Fluid handling – Removable valve head and seat unit – Threaded into valve casing
Patent
1993-05-25
1995-06-13
Hepperle, Stephen
Fluid handling
Removable valve head and seat unit
Threaded into valve casing
137102, 1376142, 251 3004, F16K 3106, F16K 3140
Patent
active
054233470
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a threaded insertion valve having a substantially tubular threaded insertion part provided with an external thread to be screwed into a valve receptacle and a flanged part adjacent to and integral with the threaded insertion part which is provided with a central bore to be penetrated by a valve spindle.
Known valves of the kind (cartridge valves) are designed for a particular field of application and for a defined function. Hence, there exist a great many valve types for fluids designed as cartridge valves such as hydraulic or pneumatic servo and control valves. It is necessary for each kind of valve to manufacture a basic valve body consisting of a threaded part and a flanged part into which valve spindles, valve seat bodies or valve spindle actuators, as the case may be, are inserted. On the part of a manufacturer, such valves place a high burden of conversion when changing production from one kind of valve to another, on the part of a supplier such valves place a burden of a large inventory stock, and on the part of a customer the valves place a great burden of logistics in the design of appropriate valve control circuits. On the other hand, the different insert dimensions of the basic valve bodies required for different kinds of valves complicate the design and layout of valve control circuits incorporating threaded insert valves. Finally, the assembly of the known valves is accomplished in part by brazing or welding individual valve parts together; more particularly, conventional valve spindle actuators are brazed to the flange part of the valve so that a replacement of defective functional elements is no longer possible without destroying the valve.
It is an object of the invention to provide for a threaded insert valve of the kind referred to which, having non-varying standardized external dimensions, may perform different functions of conventional threaded insertion valves without requiring elaborate conversions, and which ensures a simple assembly, as well as easy exchange of those elements required to convert the valve to accommodate predetermined functions.
In accordance with the invention the object is accomplished either by the bore of the flanged part being provided with an internal thread for receiving a substantially tubular housing of an actuator provided at one end with an external thread and axially acting upon the valve spindle and/or by the threaded insert part having an internal thread for threadedly receiving an exchangeable substantially tubular valve seat module.
In accordance with the invention, there is provided a base module for a threaded insertion valve which is capable of receiving different valve actuating apparatus and valve spindle/valve seat module arrangements, the exterior configuration and the external dimensions of the threaded insertion part and of the flanged part being the same for each functional kind of threaded insertion valve and the valve function elements being exchangeable in a simple manner. Because of the modular division of the threaded insertion valve in no more than four threaded elements, viz.: the actuator, the flanged and threaded insertion valve body parts, the valve seat body and the valve spindle, any required kinds of valves may be put together in a modular fashion.
Since in practice it is not usually necessary to provide flanged and threaded insertion parts in different dimensions, the structure of the threaded insertion valve may be simplified and, consequently, the burdens of inventory and logistics in respect of the basic elements may be reduced, if as taught by the instant invention the choice of parts needed to be combined is reduced to three.
Another object of the invention is, by a further development of the valve module elements defining the valve function, to structure the threaded insertion member described above in such a manner that the basic functions for the drive of the lifting cylinder are already integrated in this valve. This object is accomplished by characteristics of a change-over valve which also fu
REFERENCES:
patent: 4023586 (1977-05-01), Nemetz et al.
patent: 4592533 (1986-06-01), Guglielmi et al.
patent: 4723640 (1988-02-01), Beck
patent: 4725039 (1988-02-01), Kolchinsky
patent: 5172724 (1992-12-01), Tsuzuki et al.
Hepperle Stephen
Hormann Karl
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