Pneumatic three-way regulating valve
The following is a technical analysis of pneumatic three-way regulating valves, summarizing their structure, principles, applications, and selection points:
Function definition
The pneumatic three-way regulating valve drives the displacement of the valve core through the pneumatic actuator, achieving the diversion (one in, two out), merging (two in, one out) or proportional adjustment of the pipeline fluid.
Split type: Single inlet fluid is divided into two outputs (such as heat exchanger medium distribution); Confluent type: Two inlet fluids are mixed to form a single output (such as chemical proportioning mixing).
Action principle: The pneumatic actuator receives a 4-20mA control signal, drives the valve core to move and change the valve opening, thereby accurately controlling the flow rate, pressure, or temperature.
Core structure
Component characteristics
The valve body is designed with three channels and is mostly made of cast steel or stainless steel (304/316), which is corrosion-resistant.
The valve core has a thin-walled window structure with a large guiding area and smooth operation (DN25-DN300).
Pneumatic diaphragm or cylinder type actuator with high output force and fast response speed.
The control system needs to be equipped with accessories such as locators and filter pressure reducing valves to improve the adjustment accuracy.
2、 Key Performance and Technical Parameters
Project parameters/description
The nominal diameter ranges from DN15 to DN300 (large diameters up to DN600 are suitable for heat exchange systems).
The nominal pressure is PN1.6-6.4MPa (for high-pressure differential conditions, a hard seal structure should be selected).
Linear and equal percentage flow characteristics, suitable for precise proportioning control.
Suitable for temperatures ranging from -40 ℃ to 450 ℃ (high-temperature models require a cooling valve cover).
Leakage level ANSI IV or above (VI hard seal can be selected for harsh working conditions).
