Fluid handling – Removable valve head and seat unit – Threaded into valve casing
Patent
1993-08-02
1994-12-27
Hepperle, Stephen M.
Fluid handling
Removable valve head and seat unit
Threaded into valve casing
1375992, 25112907, 251282, F16K 3106, F16K 2702
Patent
active
053756231
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a pressure compensated cartridge valve with a valve housing within which a valve stem is axially guided which at one of its ends is provided with a valve cone the sealing surface of which in the closing position engages an annular rim formed at the inside of the housing, whereby an annular chamber provided between valve stem and housing on one side of the annular rim constitutes, by way of a connecting bore, one pressure connection of the valve, and the port chamber of the housing bore receiving the valve stem constitutes a further pressure connection of the valve on the other side of the annular rim, whereby a pressure balancing bore connects the port chamber with a counter pressure chamber in the valve housing, which counter pressure chamber surrounds the end of the valve stem remote from the valve cone.
In cartridge valves in accordance with an unpublished older proposal pressure compensation is obtained by the pressure balance bore extending axially within the valve stem and in this manner connecting the pressure chamber on one side of the valve stem with the counter pressure chamber on the other side of the valve stem whereby the force effect of the operating pressure acting on the valve stem is compensated and the only force required for actuating the valve stem is the force necessary for moving the valve stem. Pressure compensated cartridge valves of this kind cannot be provided with a recoil function because the recoil path would have to extend within the interior of the valve stem which is already occupied by the pressure balance bore.
Therefore, it is an object of the invention to provide a cartridge valve of the kind referred to above which provides for pressure compensation as well as, in one direction, a recoil function. In accordance with the invention this object is accomplished in that the pressure balance bore is extending in the valve housing and that within the valve stem there is provided a channel connecting the annular chamber with the port chamber, the opening of the channel toward the port chamber being closed by a spring biased ball seal or by a spring biased conical seal.
In this manner there is provided a cartridge valve which is of simple and compact structure, yet is pressure compensated and provided with a recoil path. The invention may be used in connection with two position/two way (2/2) valves as well as with two position/three way (2/3) valves and permits free flow in one direction as soon as the biasing force of the spring is overcome by the operating pressure, while the normal two position/two way (2/2) or two position/three way (2/3) function is maintained at the same time.
Preferably the recoil valve function is obtained by providing, preferably in an integrated manner, a perforated cap on the head of the valve stem in front of the opening of the channel, the cap receiving the biasing spring which pushes the ball seal or the cone seal against the opening of the channel. In this manner, the cartridge valve in accordance with the invention may be manufactured without substantial adjustments in the manufacturing tools.
Alternatively, the biasing spring may be arranged within the channel and push the ball seal or the conical seal against an annular rim protruding at the inside of the channel ahead of the opening of the channel. Such a structure would result in a reversal of the flow-through direction of the recoil path, where such a valve function is required.
An especially simple structure of the valve in accordance with the invention is obtained by making the valve receptacle in which the valve is inserted part of the valve structure by arranging the biasing spring within the valve receptacle between its bottom and the head of the valve stem to push the ball seal or the conical seal against the opening of the channel.
A preferred improvement of the subject matter of the invention resides in the counter pressure chamber constituting a third pressure connection of the valve by way of a connecting bore. In this manner, the number of possible applica
REFERENCES:
patent: 3148860 (1964-09-01), Morris
patent: 4825909 (1989-05-01), Martin et al.
patent: 4921208 (1990-05-01), LaMarca
patent: 5056642 (1991-09-01), Bright
patent: 5067687 (1991-11-01), Patel et al.
patent: 5116028 (1992-05-01), Mintgen
patent: 5178359 (1993-01-01), Stobbs et al.
Hepperle Stephen M.
Hormann Karl
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