a valve seat, a valve head and a valve spring. The valve unit adjacent to the tank is arranged to open after the other valve unit opens and to close before the other valve unit closes.
DK Patent No. 112.696 discloses a gas container valve, in which two detachable bushings are placed one after the other, each having a valve aggregate comprising valve seat, valve head, valve spring, and abutment for the valve spring. This gas container valve is expensive to manufacture and requires like the aforementioned gas container valve much labour in connection with dismantling and replacement of damaged valve parts.
U.S. Pat. No. 4,120,314 discloses a hydraulic activation valve, in which valve seat, valve head, valve spindle and valve spring are contained in a unit, which may be screwed into the valve aggregate. The individual parts are, however, assembled in the bushing in such a way that they cannot be replaced, and it is necessary to discard all parts if the valve becomes leaky.
It is the object of the invention to provide a gas container valve which allows the repair of a leaky gas container valve, without the gas container having to be emptied first of gas, and in which the valve does not suffer from the above-mentioned drawbacks.
This object is met according to the invention by a valve of the type stated by way of introduction, said valve being characteristic in that the first valve head is detachably mounted on the valve body, that the second valve head is mounted on the valve body, that the valve spring is positioned between the first and the second valve heads, one end engaging an abutment in the bore of the valve housing and the other end engaging the valve body that the valve unit formed by the second valve seat and the second valve head is open when the bushing is mounted in the valve housing, and in that the valve spring brings the second valve head to sealing contact with the second valve seat, when the bushing has been dismantled.
Dismantling of the bushing results in the valve body being free to displace itself in the outflow direction of the gas under bias of the valve spring, until the second valve head at the end of the valve body facing the gas container abuts against its valve seat and consequently impedes gas in the container from flowing out. It is then possible to replace the first valve head and/or the bushing and to assemble the gas container valve again without having to empty the container of gas first. The first valve head is detachably mounted on the valve body and by dismantling the de
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Kosan Teknova A/S
Walton George L.
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