Introduction to diaphragm valves
Diaphragm valves are a common control valve widely used in industrial liquid, gas and powder piping systems. The unique design of diaphragm valve makes it have many advantages and application characteristics. Here are some general knowledge about diaphragm valves:
Structure features: Diaphragm valve is composed of valve body, valve cover, diaphragm and operating mechanism. The valve body is usually made of cast iron, stainless steel, or plastic, and the valve cap is usually made of cast iron, steel, or plastic. The diaphragm in the middle is made of elastic materials, common materials are rubber, polytetrafluoroethylene and nitrile rubber. The operating mechanism is usually manual, pneumatic or electric.
How it works: Diaphragm valves control the flow of fluid through the diaphragm. When the valve is closed, a seal is formed between the diaphragm and the valve body and cap, preventing fluid from passing through. When the valve is opened, the force provided by the operating mechanism causes the rod rod on the valve cover to move, causing the diaphragm to rise from the valve body and the fluid to begin flowing. By adjusting the force provided by the operating mechanism, the opening of the valve can be controlled, thus controlling the flow of the fluid.
Single Diaphragm Valve: This diaphragm valve has only one diaphragm and opens and closes the valve by compression or tension. Single-diaphragm valves are relatively simple and compact in structure. It is suitable for the control of low pressure, medium and mild general fluids, and has good sealing performance and service life.
Double Diaphragm Valve (Double Diaphragm Valve) : This diaphragm valve has two diaphragms and is usually mounted with one diaphragm and one diaphragm. The opening and closing of the valve is controlled by the difference of air or liquid pressure between the two diaphragms. Dual diaphragm valves for better sealing performance and operating accuracy. It is often used for tighter control of fluids, such as high purity fluids, corrosive media or high viscosity media.
Separate Diaphragm Valve (Weir Diaphragm Valve) : The diaphragm structure of this diaphragm valve is separated into two separate chambers. There is an intermediate chamber between the upper and lower diaphragm, and the pressure of the intermediate chamber controls the motion of the diaphragm. Separate diaphragm valves usually have good sealing performance, blockage resistance and easy maintenance.
Advantages and applications: Diaphragm valves have many advantages, such as reliable sealing performance, corrosion resistance, wear resistance, no leakage, no leakage and easy maintenance. This makes them particularly suitable for special working conditions such as corrosive media, high viscosity liquids, suspended particles and flammable and explosive media. Diaphragm valves are widely used in chemical, petroleum, electric power, metallurgy, pharmaceutical, food and beverage industries.
