Pneumatic diaphragm valve, also known as diaphragm stop valve, refers to a compression device that is equipped with a flexible membrane or combination diaphragm inside the valve body and valve cover, and its closing part is connected to the diaphragm. The valve seat can be in the shape of a weir or a straight wall through the flow channel. The flexible membrane or combination diaphragm of a diaphragm valve is surrounded by a control chamber, which generates pressure by injecting compressed air, natural gas, water, or other substances into the control chamber. The flexible membrane or combination diaphragm is compressed and bent, causing the cross-sectional area of the diaphragm to change or even close, thereby achieving the purpose of controlling flow and feeding. When the control pressure is about 2.5 bar higher than the pressure of the conveying liquid, the diaphragm valve can seal gas, liquid, paste and powder liquid. The highly elastic diaphragm can transport any material, especially suitable for conveying powdered materials.

Working principle of pneumatic diaphragm valve

Working principle of pneumatic diaphragm valve

Pneumatic diaphragm valve is composed of three parts: valve body, diaphragm, and valve cover, with a very simple structure. And its operation can only be achieved by compressing air to control and adjust the working state and operating speed of the valve. Throughout the operation, the material only comes into contact with the diaphragm inside the valve body, and contact with other components is effectively separated by the diaphragm. Therefore, using diaphragm valves to transport sensitive materials can have a good effect.

The advantages of pneumatic diaphragm valves are even more significant for transporting bulk materials, especially those that are not easy to flow. Due to the common problems of poor flowability, easy blockage of pipelines, and significant friction on pipelines during the transportation of viscous and paste materials in bulk, it is particularly important to choose the valve body to control when transporting such materials. Although ordinary butterfly valves and ball valves are also commonly used for conveying bulk materials, production may come to a halt when the material flow is poor, causing wall hanging or blockage, which cannot be effectively closed.

The use of diaphragm valves can basically prevent the occurrence of the above phenomena, greatly reducing the negative impact caused by production uncertainty, and thus effectively controlling and operating the entire system.