Valves and valve actuation – Fluid actuated or retarded – Pilot or servo type motor
Patent
1990-07-16
1992-04-28
Cohan, Alan
Valves and valve actuation
Fluid actuated or retarded
Pilot or servo type motor
251 611, F16K 31365
Patent
active
051080672
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a diaphragm valve with an elastic diaphragm, which is penetrated by at least one balance hole, braced sealingly on the side of the rim by a valve cover, and which closes a pressure vessel and can be moved by setting the pressure on both sides between the valve cover and the mouthpiece of an exhaust pipe; in the closed state said diaphragm valve abuts the mouthpiece sealingly and in the opened state is bent due to the excess pressure on its side toward the valve cover facing away from the valve cover, wherein in the opened state a hole, opposite the diaphragm, in the valve cover is opened by a control valve and is closed in the closed state so that the pressure in the pressure vessel acts on one side of the diaphragm only when the control valve is open and lifts said diaphragm from the mouthpiece.
Such a diaphragm valve is known from DE OS 33 03 003. To give the diaphragm of this diaphragm valve adequate play, the valve cover has a recess which encloses the hole in the valve cover and passes over into a prominence that extends like a ring relative to the valve cover surface adjoining it. This annular prominence on the valve cover pushes in the closed state of the diaphragm valve the diaphragm against the mouthpiece of the exhaust pipe, whereas in the opened state due to the hole in the valve cover that is opened by the control valve the pressure in the pressure vessel pushes the diaphragm into the recess, thus lifting the diaphragm from the mouthpiece.
The invention is based on the problem of simplifying the construction of the diaphragm valve under discussion, which must be addressed as a mass-produced article. This problem is solved by the invention in that the valve cover is designed on its side facing the diaphragm as a substantially flat plate and the diaphragm on its side facing the valve cover is provided with a projection arranged coaxially to the mouthpiece, around which projection the diaphragm bends or straightens out when opening and closing.
Since the diaphragm is designed with the coaxial projection, the clearance of motion to be given to the diaphragm is shifted away from the valve cover so that the valve cover can be designed as a flat plate, a feature which represents a significant simplification of the design of this part. The special design of the diaphragm does not play a role, since this diaphragm is a moulded part made of an elastic plastic or rubber that is to be extruded or vulcanized in the typical manner and for whose manufacture an adapted shape is necessary in every case.
Various possible designs exist for the projection included in the diaphragm. Thus, the diaphragm can be provided on its side facing the valve cover with a projection around which the diaphragm bends or straightens out when opening and closing. In this case the projection forms simultaneously the seal of the diaphragm relative to the valve cover. However, it is also possible to design the projection in the shape of a collar so that due to the pot wall the result is a space between the actual diaphragm and the surface of the valve cover facing said diaphragm.
Preferably the diaphragm has in the region of the mouthpiece a reinforcement, wherein the region exploiting the elasticity of the diaphragm material is displaced outwardly radially away from the mouthpiece. In the region of the mouthpiece, the diaphragm can abut without bending and seal said mouthpiece.
Embodiments of the invention are shown in the figures.
FIGS. 1 and 2 shows a diaphragm valve in which the diaphragm is provided with a torus, and in particular in the closed and opened state.
FIGS. 3 and 4 show a diaphragm valve with a diaphragm, which has a projection designed like a collar, and in particular also in the closed and opened state.
The diaphragm valve shown in FIG. 1 comprises valve cover 1 and elastic diaphragm 2, which is braced on the rim of valve cover 1 and fastened here by means of attachment elements, which are indicated by the dashed-dotted lines 3 and 4. It can also involve continuous screws, which penetrate rim
REFERENCES:
patent: 2882929 (1959-04-01), Churchill
patent: 3022039 (1962-02-01), Cone
patent: 3495803 (1970-02-01), Schoepe
patent: 3763881 (1973-10-01), Jones
patent: 3889711 (1975-06-01), Hiaro
patent: 4244554 (1981-01-01), DiMauro
patent: 4295488 (1981-10-01), Book
patent: 4561627 (1985-12-01), Meckstroth
patent: 4721133 (1988-01-01), Sundblom
patent: 4848722 (1989-07-01), Webster
patent: 4860990 (1989-08-01), Fukuzawa
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