Fluid handling – Systems – Multi-way valve unit
Patent
1980-03-10
1982-11-02
Michalsky, Gerald A.
Fluid handling
Systems
Multi-way valve unit
13762418, F15B 13042
Patent
active
043568424
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a pneumatically operated control valve for a fully pneumatic low-pressure and actuating-pressure control system, especially for transmitting signals, or for the timed control and sequential control of pneumatic or hydropneumatic machines, this control valve having the features which follow:
(a) A valve-slide is located in a valve housing, which has one inlet passage for compressed air, at least one venting passage, two outlet passages, and two control input passages, this valve-slide being intended to effect the alternate connection of the outlet passages to the inlet passage, and to the venting passage;
(b) the valve-slide is capable of being shifted between two stitching positions, which are secured by means of resilient latching devices, the valve-slide being shifted by applying control pressure to its ends;
(c) a valve is located, in each case, in the control input passages, this valve opening or closing the control input passage in question, in accordance with the pressure;
(d) that portion of each control input passage which lies between the valve and the valve-slide is capable of being vented via a non-return valve.
A control valve of the aforementioned type has been disclosed in German Auslegeschrift No. 1,653,525. This publication discloses a rapid-switching 4/2-way valve, with a snap-action or latching device, this control valve having control lines which, in each case, possess a pressure valve, and which can be rapidly vented via non-return valves.
The known arrangement is designed for an oscillatory control system, and cannot be used for a sequential control system, or for a timed control system.
In contrast to this known arrangement, the object underlying the present invention is to improve the control valve of the type initialling mentioned in such a manner as to allow the switching frequency of the control valve to be increased, to obtain a highly reproducible switching action, to enable, in comparatively large control systems, several identical control valves to be connected together more simply, and without auxiliary valves, while allowing the control valve to be operated both automatically and manually. This object is achieved, according to the invention, by means of the following features:
(e) the valves are normally open, and close when the difference between the pressure prevailing upstream and downstream of the valve in question exceed a prescribed value;
(f) the non-return valve of the control input passage, to which pressure is to be admitted in order to switch the valve-slide, is connected to the outlet passage which carries pressure prior to the switching-over operation, while the non-return valve of the other control input passage is connected to the outer outlet line.
It is possible to increase the switching frequency as a result of the rapid venting of the control input sections immediately following the switching-over of the valve-slide, while the switching frequency can be proportionately increased only by increasing the pressure at the inlet passage of the control valve, provided that the control valve is fitted out as a 5/2-way valve, and is connected, via an operating valve, to a double-acting cylinder. The control valve can quickly be assembled with valves of the same type to form a pneumatic control system, only one connecting hose between two similar control valves being necessary for each functional phase.
In a further development of the invention, the valve-slide can possess a manual operating device, an AND-gate being connected upstream of each control input passage, the control pressure being presented at one input passage of this AND-gate, and a pressure-signal, which can be removed for the purpose of manual operation, being present at the other end of this AND-gate.
An illustrative embodiment of the invention is represented in the drawing, in which:
FIG. 1 shows a central longitudinal section through a control valve, the representation being partially diagrammatic, and
FIG. 2 shows an AND-gate.
In a valve housing 100, the control valve, sh
REFERENCES:
patent: 2773486 (1956-12-01), Albers
patent: 3429327 (1969-02-01), Wright
patent: 3592230 (1971-07-01), Piroutek
patent: 3707982 (1973-01-01), Hogel
Michalsky Gerald A.
Wirz Ernst
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