Piston type bidirectional solenoid valve

NegotiableUpdate on 03/06

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Nature of the Manufacturer: Producers

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Overview

Piston type bidirectional solenoid valve, suitable for non corrosive refrigerant (liquid or gas) refrigeration units, and can also be used for automatic control of pneumatic systems.

Product Details

　　Introduction to piston type bidirectional solenoid valve:

Suitable for non corrosive refrigerant (liquid or gas) refrigeration units, and can also be used for automatic control of pneumatic systems.

Principle:

Mainly composed of a pilot valve and a main valve, the main valve adopts a rubber sealing structure. When in the constant position, the movable iron core seals the pilot valve port, the pressure inside the valve chamber is balanced, and the main valve port is closed. When the coil is energized, electromagnetic force is generated to attract the movable iron core, causing the medium in the main valve chamber to leak out from the pilot valve port, resulting in a pressure difference. The diaphragm or valve cup is quickly lifted, and the main valve port opens, opening the valve. When the coil is powered off, the magnetic field disappears, the movable iron core resets, the pilot valve port is closed, and after the pressure inside the pilot valve and main valve chamber is balanced, the valve is closed again.

When the coil is powered on, the electromagnetic force opens the pilot hole, causing the pressure in the upper chamber to rapidly decrease, creating a high and low pressure difference around the diaphragm, pushing it upwards and opening the valve; When the power is cut off, the spring force closes the pilot hole, and the inlet pressure quickly enters the upper chamber through the bypass hole, forming a pressure difference of lower and higher around the diaphragm, pushing the diaphragm downwards and closing the valve

　　Structural features:

1. Widely used and diverse in models.

2. Small power, fast action, and lightweight appearance.

3. The applicable medium is limited and the adjustment accuracy is limited.

4. Easy to control internal leakage, completely block external leakage, and ensure safe use.

5. Easy to connect to computer, simple system, and low price.

　　Installation steps for piston type bidirectional solenoid valve:

1. When receiving the goods, it is necessary to check whether the model and parameters on the solenoid valve label or tag are consistent with the model and parameters proposed when ordering. If there are any errors, please contact the supplier immediately.

2. Before installation, you should carefully read the user manual and check whether the actual operating parameters on site are within the range of the product you purchased. If the on-site operating parameters exceed the allowable range, please stop installation or use immediately and consult with us to avoid accidents or damage to the product.

3. Strictly follow the installation steps, remember the precautions and key points, and make sufficient preparations before installation.

4. Before installing and connecting the solenoid valve to the pipeline, flush the pipeline with air or water with a pressure of ≥ 0.3MPa to ensure that impurities (such as welding slag, sealing debris, dirt, etc.) in the pipeline are removed before connecting the solenoid valve.

5. Electromagnetic valves should not be installed in low-lying areas of pipelines. If installed in the discharge pipeline section of a container, the outlet of the pipeline should not be led out from the bottom of the container as much as possible to prevent impurities from entering the electromagnetic valve and causing malfunctions. Therefore, the outlet of the pipeline should be led out from a slightly higher position at the bottom of the container.

6. Electromagnetic valves can generally only be used in one direction and cannot be installed in reverse. There is usually a "→" symbol on the valve body to indicate the flow direction of the medium, or the English letters "IN" to indicate the inlet and "OUT" to indicate the outlet. Please be sure to install them in the direction indicated, otherwise automatic opening or leakage may occur when the fluid reaches the solenoid valve.

7. When taking over, be careful not to use excessive sealing materials. For example, when connecting with threads, the length of the external thread of the connecting pipe should not exceed the effective length of the internal thread of the solenoid valve. Use a file to chamfer at the half pitch of the front end of the external thread, and start wrapping the sealing tape from the second tooth of the thread. Otherwise, excessive sealing tape or adhesive residue entering the inner cavity of the solenoid valve may cause malfunction.

8. The requirements of solenoid valves for fluids: The fluid should be free of impurities, crystallization, solidification, scaling, paste, and viscosity<22CST, otherwise it may cause faults. At the same time, a filter should be installed on the front pipeline of the solenoid valve, and the mesh size of the filter should be ≥ 60 to prevent impurities from entering the solenoid valve.

9. Pay attention to the protection level of the product you have ordered. The regular model should not be used in flammable and explosive hazardous environments, and the IP54 level should not be installed in outdoor, severely leaking, or splashing areas.

10. The solenoid valve should be installed in a horizontal pipeline. The coil should be installed vertically upwards and should not be installed vertically, otherwise it may cause leakage and affect the service life.

11. The installation position of the solenoid valve should reserve a certain operating space for daily and regular maintenance.

12. In the case of insufficient pipeline rigidity or water hammer phenomenon, it is recommended to fix the pipes before and after the valve with brackets or other methods to prevent vibration caused by the operation of the solenoid valve.

13. When used in frozen or extremely cold places, insulation materials should be used to insulate the pipes and valve bodies, or heaters should be installed on the pipes.

14. After connecting the solenoid valve to the pipeline, forward pressure should be applied (do not apply reverse pressure, otherwise it will damage the solenoid valve), and the solenoid valve and connecting pipe should be checked for leaks.

15. For solenoid valves equipped with standard junction boxes, the plastic junction box should be removed and opened. After removing the factory test power cord, the user power cord should be connected to the terminal and fixed. However, for wire or lead type solenoid valves, it cannot be removed and the wire should be directly connected to the user power cord.

16. The power control circuits and facilities related to solenoid valves, such as relays, switches, and contactors, should be firmly connected without looseness or vibration. The electrical circuit should be connected to corresponding safety wires as protection for the electrical circuit, otherwise it will affect the normal operation or damage of the solenoid valve.

17. To facilitate normal maintenance or prevent maintenance and replacement of solenoid valves in case of malfunction, and to ensure the normal operation of the system, it is recommended to adopt one of the following backup pipeline schemes:

18. After the installation of the solenoid valve and the completion of the preliminary preparation and testing process, it must be tested with fluid 3-5 times to confirm that it is normal before it can be put into formal use.

19. Attention: If you inform us when ordering the solenoid valve that it is liquid filled, but during testing it is gas filled, if there is a leakage or leakage exceeding the standard, it is a normal phenomenon because there is a difference in density and viscosity between gas and liquid. At this time, if you fill the liquid, there will be no leakage or leakage exceeding the standard.