CN110779711A

CN110779711A - Method for checking on-off of hydraulic and pneumatic valves

Info

Publication number: CN110779711A
Application number: CN201810838812.1A
Authority: CN
Inventors: 刘建
Original assignee: Chengdu Aircraft Industrial Group Co Ltd
Current assignee: Chengdu Aircraft Industrial Group Co Ltd
Priority date: 2018-07-27
Filing date: 2018-07-27
Publication date: 2020-02-11

Abstract

The invention discloses a method for checking the on-off of a valve path, wherein a plug is used for blocking the inlet of the valve path, a guide pipe is inserted through the plug, smoke is blown in through the guide pipe, the smoke moves along the inner pipeline of a valve body, and if the valve path is closed, no smoke is emitted from the outlet of the valve path; if the valve path is through, smoke emerges from the outlet of the valve path. When the valve core is closed, smoke is blown in through the guide pipe, and if smoke emerges from the outlet of the valve path, the valve seal is judged to be damaged. The smoke diffuses quickly under pressure, fills the pipe space in a short time, and overflows the outlet along the passage space. The invention overcomes the problems of secondary pollution to the valve and damage to the sealing element; the hydraulic test bed is not needed, equipment data does not need to be searched, the device is particularly suitable for a working site, the inspection speed is high, the efficiency is high, and the operation is simple and convenient.

Description

Method for checking on-off of hydraulic and pneumatic valves

Technical Field

The invention relates to a hydraulic and pneumatic valve, in particular to a method for checking the on-off condition of the valve.

Background

On the existing mechanical equipment, hydraulic and pneumatic valves are often marked unclear due to the effect of oil stains, and the closing state of the valves is difficult to judge. Especially in the absence of component sample data and test beds. Conventionally, a valve is disassembled and judged according to the disassembled parts. This method can cause secondary contamination of the valve and damage to the seal.

Disclosure of Invention

The present invention is directed to solving the above-mentioned problems and to providing a new and simple method for checking hydraulic and pneumatic valves.

The technical scheme of the invention is as follows:

a method for checking the on-off of hydraulic and pneumatic valves comprises blocking the inlet of a valve path with a plug, inserting a conduit through the plug, blowing smoke through the conduit, allowing the smoke to move along the valve path in a valve body, and allowing the outlet of the valve path to emit no smoke if the valve path is closed; if the valve path is through, smoke emerges from the outlet of the valve path.

Further, for a valve island comprising a plurality of inlets and outlets, blocking a valve port by using a blocking object, inserting a guide pipe through the blocking object, blowing smoke in through the guide pipe, enabling the smoke to move along a pipeline in the valve body, and judging that the valve port and the valve channel are communicated if the valve port with the smoke is emitted; and judging that the valve port valve path is closed when the valve port without the smoke emerges.

Further, smoke is blown in through the guide pipe when the valve core is closed, and if smoke is emitted from a valve port of the valve path, the valve seal is judged to be damaged.

The smoke is colored smoke.

The smoke diffuses quickly under pressure, fills the pipe space in a short time, and overflows the outlet along the passage space. And (3) blowing the smoke into the pipeline of the valve body, and observing whether the smoke is emitted from other pipe orifices of the valve body, so that the on-off conditions of the hydraulic valve and the pneumatic valve can be checked and judged.

The invention overcomes the problems of secondary pollution to the valve and damage to the sealing element. The device does not need a hydraulic test bed, does not need to search equipment data, is particularly suitable for a working site, and has the advantages of high inspection speed, high efficiency and simple and convenient operation.

Drawings

FIG. 1 schematic view of hydraulic and pneumatic valves determined by colored smoke inspection

FIG. 2 is a schematic view showing the valve core after being actuated by colored smoke

FIG. 3 is a schematic view showing the inspection of colored smoke to determine the sealing condition of the valve core

FIG. 4 is a schematic view of the check and judgment of the trend of invisible oil paths in a valve terminal by using colored smoke

In the figure: the hydraulic control valve comprises a valve body 1, a sealing ring 2, a valve core 3, an oil port 4B, an oil port 5P, smoke 6, a plug 7, an oil port 8A, an oil return port 9, a thin tube 10, a left oil port 12, a plug 13, an oil feeding port 14, a first right oil port 15, a second right oil port 16 and a third right oil port 17.

Detailed Description

The invention is further illustrated with reference to the following figures and examples.

Example 1

Referring to fig. 1, an operator inserts a thin tube into a P port 5 of a valve body 1, blocks the P port 5 with cotton yarn or other plugs 7, and blows cigarette smoke 6, which is blue, into an oil inlet hole from one end of the thin tube 10 while ensuring safety. And smoke moves along the pipeline in the valve body, and if the valve core is in a closed position, the oil port B4, the oil port A8 and the oil return port 9 do not emit blue smoke.

Referring to fig. 2, when smoke 6 is blown in when the valve core 3 is in the open position, blue smoke emerges from the oil port a 8.

Referring to fig. 3, when smoke 6 is blown in when the valve core 3 is in the closed position, blue smoke emerges from the oil port a 8. It can be concluded that the valve seal has been broken.

Example 2

See fig. 4, check the valve island oil circuit in this way. The valve island is internally provided with a plurality of oil paths in all directions, but the oil paths cannot be observed visually. Smoke 6 is blown in from the third right oil port 17, and blue smoke emerges from the left oil port 12 and the upper oil port 14 which are communicated with the oil circuit. The first right side oil port 15 and the second right side oil port 16 are not communicated with the third right side oil port 17, so that no smoke is emitted. Under the condition of no drawing data, the trend of each oil way can be found out by adopting a colored smoke inspection method, and the method is simple and reliable.

Other readily available safe colored sprays can also be used for the smoke.

Claims

1. A method for checking the on-off of a hydraulic valve and a pneumatic valve is characterized in that a plug is used for blocking the inlet of a valve path, a guide pipe is inserted through the plug, smoke is blown in through the guide pipe, the smoke moves along the valve path in the valve body, and if the valve path is closed, no smoke is emitted from the outlet of the valve path; if the valve path is through, smoke emerges from the outlet of the valve path.

2. The method of claim 1, wherein a valve port of the valve island having a plurality of ports is blocked by a plug, a pipe is inserted through the plug, smoke is blown in through the pipe, the smoke moves along a pipeline in the valve body, and if the valve port has smoke, the valve port is judged to be through; and judging that the valve port valve path is closed when the valve port without the smoke emerges.

3. A method of checking the make and break of hydraulic and pneumatic valves as claimed in claim 1 or 2, characterised in that smoke is blown through the conduit while the spool is closed, and if smoke is blown out of the valve port of the valve circuit, it is determined that the valve seal has been damaged.

4. A method of checking the make and break of hydraulic and pneumatic valves as claimed in claim 1 or 2, characterized in that said fumes are coloured fumes.