DE1045195B - Self-acting valve arrangement for controlling and throttling the inflow and return of a pressure medium to or from a working device - Google Patents

Description

GERMAN

The invention relates to an automatically acting valve arrangement for controlling and throttling the Supply or return of a pressure medium to or from a working device, consisting of a displaceable Control and throttle element as well as a coaxially arranged check valve on each the two end faces of the control and throttle element. Its purpose is to simplify the known Devices of this type.

It consists in the fact that the control and throttle element is designed as a sleeve that is longitudinally displaceable for control and rotatable for throttling in is arranged in their housing. This bushing has a sealing surface on one of its faces, which with cooperates with a seat inserted into the housing. This sealing surface also serves as a seat for the first check valve which is arranged in an axial bore and when the control valve is closed Enables access to the consumer. The second check valve located on the other end of the sleeve releases the return from the consumer when the control valve is open. Next carries the Bushing longitudinal channels that are connected to the control valve via longitudinal channels in the housing and at Return flow can be released through the second check valve.

The invention is shown in its basic principle by Figs. 1 and 2, the

Fig. 1 a section in the direction of the longitudinal axis and the

Fig. 2 shows a cross section in the direction of the section line xy . the

AbI). 3 shows a design modification in which a two-part housing is used in place of the one-piece housing. In

Fig. 4 is the scheme of a system with the inventive Valve arrangement shown.

The valve arrangement has a housing 1, a check valve 5 inserted therein, a concentrically arranged one Control and throttle element in the form of a sleeve 4 and the annular check valve 7.

The valve arrangement works as follows:

The pressure medium conveyed by a pump passes through the connection 2 of the threaded ring 3 and gets into the axial bore 4 'of the sleeve 4, being supported by the force of the valve spring 7', the check valve 7 presses against the lower end face of the sleeve 4, so that the cross-over Longitudinal channels 8 are tightly closed. The bushing 4 is counteracted with the front sealing surface 10 ' the seat 10 pressed. At the same time the check valve 5 is opened and against the surface 1 'of the housing 1 printed. In doing so, its outlet opening becomes an automatically acting valve arrangement

for controlling and throttling the supply

or return of a pressure medium

to or from a work facility

Applicant:

Frankfurter
Mechanical engineering corporation

vorm. Pokorny & Wittekind,
Frankfurt / M.-West, Solmsstr. 2-26

Maurus Glas, Frankfurt / M.,
has been named as the inventor

gene 5 'exposed so that the pressure medium passes through this to the consumer connection 11 or 11'.

In order not to allow the approach of the working piston 18 (Fig. 4) to take place intermittently, the outlet openings 5 'are arranged in a helical manner, so that the The medium escapes slowly depending on the clearance of the openings and the acceleration is not sudden, but gradually goes on.

As soon as the movement of the piston 18 has ended and the switchover valve 21 is used to switch over is, the returning pressure medium closes the check valve5 and presses on the upper face the sleeve 4, the sealing surface 10 'lifts from the seat 10 of the control valve and the passage for the Releases pressure medium via the longitudinal channel 12 in the housing 1 into the longitudinal channels 8 of the sleeve 4, whereupon the Check valve 7 is opened.

In order to allow the entry of the pressure medium for reasons of a simplified pipe assembly also on another To enable location of the housing 1, this is provided with a second inlet opening 17, which otherwise is closed by means of a threaded plug 13. In this case, the pressure medium flows through the annular groove 14 and through the radial bores 15 arranged in the sleeve 4, which are located between the longitudinal channels 8 are arranged, in the axial bore 4 'of the sleeve 4 and further to the connection 11 or 11'.

In the lower part of the housing 1 an opening 16 is made, through which one on the outer casing the sleeve 4 arranged scale 16 'to

«09 6S0 / J14

reading the positions of the sleeve 4 can be observed. The rotation of the sleeve 4 is done by means of Pins that are inserted into the pin holes 25. This rotation creates the throttling effect a screw surface 10 "is set.

In the embodiment according to Fig. 3, the housing is divided into two parts, of which the part 26 with With the help of a union nut 28 is placed on the part 27.

In the system diagram shown in FIG. 4, there is a pump 20 sucking in from the collecting vessel 19 illustrates, which presses the pressure medium pumped into the switching valve 21, from where it passes through a line is passed into the valve arrangement 22 according to the invention, from there against the in the working cylinder 24 located working piston 18 to be performed. During the return, the piston 18 moves in motion set medium into a further valve arrangement 23 connected into the return line, from which it flows via the switching valve 21 into the collecting vessel 19.

Claims (7)

Patent claims: 1. Self-acting valve arrangement for controlling and throttling the supply and return flow a pressure medium to or from a working device, consisting of a displaceable Control and throttle element as well as a coaxially arranged check valve on each of the two end faces of the control and throttle element, characterized by the following features: a) The control and throttle element is designed as a bushing (4) which is used for control along the length is arranged displaceably and rotatably for throttling in its housing (1). b) The bushing (4) has a sealing surface (10 ') on one end face, which is connected to the Housing (1) inserted seat (10) cooperates. c) The sealing surface (10 ') also serves as a seat for the first check valve (5), which is in a axial bore (4 ') is arranged and when the control valve (10, 10') is closed, the inlet to the Consumer (18, 24) releases. d) That on the other. The second check valve (7) arranged on the front side of the bushing (4) is included open control valve (10, 10 ') the return (11, 10, 10 ', 12, 8, 2) free. e) The bush (4) carries longitudinal channels (8) which are connected to the control valve (10, 10 ') via longitudinal channels (12) in the housing (1) and which are released through the second check valve (T) when the return flow occurs. 2. Valve arrangement according to claim 1, characterized in that the connections (2, 11) for the Pressure medium source (20) and the consumer (18, 24) are axially opposite one another. 3. Valve arrangement according to claim 1, characterized in that the connections (17, Hj for the pressure medium source (20) and / or the consumer (18, 24) are arranged radially. 4. Valve arrangement according to claim 3, characterized in that the connection from the terminal (17) to the connection (11) via an annular groove (14j of the bushing (4), radial bores (15) in the same, the axial bore (4 '), the longitudinal channels (8, 12) and a radial opening (H') of the Seat (10) takes place. 5. Valve arrangement according to one of the preceding claims, characterized in that the second check valve (7) is under spring pressure (7 ') in the closing direction. 6. Valve arrangement according to one of the preceding claims, characterized in that the throttling is carried out by a screw surface (10 ") on the first end face of the sleeve (4), the sick! extends concentrically around the sealing surface (10 '). 7. Valve arrangement according to one of the preceding claims, characterized in that the rotation of the bushing (4) for throttling takes place by means of pins that pass through a housing opening (16) can be inserted through the pin holes (25) of the bushing (4). Considered publications:
German Patent No. 863 580;
French Patent No. 955 596;
U.S. Patent Nos. 2,483,312, 2,500,627. 1 sheet of drawings © «09 680/314 11.58 ·