The U-shaped diaphragm valve is a special structure valve, with the core component being the diaphragm. It isolates the valve's opening and closing components from the medium, thereby achieving effective control of the fluid. When the valve is in the closed state, the diaphragm tightly adheres to the valve seat under the pressure of the medium or external operating force, preventing the flow of the medium. At this point, the shape of the U-shaped diaphragm forms a good seal with the valve seat, dividing the movement space inside the pipeline into two independent parts, preventing the medium from passing through the valve.

When it is necessary to open the valve, an upward force is applied to the diaphragm through an external operating device (such as a handwheel, pneumatic actuator, or electric actuator), causing the diaphragm to overcome the downward force generated by the medium pressure, leave the valve seat, and form a flow channel. The medium can then pass through the valve under the pressure difference. Due to the diaphragm separating other components of the valve from the medium, the medium will not directly contact the transmission parts and internal structure of the valve body during the opening and closing process, thereby avoiding corrosion and wear of these components by the medium.

In terms of regulating flow, by changing the lifting height of the diaphragm, the flow rate of the medium through the valve can be accurately controlled. When the diaphragm is lifted higher, the flow area increases and the flow rate increases; On the contrary, when the diaphragm is lifted lower, the flow area decreases and the flow rate correspondingly decreases. This flow regulation method is relatively flexible and has high accuracy, which can meet the requirements of flow control under different working conditions.

Precautions for using U-shaped diaphragm valve:

1. Installation aspect

-Preparation before installation: Carefully check whether the operating conditions of the pipeline (such as pressure, temperature, medium type, etc.) are consistent with the specified range of use of the diaphragm valve, clean the valve cavity to prevent dirt from blocking or damaging the sealing components.

-Avoid contact with grease: Do not apply grease on the rubber lining layer and rubber diaphragm surface to prevent rubber swelling, which may affect the sealing performance and service life of the diaphragm valve.

-Correct connection and welding: When connecting valves, pay attention to aligning the pipeline to ensure correct connection; Before welding on the valve body, the actuator must be disassembled.

2. Operational aspects

-Operation method: When manually operating, do not use auxiliary levers to increase torque, and use appropriate force to smoothly open and close the valve; For valves operated by pneumatic or electric means, they should be operated according to the prescribed operating methods.

-Collision prohibited: The handwheel or transmission mechanism of the diaphragm valve is not allowed to be used as a lifting tool. Collision is strictly prohibited to avoid damaging the valve.

3. Maintenance and upkeep aspects

-Regular inspection: Regularly inspect the surface of the valve for signs of rust, cracks, leaks, etc., check whether the sealing surface is smooth and undamaged, manually operate the valve, and check whether its opening and closing are flexible and smooth, without any jamming phenomenon.

-Lubrication and Cleaning: Regularly add an appropriate amount of lubricant to the moving parts of the valve according to its type and usage environment to reduce wear and tear; Simultaneously clean the dirt and impurities attached inside and outside the valve.

-Replacing the diaphragm: Replace the diaphragm according to the correct method. During the replacement process, pay attention to maintaining the open connection between the diaphragm and the sealing surface, and then separate the diaphragm from the sealing surface. Ensure good sealing during installation.

4. Storage: Diaphragm valves should be stored indoors in a dry and ventilated area to avoid damage to the valves from humid environments. It is strictly prohibited to stack diaphragm valves to prevent deformation or damage to the valves. The channels at both ends of inventory diaphragm valves must be sealed, and the opening and closing components should be in a slightly open state.