The valve stem of the diaphragm valve is sealed by a soft and pressure-bearing diaphragm that connects the valve stem to the closing member. As long as the diaphragm does not fail, this seal can prevent any medium from leaking to the atmosphere through the valve stem. The shape of the diaphragm can be a round cap shape or a bellows shape. The material structure of the diaphragm. Depending on the application, it can be made of rubber elastomer and plastic.

The structure and form of the diaphragm valve are not the same as the traditional valve. It is a cut-off valve in a special form. This cut-off valve is a special and new type of valve. People may know a lot about traditional valves, but they don’t know much about the new generation of diaphragm valves. For example, where is the diaphragm valve generally used, and what does it do? Next, explain and analyze where the diaphragm valve is generally used.

The structure of the diaphragm valve is very different from the general valve. It is a new type of valve and a special form of cut-off valve. Its opening and closing part is a diaphragm made of soft material. The inner cavity of the bonnet and the driving part are separated and are now widely used in various fields. Commonly used diaphragm valves include rubber-lined diaphragm valves, fluorine-lined diaphragm valves, unlined diaphragm valves, and plastic diaphragm valves.

1. This valve is composed of valve body, bonnet, valve stem, valve disc, diaphragm and driving parts.

2. The opening and closing of the valve is achieved by rotating the hand wheel. When the handwheel is rotated clockwise, the valve will drop to cut off the passage; otherwise, the valve will open.

3. When the diaphragm valve is used in the water vapor pipeline with the working temperature ≤120℃, the material of the diaphragm should be heat-resistant rubber, and indicate it when ordering.

The structure of the diaphragm valve is very different from the general valve. It relies on a soft rubber film or plastic film to control the fluid movement. Common diaphragm valve materials are divided into ductile iron，cast irons, cast steel , stainless steel, and plastic .

The structure of the diaphragm valve is quite different from the general valve. It is a new type of valve and a special form of cut-off valve. Its opening and closing part is a diaphragm made of soft material. The inner cavity of the cover and the driving part are separated and are now widely used in various fields. Commonly used diaphragm valves include rubber-lined diaphragm valves, fluorine-lined diaphragm valves, unlined diaphragm valves, and plastic diaphragm valves.

Diaphragm valve is composed of valve body, valve bonnet, valve disc, valve stem, diaphragm and other driving parts. It is a special form of shut-off valve. Its opening and closing parts are composed of a diaphragm made of a soft material inlaid with a metal valve clack, which separates the inner cavity of the valve body from the inner cavity of the valve bonnet and the driving parts. The most prominent feature of the diaphragm valve is that the diaphragm separates the inner cavity of the lower valve body from the inner cavity of the upper bonnet, so that the valve stem, valve clack and other parts located above the diaphragm are not corroded by the medium, which can ensure the purity of the medium and will not make the medium. leak.

Under normal circumstances, if it is not tightly closed, first check to see if the valve is closed in place. If it has been closed in place, there is still leakage and cannot be sealed, then check the sealing surface. If the vice-sealing pair can be disassembled, then take it out for grinding and test again. Of course, if it is still not closed tightly, then it must be returned to the factory for repair or replacement of the valve, so as not to affect the normal use of the valve and accidents such as working conditions.

Today, we talk about 2 Types industrial valve sealing type

The seal is also a very critical component in the valve. The sealing performance of the valve refers to the ability of each sealing part of the valve to prevent the leakage of the medium. It is the most important technical performance index of the valve.

There are many factors that affect valve sealing, We can find there are 4 main elements.

mainly as follows:

1. Sealing structure

Under the change of temperature or sealing force, the structure of the vice-sealing part will change. Moreover, this change will affect and change the force between the vice-sealing part, thereby reducing the performance of the valve sealing.