Diaphragm valve manufacturer

Zhejiang sanitary diaphragm valve manufacturerProduct Introduction

The structural form of the clean diaphragm valve is very different from that of general valves. It is a new type of valve and a special form of shut-off valve. Its opening and closing member is a diaphragm made of soft material, which separates the valve body cavity from the valve cover cavity and driving components. It is now widely used in various fields. The commonly used diaphragm valves include rubber lined diaphragm valves, fluorine lined diaphragm valves, unlined diaphragm valves, and plastic diaphragm valves. Diaphragm valve is a type of compression device with a flexible diaphragm or combination diaphragm installed inside the valve body and valve cover, and its closing component is connected to the diaphragm. The valve seat can be in the shape of a weir or a straight through pipe wall. The advantage of diaphragm valve is that its operating mechanism is separated from the medium passage, which not only ensures the purity of the working medium, but also prevents the possibility of the medium in the pipeline impacting the working parts of the operating mechanism. In addition, there is no need to use any form of separate sealing at the valve stem unless it is used as a safety facility in controlling hazardous media. In diaphragm valves, as the working medium only comes into contact with the diaphragm and valve body, which can be made of various materials, this valve can ideally control multiple working media, especially suitable for media with chemical corrosiveness or suspended particles. The working temperature of diaphragm valves is usually limited by the materials used for the diaphragm and valve body lining, and its working temperature range is approximately -50 to 175 ℃. The diaphragm valve has a simple structure, consisting only of three main components: the valve body, diaphragm, and valve head assembly. This valve is easy to disassemble and repair quickly, and replacing the diaphragm can be completed on-site and in a short period of time.

Zhejiang sanitary diaphragm valve manufacturerworking principle

Diaphragm valves use corrosion-resistant lined valve bodies and corrosion-resistant diaphragms instead of valve core components, utilizing the movement of the diaphragm for regulating purposes. The valve body material of the diaphragm valve is made of cast iron, cast steel, or cast stainless steel, and lined with various corrosion-resistant or wear-resistant materials, diaphragm material rubber, and polytetrafluoroethylene. The lining diaphragm has strong corrosion resistance and is suitable for regulating highly corrosive media such as strong acids and alkalis.

Diaphragm valves have a simple structure, low fluid resistance, and greater flow capacity compared to other types of valves of the same specifications; No leakage, can be used for regulating high viscosity and suspended particle media. The diaphragm isolates the medium from the upper chamber of the valve stem, so there is no packing medium and it will not leak out. However, due to the limitations of diaphragm and lining materials, the pressure resistance and temperature resistance are poor, and it is generally only suitable for nominal pressures of 1.6 MPa and below 150 ℃.

The flow characteristics of diaphragm valves are close to fast opening characteristics, approximately linear before 60% stroke, and there is little change in flow after 60%. Pneumatic diaphragm valves can also be equipped with feedback signals, limiters, and locators to meet the needs of self-control, program control, or flow regulation. The feedback signal of the pneumatic diaphragm valve adopts non-contact sensing technology. This product uses a thin film propulsion cylinder instead of a piston cylinder, eliminating the disadvantage of the piston ring being easily damaged, causing leakage and preventing the valve from opening and closing. When the gas source malfunctions, the handwheel can still be operated to open and close the valve.

Product Features

(1) Low fluid resistance.

(2) Can be used for media containing hard suspended solids; Due to the fact that the medium only comes into contact with the valve body and diaphragm, there is no need for a stuffing box, and there is no problem of stuffing box leakage, which may cause corrosion to the valve stem.

(3) Suitable for corrosive, viscous, and slurry media.

(4) Cannot be used in high-pressure situations.

① Before installing the diaphragm valve, carefully check whether the operating conditions of the pipeline are consistent with the specified range of use of this valve, and clean the inner cavity to prevent dirt from blocking or damaging the sealing components.

② Do not apply grease on the rubber lining layer and rubber diaphragm surface to prevent rubber swelling and affect the service life of the diaphragm valve.

③ Handwheels or transmission mechanisms are not allowed for lifting purposes and collisions are strictly prohibited.

④ When manually operating the diaphragm valve, auxiliary levers should not be used to prevent excessive torque from damaging the driving components or sealing parts.

⑤ Diaphragm valves should be stored in a dry and ventilated room, and stacking is strictly prohibited. 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.