The ZXS/ZXM series pneumatic/electric angle-type control valves adopt a modular design with high versatility and interchangeability, featuring a compact structure. The conventional top-guided structure, when combined with a lower guide structure added beneath the valve seat, can be applied in various high-stability and high-pressure-differential scenarios, meeting user requirements. Specifically designed for media with high viscosity, easy crystallization, particulate matter, and 90° bends, these angle-type control valves have no dead angles in their main bodies, facilitating easy cleaning, and are thus particularly suitable for use in the food industry.

This series of products comes in various types, including standard, radiating, low-temperature, regulating cut-off, and bellows-sealed models. The nominal pressure ratings are P(MPa) 1.6, 2.5, 4.0, 6.4, 10.0 (150lb, 300lb, 600lb); the valve body size range is DN(mm) 20–400 (3/4"–16"); suitable for fluid temperatures ranging from -196 to +560°C across multiple ranges; leakage standards include Class IV, V, VI; flow characteristics include linear and equal percentage. A variety of specifications are available for selection.

Working Principle

Pneumatic ZXS:
The positioner receives standard current signals or computer signals and converts them into valve position setpoints. The linear displacement of the actuator is converted into angular displacement through a connecting device and measured by a position sensor, which feeds back to the microprocessor.
The microprocessor compares the actual valve position feedback value with the setpoint. Upon detecting a deviation, it outputs a pulse-width modulation (PWM) command to the positioner valve based on the magnitude and direction of the deviation. The positioner valve adjusts the inlet or outlet volume of the actuator membrane according to the control command.

Electric ZDLS:
After standard current signals or computer signals are converted via A/D, they enter the intelligent signal acquisition and control unit of the intelligent electric actuator.
The signal acquisition and control unit detects the input signal and position feedback signal in real-time. When these two signals are unbalanced, it outputs a pulse-width modulation (PWM) command to the bidirectional controllable silicon based on the magnitude and direction of the deviation, making it conductive and driving the motor to rotate in the direction that reduces the deviation. This, in turn, drives the speed-reducing mechanism and changes the valve opening.

Control Mode

The control mode is driven by PWM (Pulse Width Modulation):

• Full-speed state: When the control deviation is large, a continuous signal is output.
• Medium-speed state: When the deviation is not large, a pulse signal is output.
• Slow-speed fine-tuning: When the deviation is very small, a smaller pulse signal is output.
• Position holding: When the deviation is within the valve regulation accuracy range, no control command is output