Diaphragm pressure reducing valve is a common pressure reducing equipment with a wide range of applications. The following is a detailed description of the diaphragm type pressure reducing valve:

Definition and working principle

Membrane pressure reducing valve is through the membrane as a sensitive element, according to the change of pressure after the valve to control the valve opening, so as to realize the precise control of downstream pressure. When the pressure behind the valve rises, the diaphragm deforms and pushes the spool to move in the closing direction, reducing the medium flow and lowering the pressure behind the valve; on the contrary, when the pressure behind the valve decreases, the diaphragm recovers to its original state, and the spool moves in the opening direction to increase the medium flow and make the pressure behind the valve rise. In this way, the diaphragm pressure reducing valve can maintain the stability of the pressure after the valve.

Structural features

Membrane sensing: The core component of the diaphragm type pressure reducing valve is the membrane, which is characterized by high sensitivity and fast response speed as the pressure sensing element.

Spring Adjustment: The spring plays an adjusting role in the diaphragm type pressure reducing valve, and different outlet pressure values can be set by changing the preload of the spring.

Spool and seat: The sealing structure between the spool and seat ensures that the medium will not leak. At the same time, the movement of the spool can control the flow of the medium, thus realizing the regulation of pressure.

Various structures: diaphragm pressure reducing valve can be single-seat structure or double-seat structure. Single-seat structure is usually suitable for “no total flow” or “tail end”, because it has better shut-off ability. The double-seat structure can increase the flow rate of high values and improve the accuracy of the manipulation pressure.

 Range of applications

Diaphragm pressure reducing valves have a wide range of applications for steam, compressed gases, industrial gases, water, oil and various other liquid substances. In industrial automation control systems, diaphragm pressure reducing valves are often used to regulate the pressure of the medium in the pipeline to keep it within the set range, thus ensuring the safe and stable operation of the system.

performance parameters

Diaphragm pressure reducing valve performance parameters usually include nominal size, nominal pressure, operating temperature and so on. Common nominal size range of DN20~400, nominal pressure range of PN10~100, the operating temperature is usually not more than 540 ℃. In addition, the outlet pressure of diaphragm type pressure reducing valve is stable and adjustable, usually ranging from 1 to 5.5 bar. these parameters can be selected and adjusted according to specific application scenarios.

Installation and Maintenance

Installation: When installing the diaphragm pressure reducing valve, you need to make sure that the inlet and outlet directions of the valve are correct, and install and debug the valve in strict accordance with the product manual. At the same time, you also need to pay attention to the installation location of the valve and the surrounding environment to ensure that the valve can work properly and extend the service life.

Maintenance: It is very important to check and maintain the diaphragm type pressure reducing valve regularly. Need to check the membrane, spring, spool and other parts of the wear and tear, and timely replacement of damaged parts. At the same time, it is also necessary to clean the dirt and impurities inside the valve to ensure the normal operation of the valve.

Cautions

Pressure limitation: Diaphragm pressure reducing valves are usually suitable for low and medium pressure working conditions. In high-pressure environments, other types of pressure reducing valves are required because the diaphragm may not be able to withstand excessive pressure.

Temperature limitations: Diaphragm-type pressure reducing valves are also limited by the temperature at which they can be used. In high temperature environments, the performance of the diaphragm may be affected. Therefore, when selecting a diaphragm pressure reducing valve, the operating temperature range of the medium needs to be considered.

Medium selection: different diaphragm pressure reducing valves are suitable for different media. When selecting, it is necessary to consider the nature of the medium, pressure, temperature and other factors.

In summary, the diaphragm pressure reducing valve is a pressure reducing equipment with excellent performance, compact structure and easy to use. In the process of selection, installation and use, it is necessary to operate in strict accordance with the relevant standards and requirements to ensure its normal operation and prolong its service life.