A micro-motion test device for pneumatic emergency shut-off valve

Abstract

The present invention relates to a micro-motion test device for a pneumatic emergency shut-off valve, which belongs to the technical field of chemical equipment and includes: a three-way valve, a ball valve and a flow-limiting orifice plate. The air outlet and air inlet of the three-way valve and the ball valve are connected in series in sequence through an air pipeline, wherein the air inlet of the three-way valve is connected to the air outlet of the solenoid valve; a flow-limiting hole is provided on the flow-limiting orifice plate, and the flow-limiting hole is connected to the air outlet of the ball valve. The present invention first closes the pressure reducing valve and the solenoid valve, opens the ball valve, and slowly allows the gas in the actuator to flow out from the flow-limiting hole of the flow-limiting orifice plate, and then observes whether the pneumatic actuator refuses to move; the above structure is simple, low in cost, and has low operation and maintenance costs. In addition, the flow-limiting hole venting method is used to replace the existing micro-motion detection method of valve position positioning feedback, which can detect the operating quality of the pneumatic emergency shut-off valve online, reduce the cost of micro-motion detection, and improve the convenience of micro-motion detection.

Description

Technical Field

[0001] The present invention relates to the technical field of chemical equipment, in particular to a micro-motion testing device for a pneumatic emergency shut-off valve. Background Art

[0002] Chemical production pipelines are numerous. To improve safety and stability, pneumatic emergency shut-off valves are often installed on multiple pipelines to prevent leaks or abnormal filling incidents from escalating, protecting human health and production safety. However, pneumatic emergency shut-off valves are prone to misoperation (when the valve is supposed to be in the open position, it suddenly loses control and operates on its own. Misoperation can cause equipment fluctuations or even shutdowns) or refusal to operate (when the valve is in the open position and the valve is not closed), resulting in economic losses or serious casualties.

[0003] At present, manufacturers in the valve field have launched micro-motion test pneumatic regulators to test the operating quality of pneumatic emergency shut-off valves. The micro-motion test pneumatic regulator mainly includes a quantitative instrument air source supply device and a positioner with valve position feedback. After the pneumatic emergency shut-off valve is removed from the chemical production system, the instrument air source supply device is used to supply a quantitative instrument air source, and then the positioner is used to detect the actual valve position change of the pneumatic emergency shut-off valve. Finally, by comparing the actual valve position change with the theoretical valve position change, it is determined whether the operating quality of the pneumatic emergency shut-off valve is qualified.

[0004] The above-mentioned micro-motion test pneumatic regulator can detect the movement quality of the pneumatic emergency shut-off valve, but the cost of manufacture and maintenance is high, which is not conducive to popularization and application. Moreover, the micro-motion test pneumatic regulator does not support online detection and can only detect the disassembled pneumatic emergency shut-off valve during shutdown, which cannot meet the needs of actual chemical production.

[0005] Therefore, how to design a micro-motion testing device for a pneumatic emergency shut-off valve that is low in cost, has low operation and maintenance costs, and can support online detection is an urgent problem that needs to be solved by those skilled in the art. Summary of the Invention

[0006] The present invention provides a micro-motion testing device for a pneumatic emergency shut-off valve, which solves the technical bottleneck of being unable to implement online micro-motion testing of the emergency shut-off valve when a micro-motion testing pneumatic regulator is not installed. Compared with the existing micro-motion testing devices for pneumatic emergency shut-off valves, which have the problems of high construction cost, high operation and maintenance cost, and more complex and cumbersome air path structure, the present invention can better meet the needs of actual chemical production.

[0007] The present invention solves the above-mentioned technical problems with the following technical solutions: a micro-motion test device for a pneumatic emergency shut-off valve, wherein the pneumatic emergency shut-off valve comprises a pressure reducing valve, a solenoid valve, and a pneumatic actuator, wherein the air inlets and air outlets of the pressure reducing valve, the solenoid valve, and the pneumatic actuator are sequentially connected in series via an air pipe, wherein the air inlet of the pressure reducing valve is connected to an instrument air source in a chemical production system via the air pipe; and the device comprises: a three-way valve, a ball valve, and a flow limiting orifice plate.

[0008] The air outlet and air inlet of the three-way valve and the ball valve are connected in series in sequence through an air pipeline, wherein the air inlet of the three-way valve is connected to the air outlet of the solenoid valve; a limiting flow hole is provided on the flow limiting orifice plate and the limiting flow hole is connected to the air outlet of the ball valve.

[0009] The beneficial effects of the present invention are: closing the air inlet of the pressure reducing valve, opening the air outlet of the solenoid valve, opening the ball valve, and the instrument air in the actuator slowly flows out from the flow limiting hole of the flow limiting orifice plate. At this time, observe whether the pneumatic actuator refuses to move (the pressure of the instrument air source inside the pneumatic actuator gradually decreases, and the executing end of the pneumatic actuator should move according to the design principle, but the executing end of the pneumatic actuator does not move, and the pneumatic emergency shut-off valve is still opened normally); the above structure is simple, low in cost, and low in operation and maintenance cost, and the flow limiting hole venting method is used to replace the existing micro-motion detection method of valve position positioning feedback, which can detect the operating quality of the pneumatic emergency shut-off valve online, reduce the cost of micro-motion detection, and improve the convenience of micro-motion detection.

[0010] On the basis of the above technical solution, the present invention can also be improved as follows.

[0011] Furthermore, it also includes a pressure gauge, the first air outlet of the three-way valve is connected to the ball valve; the pressure gauge is connected to the second air outlet of the three-way valve.

[0012] The further beneficial effect of adopting the above method is: by using a pressure gauge to detect the air flow pressure between the ball valve and the solenoid valve in real time, the execution status of the pneumatic actuator execution end under different air pressures can be determined, and then compared with the theoretical air pressure execution status, the operating quality of the pneumatic actuator can be judged more accurately.

[0013] Furthermore, the ball valve is a manual ball valve.

[0014] Furthermore, the diameter of the flow limiting hole is 0.5 mm-1.0 mm. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a structural schematic diagram of a micro-motion test device for a pneumatic emergency shut-off valve of the present invention installed on the pneumatic emergency shut-off valve;

[0016] Figure 2 for Figure 1 A local enlarged schematic diagram of AA.

[0017] Figure 3 The figure is a schematic diagram of the internal structure of a flow limiting orifice plate in a micro-motion test device for a pneumatic emergency shut-off valve according to the present invention.

[0018] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0019] 1. Pressure reducing valve, 2. Solenoid valve, 3. Pneumatic actuator, 4. Three-way valve, 5. Ball valve, 6. Flow limiting orifice, 61. Flow limiting hole, 7. Pressure gauge. DETAILED DESCRIPTION

[0020] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0021] like Figure 1 As shown, a micro-motion test device for a pneumatic emergency shut-off valve is shown. The pneumatic emergency shut-off valve includes a pressure reducing valve 1, a solenoid valve 2, and a pneumatic actuator 3. The air inlets and outlets of the pressure reducing valve 1, the solenoid valve 2, and the pneumatic actuator 3 are connected in series via an air pipe. The air inlet of the pressure reducing valve 1 is connected to an instrument air source in a chemical production system via the air pipe. The device also includes a three-way valve 4, a ball valve 5, and a flow limiting orifice 6.

[0022] The air outlet and air inlet of the three-way valve 4 and the ball valve 5 are connected in series in sequence through the air pipeline, wherein the air inlet of the three-way valve 4 is connected to the air outlet of the solenoid valve 2; a limiting flow hole 61 is provided on the flow limiting orifice 6 and the flow limiting hole 61 is connected to the air outlet of the ball valve 5.

[0023] In some specific embodiments, a pressure gauge 7 may also be included, the air inlet of the three-way valve 4 is connected to the air outlet of the solenoid valve 2 and its first air outlet is connected to the ball valve 5; the pressure gauge 7 is connected to the second air outlet of the three-way valve 4.

[0024] In some specific embodiments, the ball valve 5 may be a manual ball valve.

[0025] In some specific embodiments, the diameter of the flow restriction hole 61 may be 0.5 mm-1.0 mm.

[0026] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A micro-motion test device for a pneumatic emergency shut-off valve, the pneumatic emergency shut-off valve comprising a pressure reducing valve (1), a solenoid valve (2) and a pneumatic actuator (3), wherein the air inlets and air outlets of the pressure reducing valve (1), the solenoid valve (2) and the pneumatic actuator (3) are sequentially connected in series via an air pipe, wherein: The air inlet of the pressure reducing valve (1) is connected to the instrument air source in the chemical production system through an air pipe; it is characterized by comprising: a three-way valve (4), a ball valve (5) and a flow limiting orifice (6), The air outlets and air inlets of the three-way valve (4) and the ball valve (5) are connected in series in sequence through an air pipeline, wherein the air inlet of the three-way valve (4) is connected to the air outlet of the solenoid valve (2); a limiting flow hole (61) is provided on the flow limiting orifice (6), and the flow limiting hole (61) is connected to the air outlet of the ball valve (5).

2. A micro-motion test device for a pneumatic emergency shut-off valve according to claim 1, characterized in that: It also includes a pressure gauge (7), the first air outlet of the three-way valve (4) is connected to the ball valve (5); the pressure gauge (7) is connected to the second air outlet of the three-way valve (4).

3. A micro-motion test device for a pneumatic emergency shut-off valve according to claim 1, characterized in that: The ball valve (5) is a manual ball valve.

4. A micro-motion test device for a pneumatic emergency shut-off valve according to claim 1, characterized in that: The diameter of the flow limiting hole (61) is 0.5 mm to 1.0 mm.

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