DE1055908B - Control valve for the automatic alternating supply and discharge of a gaseous pressure medium in quick succession - Google Patents

Description

In the case of pneumatically operated devices such as B. Ruttel devices and the like, must be known Pressure medium can be supplied and discharged in rapid succession. To make this possible, electromagnetic actuated valves used, which are controlled by a pulse generator. Such impulse valves however, they are prone to failure and not always reliable in continuous operation, quite apart from that from the fact that they are also expensive to buy.

The invention now relates to a control valve for the alternate supply and discharge of a gaseous one Pressure medium to and from a consumer in rapid succession using a servo piston or a servo diaphragm for one closing direction and using a compression spring for the other closing direction by arranging the various individual elements accordingly.

The structure and details of the invention are the one on the drawing schematically in section shown embodiment.

The valve housing 1 is provided at the top with a lid 6 and the bottom with a screw 15 and also has lateral openings for the pressure fluid inlet 2, for the pressure medium 3 and for the consumer terminal 4. Further, an upper valve seat are in the interior of the cylindrical pierced valve housing 1 9 and a lower valve seat 10 is arranged. Between the upper valve seat 9 and the cover 6 there is a servo diaphragm 5, which can also be replaced by a servo piston, so that a working space 20 is created above the diaphragm 5 and an outlet space 23 is created below the diaphragm 5 , to which the pressure medium outlet 3 is connected is. Below the lower valve seat 10 is the inlet space 19 which is delimited by the screw plug 15 and which is in communication with the pressure medium inlet 2.

The slide piston slides in the valve housing 1. 13 up and down. He is on both sides of the valve seats 9 and 10 with an upper locking piece 11 and a lower locking piece 12 is provided. The servo diaphragm (or the servo piston) 5 are fastened above the upper locking piece 11 , while the compression spring 18 is inserted between the lower locking piece 12 and the locking screw 15.

The slide piston 13 has a longitudinal bore 22 which, however, does not go through at its lower end 25 , which is tapered in diameter, but rather merges into an outer bore 16 above this end 25. The upper, on average also tapered, open end 24 of the slide piston 13 protrudes into the working space 20. This is vented through a bore 7 , the venting being able to be regulated from the outside by an adjustable throttle 8.

Between the two locking pieces 11 and 12

Control valve for automatic
alternating supply and discharge
a gaseous pressure medium
in quick succession

Applicant:

Concordia machine and
Elektrizitätsgesellschaft mb H.,
Stuttgart 13, Talstr. 41

Dipl.-Ing. Walter Pelikan, Stuttgart, has been named as the inventor

is the spool 13 with a z. B. provided annular recess 21 , which is in each position of the slide piston 13 in connection with the consumer connection 4 and also alternately the connection with the inlet chamber 19 and the outlet chamber 23 establishes.

The lower closed end 25 of the spool 13 is also designed like a spool valve and protrudes into a non-continuous cylinder bore 14 in the screw plug 15. Through the bottom edge 17 of the cylinder bore 14 , the transverse bore 16 in the end 25 is closed when it is depressed.

The operation is as follows: The gaseous pressure medium, generally air, passes through the pressure fluid inlet 2 19 in the inlet space, the lower stopper 12 of the valve sits, in this position by the pressure of the compression spring 18 on the lower valve seat 10 and closes the inlet space 19 against the consumer connection 4 . The pressure medium now flows from the inlet chamber 19 through the transverse bore 16 and the longitudinal bore 22 into the working chamber 20 via the servomembrane 5. This is consequently pressed down against the pressure of the compression spring 18 and takes the slide piston 13 with it.

During this movement, the closed lower end 25 slides downward in the cylinder bore 14 , so that finally the outer bore 16 is closed by the end edge 17 and no pressure medium can get into the working space 20. There

90Ϊ 507/314

Claims (2)

but the pressure medium in the working space 20 continues to expand at this moment, the upper closure piece 11 closes the upper valve seat 9, so that the outlet space 23 is separated from the consumer connection 4, and at the same time lifts the lower closure piece 12 from the lower valve seat 10 from, so that the pressure medium now passes from the inlet chamber 19 via the lower valve seat 10 to the recess 21 and thus to the consumer connection 4. During this process, the pressure medium located in the working chamber 20 slowly escapes to the outside via the throttle 7, 8. The pressure in the working chamber 20 is therefore reduced, so that the spring 18 pushes the slide piston 13 upwards again. During this movement, the lower valve seat 10 is first closed again by the lower closure piece 12 and the upper valve seat 9 is opened again by the upper closure piece 11, so that the pressure medium in the consumer connection 4 is via the recess 21 and the outlet space 23 can relax outward. In the meantime, the transverse bore 16 has also become free again due to the upwardly giving slide piston 13, so that the original starting position of the control valve is reached again and the working process automatically begins anew. The rhythm of the alternating opening and closing of the control valve is set by the throttle 7,8. In this way, automatic, reliable operation of the control valve is achieved without additional devices, the supply and discharge of the pressure medium to the consumer device taking place in a rapid sequence that can be set according to the respective needs. Another advantage of the subject matter of the invention is that no losses of the pressure medium occur, as is the case, for. B. is the case with a known embodiment, which works as a pulsator for negative pressure in conjunction with a vacuum system with four valve seats for several consumer points, which are connected to one another by a thin valve rod. Such a design cannot be used for pressurized gaseous pressure medium, quite apart from the fact that a perfect fit of the closure pieces cannot be guaranteed either. In the case of pulse valves operating in rapid succession, however, the avoidance of leakage losses is of decisive importance, which is achieved in a simple manner in the design according to the invention by the slide piston in connection with the other elements of the valve without the use of special control means. A particularly fine control of the pulses can be achieved if the upper end 24 of the slide piston 13 is designed in the same way as its lower end 25. In this case, the longitudinal bore 22 is also at the upper end 24 of the slide piston 13 z. B. closed by a screw plug and provided with a transverse bore, the upper end 24 slides in the manner of a piston valve into a corresponding cylinder bore in the cover 6 or in the valve housing 1. It is also easily possible to replace the servo diaphragm with a servo piston. If the part 13 is not designed in the manner of a slide, the control valve also works, but not reliably enough, because the pressure of the pressure medium and the cross section of the pressure medium inlet must then be in a very specific relationship to one another. P A T E N T Λ Ν "S V R C C FI E. 1. Control valve for the automatic alternating supply and discharge of a gaseous pressure medium to and from a consumer in rapid succession using a servo piston or a servo diaphragm for one closing direction and a compression spring for the other closing direction, characterized by a slide piston (13) with one after the consumer connection (4) opening recess (21) for alternating connection with the inlet (2) and the outlet (3) of the pressure medium as well as with a longitudinal bore (22) closed at the bottom, which via a transverse bore (16) at its tapered lower end ( 25) is in communication with the inlet (2) and with its tapered upper open end (24) protrudes into the working space (20) located above the SerAO piston or the servo diaphragm (5) , which is connected by an adjustable throttle (7, 8) the atmosphere is connected, while the outlet space (23) located below the servo piston or the servo diaphragm (5 ) with the pressure medium outlet (3) durc h an upper closure piece (11) is in lockable connection, and that the compression spring (18) in the inlet space (19) between a lower, the connection between the inlet (2) and the consumer connection (4) locking piece (12) and a screw plug (15) of the valve housing (1) is inserted, which has a non-continuous cylinder bore (14) for receiving the closed end (25) of the slide piston (13) and with its inner end edge (17) when the slide piston (13) is depressed Cross hole (16) closes. 2. Control valve according to claim 1, characterized in that the upper open end (24) of the slide piston (13) is closed and provided with a transverse bore and slides in a corresponding cylinder bore in the cover (6) or in the valve housing (1) . Considered publications:
German Patent No. 762 584;
British Patent No. 9508 from 1913; British Patent Nos. 471320, 529 061;
U.S. Patent No. 2,610,819. 1 sheet of drawings © 909 507/314 4.59