JPH0220547Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in an in-line type fluid check pressure compensating flow regulating valve.

(Background Art) In order to make the shape compact, space-saving, lightweight, and inexpensive, an in-line type pressure-compensating flow regulating valve with a check has been developed. A device as shown in FIG. 1 is known.
This structure has a pressure compensating element 1 and a flow regulating element 2 built into a check valve 3, and is a pressure compensating flow regulating valve with a check for the purpose of downsizing and reducing pressure loss during free flow. There is.
This device is extremely compact and small, but the processing of the check valve 3 with a step, the pressure compensation element 1 and the flow rate adjustment element 2 built therein, and the degree of circularity and fitting between these elements The problem was that it required a lot of machining.

(Purpose of the invention) The purpose of the invention is to provide a pressure-compensated flow rate regulating valve with a check that does not require a lot of machining and is simple and highly accurate.

(Disclosure of the Invention) Therefore, the present invention includes a pressure compensating element in a hole provided in a housing, a sleeve forming a check valve seat and having a communicating hole with an inlet port, a hollow check valve body, and an inner hole thereof. and a flow rate adjustment element that engages with the radial hole thereof, are sequentially housed in substantially a straight line, and the pressure compensation part of the pressure compensation element and the flow rate adjustment part of the flow rate adjustment element are defined by the inner hole of the hollow check valve body, the sleeve. This is a pressure-compensated flow rate regulating valve with a check, characterized in that the hollow hole and the pressure-compensating part communicate with each other through the hollow hole. With this configuration, the flow rate adjustment part and the check valve are commonly used, and the connection between the pressure compensation part, the flow rate adjustment part, and the check valve is extremely thick and has no pressure loss through a hollow hole, the inside of the sleeve, and the inside hole of the check valve body. Because it communicates with one line, there is extremely little pressure loss.
Moreover, it was simple and lightweight, and because the parts were simple, it was easy to process, did not require many machining operations, and was highly accurate.

(Description of Embodiments) Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 2 is a cross-sectional view showing an embodiment of the present invention, in which the housing consists of a main body housing 15 and a lid housing 17; A stepped hole 30 is drilled in the axial direction. Inside the hole 30 is a pressure compensating element 12 and a sleeve 38 forming a check valve seat 40 and having a communicating hole 41 with the inlet port 23.
and a hollow check valve body 35 and its inner hole 3.
9 and the flow regulating element 11 that engages with its radial hole 20 are housed one after another substantially in a straight line. Furthermore, the pressure compensating section 19 and the flow rate adjusting section 24 are connected to the hollow hole 31 of the pressure compensating element 12 and the sleeve 3, respectively.
The hollow hole 32 of the check valve body 35 communicates with the check valve body 35 through the inner hole 39 thereof. The pressure compensating element 12 includes a piston 13 slidably fitted in the hole 30 and having a blind hollow hole 31, a spring 16, a back pressure chamber 1
8, includes a pilot line 33 leading from the inlet port 23 to the back pressure chamber 18, and a pressure compensator 19 consisting of the port hole edge 21 of the outlet port 22 and a small hole 25 overlapping with the port hole edge 21. Small hole 25
allows the outer peripheral surface of the piston 13 facing the outlet port 22 and the hollow hole 31 to communicate with each other. The other flow rate adjusting element 11 is fitted into the hole 30 and fixed, and is pressed by a check spring 36 to the check valve seat 40 of the sleeve 38 having the hollow hole 32 of the through hole. , the rod member 2 is slidably fitted in the axial direction by a screw 28.
7, and a flow rate adjustment section 24 consisting of the outer peripheral edge 26 of the rod member 27 and the radius hole 20 of the check valve body;
including. The radius hole 20 faces the check valve body 3 through the inlet port 23 and the communication hole 41 of the sleeve 38.
5. The outer peripheral surface and the inner hole 39 are communicated with each other.

In operation, when pressure oil enters from the inlet port 23, it passes through the pilot line 33 and enters the back pressure chamber 18 (1
At the same time as entering the next pressure chamber), the communication hole 41 and the radius hole 20
, that is, the inner hole 3 is narrowed by the flow rate adjustment part 24.
9 and hollow holes 31 and 32, passes through the small hole 25 of the piston 13, that is, is throttled by the pressure adjustment part 19, and flows out to the outlet port 22. These operations are well known, and the piston 13 has a pressure _P1 in the back pressure chamber which is the primary pressure chamber and a secondary pressure chamber 29.
It is clear that the pressure compensation action is performed so that the differential pressure between the pressure P ₂ and the pressure P 2 becomes the differential pressure set by the spring 16.

In the case of reverse flow, the pressure P ₂ in the secondary pressure chamber 29 is higher than the pressure P ₁ in the primary pressure chamber, ie, the back pressure chamber 18, so that the piston 13 does not perform a pressure compensation effect. When the pressure exceeds the pressure set by the check spring 36, the check valve body 35 moves to the right and the check valve seat 40 opens, opening the outlet port 22, the small hole 25, the hollow holes 31, 32, the secondary pressure chamber 29, and the communication hole. A free stream exits from 41 to inlet port 23 .

From the above, it will be clear that the embodiment achieves the effects of the above invention.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a conventional product, and FIG. 2 is a cross-sectional view of an embodiment of the present invention. 11...Flow rate adjustment element, 12...Pressure compensation element, 15, 17...Housing, 18...Back pressure chamber, 19...Pressure compensator, 20...Radius hole, 23
...Inlet port, 24...Flow rate adjustment section, 30...
Hole, 35...Check valve body, 38...Sleeve,
39...Inner hole, 40...Check valve seat, 41...
...Communication hole.

Claims (1)

[Scope of utility model registration request] a pressure compensating element in a hole provided in the housing, a sleeve forming a check valve seat and having a communicating hole with the inlet port, and a flow regulating element engaging the hollow check valve body and its inner hole and its radial hole. The pressure compensating section of the pressure compensating element and the flow regulating section of the flow rate regulating element are arranged in a manner that the inner hole of the hollow check valve body, the hollow hole of the sleeve, and the hollow hole of the pressure compensating section are accommodated in sequence approximately in a straight line. A pressure-compensated flow rate regulating valve with a check, characterized in that the valve communicates through the valve.