Product Features

Axial flow piston structure with minimal pressure loss

※ Pressure balanced structural design

※ Double sealed structure, more reliable sealing

※ Double acting piston pneumatic actuator, fault holding type action safe and reliable

※ Double layer equal percentage or linear perforated sleeve design, high control accuracy

The General Administration of Quality Supervision, Inspection and Quarantine of China has issued a TS-A safety shut-off valve manufacturing license

Product parameters

Working principle

Axial flow pneumatic control valve refers to an axial streamlined flow channel with a straight symmetrical and unobstructed inner cavity of the valve body. This internal cavity design makes it very easy for the medium to pass through, and the fluid is evenly distributed at various positions inside the valve, thereby reducing the impact of local high-speed flow, turbulence, jet flow, etc., improving the stability of the valve, and minimizing turbulence and noise.

The main components of an axial flow pneumatic control valve are the axial flow main valve, actuator, control system, and accessories. The valve body of the main valve is a complete cast body, and the valve core moves along the centerline of the valve. The main valve mainly relies on the change of the relative flow area between the valve core and the sleeve to regulate the flow rate and pressure of the medium, thereby achieving the purpose of throttling regulation. The valve core is operated through a 90 ° angular transmission mechanism, which consists of a pair of sliding gears located on the valve stem and push rod, respectively. The error between the gears is very small, ensuring that there is no lag in the gear transmission mechanism and no "movement" between the valve stem and push rod. The flat toothed bed is isolated from the fluid by two primary seals located on the valve stem and guide sleeve.

The actuator is a double acting piston cylinder assembly, and the regulating valve is controlled by a pneumatic control system to achieve valve opening control.

Normal regulation: When the system is in normal working condition, the solenoid valve is energized and the hydraulic circuit is opened. When the control signal of 4-20mA increases, the forward output pressure of the locator increases (the reverse output pressure decreases). Through the control port of the forward (reverse) amplifier, the output pressure of the forward amplifier increases (the output pressure of the reverse amplifier decreases), and the pressure in the lower chamber of the actuator piston increases (the pressure in the upper chamber decreases). The actuator pushes the valve push rod upward (usually in the direction of valve opening); When the control signal of 4-20mA decreases, the forward output pressure of the locator decreases (the reverse output pressure increases). Through the control port of the forward (reverse) amplifier, the output pressure of the forward amplifier decreases (the output pressure of the reverse amplifier increases), the pressure in the upper chamber of the actuator piston increases (the pressure in the lower chamber decreases), and the actuator pushes the valve push rod downward (usually in the direction of valve closing).

Fault holding function: When power is cut off, the solenoid valve acts, the pneumatic control valve loses power, the air source changes direction, the hydraulic circuit is cut off, the actuator is in a locked state, and the original opening is maintained; Similarly, when the gas source is lost, the pneumatic valve loses power and the gas source changes direction, cutting off the hydraulic circuit, and the actuator is in a locked state, maintaining its original opening.

Product Structure Diagram

Product dimension diagram

Size Connection

interface size

Product ordering and selection

Selection of Pneumatic Control Valve

Other special configuration requirements

For example, please indicate whether electric heat tracing and flow characteristics are required.