DE4030159A1 - Flow regulating valve with circular gap forming throttle - has piston responding to pressure difference to control orifice under spring pressure - Google Patents

Abstract

A flow regulating valve has an inlet (10) and outlet (11) with a sliding piston (1) located in-between. The outer surface of the piston is sealed relative to the bore by an O-ring (3). Fluid passes through the centre of the piston and enters the outlet by passing across an annular seat formed by flexible material (9). As the pressure at the inlet increases the piston moves against an opposing spring and the flow path is reduced to maintain the flow constant as the pressure difference increases. ADVANTAGE - Can be simply mfd.

Description

The invention relates to a flow control valve according to the Preamble of claim 1.

Known flow control valves are constructed so that the Piston is very precisely adapted to the bore and one has precisely machined control edge, which at Control activity via a radially open into the hole pushes the outlet, the mouth of which is also very pre zis must be designed as it limits the Control serving variable throttle forms.

Such precise processing is very laborious and expensive.

The object of the present invention is to create a flow control valve by its on construction allows an inexpensive and simple manufacture.

This task is characterized by the characteristics of claim 1 fulfilled.

The principle of the invention is therefore that variable choke formed by an annular gap between the outlet-side piston circumference and an oblique ring surface on the outlet-side forehead side exists. This ring surface can be of a conical taper the bore or an O-ring be formed, which is special as a commercially available part is inexpensive.

Further advantageous features result from the Be Description of three embodiments based on Drawings.

It shows:

Fig. 1 tion a flow control valve with a tapered Boh,

Fig. 2 is a flow control valve with O-ring,

Fig. 3 shows another Ausgestal device according to the invention of the axial throttle device.

Corresponding to each other in the different drawings Elements are provided with reference numerals, which are around distinguish an integer multiple of 100.

The flow control valve according to Fig. 1 has between the inlet 10 and the outlet 11 a piston 1, which is sealed against the wall of the bore 2 with the O-ring 3 and is provided with the central throttle bore 4. On the end wall 6 , which is formed by the cover 8 , the compression spring 5 is supported, which holds the piston 1 at rest on the end wall 7 in the rest position. A tapering of the bore 2 is achieved here by the bevel 13 on the cover 8 . In the radial region of the rule edge 12 of the piston 1 , the embedding 9 of a ductile or elastic material such as metal, rubber or plastic is provided in the bevel 13 , which can be adapted when using metal of the rule edge 12 of the piston 1 in that in each case a piston and a cover, which are intended for the same valve, pressed together during assembly under the action of an axial force and thereby rotated against each other. This means that very precise machining of the control edge and the chamfer during production can be dispensed with. The housing 15 has the caulking 14 to secure the cover 8 .

If pressure is built up from the inlet 10 , pressure medium flows through the throttle 4 into the space 16 , from where it can initially emerge unhindered through the outlet 11 . The throttle 4 creates a pressure difference between the inlet pressure p 1 and the pressure p 2 in the space 16 . When a certain value of the compression spring 5 is exceeded, the piston 1 moves into the control position shown in dashed lines, the annular gap between the control edge 12 of the piston 1 and the embedding 9 forming the variable throttle used for regulation.

The operation of the valve shown in Fig. 2 is the same as in Fig. 1. Therefore, only A details are described that distinguish this valve from that in Fig. 1.

Instead of a bevel on the cover 108 , an O-ring 109 is inserted into a radial extension 116 , which cooperates with the control edge 112 . Here, too, the throttle is of constant cross-section centrally in the piston 101 , but it is formed by two pot-like metal parts 117 and 118 placed one behind the other, the narrow passages 104 and 104 'sitting centrally in the bottom.

In Fig. 3 the constant throttling takes place at the Kolbenum. For this purpose, the piston 201 is provided with circumferential ribs 219 which are adapted to the bore wall, so that the pressure medium can flow along the piston 201 in a throttled manner.

Reference symbol list

1 piston
2 holes
3 O-ring
4 throttle bore
5 compression spring
6 end wall
7 end wall
8 lids
9 embedding
10 inlet
11 outlet
12 standard edge
13 bevel
14 caulking
15 housing
16 room
104 passage
104 ' passage
108 cover
109 O-ring
116 extension
117 metal part
118 metal part
201 pistons
219 ribs

Claims (8)

1. flow control valve, which has a piston with an axia len throttle device in a housing bore limited by two end walls between an inlet and a substantially radially extending outlet, which is struck from the outlet side by a compression spring and in the control position to the outlet side end is moved out, characterized in that there is a conical taper on the outlet-side end face of the bore ( 2 ), the inner diameter of which is smaller than the outer piston diameter, and that the piston ( 1 ) with its outlet-side circumference ver ver to create recent section ( 13 ) sealingly ver. 2. Flow control valve according to claim 1, characterized in that in the tapered section ( 13 ) of the bore ( 2 ) in a radial region, which includes the outlet-side piston diameter, metal, plastic or rubber with a smooth surface is embedded in a form-fitting manner. 3. Flow control valve according to one of the preceding claims, characterized in that the tapering section ( 13 ) is located on a housing cover ( 8 ). 4. Flow control valve according to one of the preceding claims, characterized in that the tapered section ( 13 ) of the re gel edge ( 12 ) of the piston is adapted to the fact that during assembly under the action of an axial force of the piston and the bevel pressed against each other and thereby against each other be twisted. 5. flow control valve, which has a piston with an axial throttle device in a housing bore delimited by two end walls between an inlet and a substantially radially extending outlet, which is acted upon from the outside by a compression spring and which is shifted into the control position toward the outlet end side is characterized in that a ring ( 109 ) with a substantially round profile made of elastomeric material is inserted into an annular radial recess ( 116 ) of the bore ( 102 ) on the outlet-side end face, the inside diameter of which is smaller than the outside diameter of the piston ( 101 ) and its average diameter is larger than the outer diameter of the piston ( 101 ), and to which the Kol ben ( 101 ) with its outlet-side circumference is able to create you tend. 6. Flow control valve according to one of the preceding claims, characterized in that the piston ( 1 , 101 ) is sealed against the bore wall by a sealing ring ( 3 ) inserted into an annular groove in the piston or in the bore. 7. Flow control valve according to one of the preceding claims, characterized in that the throttle device consists of a plurality of axially consecutive constrictions ( 104 , 104 ') of small axial extent in a bore in the piston. 8. Flow control valve according to one of claims 1 to 6, characterized in that the throttle device is located on the circumference of the piston, the piston ( 201 ), which has a significantly smaller diameter than the bore, a plurality of annular ribs ( 219 ) of less axial dimension has, whose diameter differs from that of the bore only by a very small amount, so that a pressure medium flowing along the piston ( 201 ) is throttled.