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Piloted type pressure reducing valve

A pilot-operated pressure reducing valve and pilot valve technology, which is applied in the field of hydraulic valves, can solve the problems of easy damage, noise, and large impact of pilot valves, and achieve the effects of reducing impact, slowing down moving speed, and increasing service life

Active Publication Date: 2013-05-08
GUANGXI LIUGONG MASCH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a pilot pressure reducing valve with simple structure, good stability, low noise and long service life in view of the shortcomings of the existing pilot valve of the pressure reducing valve, which is easily damaged due to large impacts and has high noise during operation.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0025] Such as figure 1 figure 2 As shown, the valve body of the pilot-operated pressure reducing valve includes a valve sleeve 10, a screw plug 11 and a valve cap 15 screwed at both ends of the valve sleeve 10, and a high-pressure oil inlet 17 and a low-pressure oil outlet 2 are arranged on the valve body. A valve cavity is arranged inside the valve body, and a main valve core 4 and a pilot valve are arranged in the valve cavity. The main valve core 4, the pilot valve and the cavity wall of the valve cavity are in sliding fit, and the first cavity 6 is formed between the pilot valve and the main valve core 4. The oil outlet 2 is connected, and the other side of the pilot valve is the second cavity 12 . The pilot valve includes a pilot valve core 7 and a pilot valve seat 8. The center of the pilot valve seat 8 is provided with a pilot valve hole. The pilot valve hole is an axial through hole. The pilot valve core 7 includes a guide part 24 at the head and a cone part 27 at ...

Embodiment 2

[0028] Such as image 3 As shown, the pressure reducing valve in this embodiment is a plug-in pressure reducing valve. There are threads on the valve sleeve 10, and when it is inserted into the valve block 29, it is screwed with the valve block 29. The high-pressure oil inlet on the valve sleeve 17 and the low-pressure oil outlet 2 communicate with the high-pressure oil circuit 30 and the low-pressure oil circuit 33 on the valve block 29 respectively, and the pilot valve oil outlet 9 on the valve sleeve 10 communicates with the tank oil circuit 31 on the valve block 29 . Compared with the first embodiment, the main difference of this implementation lies in the fixing method of the limit post 11. In this embodiment, the valve body includes a fixed cap 32 arranged in the bonnet 15, and the center of the fixed cap 32 is arranged There is a fixed hole for fixing the limit post 11, the limit post 11 is inserted in the fixed hole and fixedly connected with the fixed cap 32, the oute...

Embodiment 3

[0030] Such as Figure 4 As shown, the pressure reducing valve in this embodiment is a plug-in pressure reducing valve. Compared with Embodiment 2, the difference is that the valve body of the pressure reducing valve in this embodiment includes a valve seat 34, a valve sleeve 10, and a valve cap. 15. The valve sleeve 10 is sleeved on one end of the valve seat 34, and the outside of the end of the valve sleeve 10 sleeved on the valve seat is provided with threads for threaded connection with the valve block 29, and the valve cap 15 is screwed on the other end of the valve sleeve 10 , the main valve core 4 is slidingly arranged in the valve seat, the high-pressure oil inlet 17 is arranged on the side of the valve seat 34, the low-pressure oil outlet 2 is arranged on the end face of the valve seat 34, the annular groove 3 of the main valve core is connected with the The middle hole 37 of the main spool is connected, and the hydraulic oil flows out from the high-pressure oil inlet...

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Abstract

The invention discloses a piloted type pressure reducing valve and solves the problem that a pilot valve of an existing piloted type pressure reducing valve is easy to damage due to impact and large in noise. A differential type pilot valve is adopted in the piloted type pressure reducing valve, a first cavity communicated with an oil inlet is arranged on the inner side of the pilot valve, a second cavity communicated with a throttle hole is arranged on the outer side of the pilot valve, a pilot valve spool is arranged in a pilot valve seat, a conical portion of the pilot valve spool is arranged in the first cavity and connected with a buffering spring, a pressure regulating spring is arranged on the second cavity side and connected with the pilot valve seat, and a pilot valve gap, a radial through hole and an oil outlet channel between the pilot valve seat and the pilot valve spool form an opened oil discharging channel of the pilot valve. Via the differential type pilot valve, the inverted pilot valve spool, the buffering spring and the pilot valve seat which is capable of moving axially, and via damping effect of the pilot valve spool and the pilot valve throttle hole, impact force when the pilot valve is closed is reduced, the pilot valve is enabled to be always in stable state, so that the piloted type pressure reducing valve has the advantages of small impact, long service life, stability and low noise.

Description

technical field [0001] The invention relates to a hydraulic valve of a hydraulic system, in particular to a pilot pressure reducing valve in the hydraulic system. technical background [0002] The pressure reducing valve is a commonly used pressure control component in the hydraulic system. It is a pressure regulating valve and is often used to stabilize the working pressure of the oil circuit. Existing pressure reducing valves can be divided into direct-acting pressure reducing valves and pilot-operated pressure reducing valves according to different structures and working principles. Pilot-operated pressure reducing valves are especially widely used. [0003] In the existing pilot-operated pressure reducing valve, the pilot valve seat is fixed, the pilot valve cone (also known as the pilot valve core) is supported on the pilot valve seat through the pressure regulating spring, and the oil inlet of the pilot valve is connected to the main valve of the pressure reducing val...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16K17/22
Inventor 俞传芬李群华林建荣
Owner GUANGXI LIUGONG MASCH CO LTD
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