What is a stainless steel diaphragm valve?

2024-05-30

Stainless steel diaphragm valve is a special form of stainless steel cut-off valve. Its opening and closing parts are a diaphragm made of soft material, which separates the inner cavity of the valve body from the inner cavity of the valve cover and the driving parts to achieve the effect of closing the flow channel and cutting off the fluid. It is now widely used in various fields.

Advantages

Simple structure

The stainless steel diaphragm valve has only three main components: stainless steel valve body, diaphragm and stainless steel valve cover. The diaphragm separates the inner cavity of the lower valve body from the inner cavity of the upper valve cover, so that the valve stem, valve stem nut, valve disc, pneumatic control mechanism, electric control mechanism and other parts located above the diaphragm do not contact the medium, and there will be no leakage of the medium, eliminating the sealing structure of the stuffing box.

Low maintenance cost

The diaphragm of the stainless steel diaphragm valve is replaceable and has low maintenance costs.

Strong applicability

The diversified lining materials of the stainless steel diaphragm valve can be applied to various media according to actual conditions, and have the characteristics of high strength and good corrosion resistance.

Low pressure loss

The straight-through streamlined flow channel design of the stainless steel diaphragm valve can greatly reduce the loss pressure.

Disadvantages

Due to the limitations of the valve body lining process and diaphragm manufacturing process, stainless steel diaphragm valves are not suitable for larger pipe diameters and are generally used in pipelines ≤ DN200.
Due to the limitations of diaphragm materials, stainless steel diaphragm valves are suitable for low pressure and low temperature occasions. Generally, do not exceed 180℃.

1. The center positions of the two ends are different

The center points of the two ends of the stainless steel eccentric reducer are not on the same axis.

The center points of the two ends of the stainless steel concentric reducer are on the same axis.

2. Different operating environments

One side of the stainless steel eccentric reducer is flat. This design facilitates exhaust or liquid drainage and facilitates maintenance. Therefore, it is generally used for horizontal liquid pipelines.

The center of the stainless steel concentric reducer is on a line, which is conducive to fluid flow and has less interference with the flow pattern of the fluid during diameter reduction. Therefore, it is generally used for diameter reduction of gas or vertical liquid pipelines.

3. Different installation methods

Stainless steel eccentric reducers are characterized by simple structure, easy manufacturing and use, and can meet a variety of pipeline connection needs. Its application scenarios mainly include:

Horizontal pipe connection: Since the center points of the two ends of the stainless steel eccentric reducer are not on the same horizontal line, it is suitable for the connection of horizontal pipes, especially when the pipe diameter needs to be changed.

Pump inlet and regulating valve installation: The top flat installation and bottom flat installation of the stainless steel eccentric reducer are suitable for the installation of the pump inlet and regulating valve respectively, which is beneficial to exhaust and discharge.

Stainless steel concentric reducers are characterized by less interference to fluid flow and are suitable for reducing the diameter of gas or vertical liquid pipelines. Its application scenarios mainly include:

Gas or vertical liquid pipeline connection: Since the center of the two ends of the stainless steel concentric reducer is on the same axis, it is suitable for the connection of gas or vertical liquid pipelines, especially where diameter reduction is required.

Ensure the stability of fluid flow: The stainless steel concentric reducer has little interference with the fluid flow pattern during the diameter reduction process and can ensure the stability of the fluid flow.

4. Selection of eccentric reducers and concentric reducers in practical applications

In actual applications, appropriate reducers should be selected according to the specific conditions and needs of pipeline connections. If you need to connect horizontal pipes and change the pipe diameter, choose stainless steel eccentric reducers; if you need to connect gas or vertical liquid pipes and change the diameter, choose stainless steel concentric reducers.