WCB CF8 CF8M Pneumatic Diaphragm Type Pressure Regulating Control Valve With Positioner

WCB CF8 CF8M Pneumatic Diaphragm Type Pressure Regulating Control Valve With Positioner

Product introduction:

Pneumatic precision diaphragm control valve also known as regulating valves, which including: SZJHP pneumatic precision diaphragm single seat regulating valve, SZJHM pneumatic precision diaphragm sleeve regulating valve and SZJHN pneumatic precision diaphragm double seat regulating valve, which adopts a top guide structure and is equipped with a multi spring actuator. It has the advantages of compact structure, light weight, sensitive action, S-shaped fluid channel, small pressure drop loss, large valve capacity, accurate flow characteristics, and convenient disassembly and assembly. Widely used for precise control of process parameters such as pressure, flow rate, and liquid level in gases, liquids, and other media to maintain a given value. Especially suitable for working situations where small leakage is allowed and the pressure difference between the front and back of the valve is not significant.
There are various types of pneumatic precision diaphragm regulating valves, including standard type, regulating cut-off type, pipe sealing type, jacket insulation type, etc. The nominal pressure rating of the product includes PN16, 40, and 64; The nominal diameter range is DN20-300. Suitable for various liquid temperatures ranging from -200 ℃ to+560 ℃. The leakage rate standard has level IV or VI, and the flow characteristics are linear or equal percentage


Product technical parameter:

Product features:

1. The input-output characteristics of the actuator of the pneumatic diaphragm control valve show a linear relationship, that is, there is a linear relationship between the output displacement and the input signal pressure. The output displacement is called the stroke and is displayed on the stroke display board. Some reaction actuators also install valve position displays on the upper part of the capsule to display the valve position. There are six specifications for the stroke of domestic pneumatic diaphragm control valve actuators, including 10mm, 16mm, 25mm, 40mm, 60mm, and 100mm.
2. The effective area of the diaphragm of the actuator is directly proportional to the thrust, and the larger the effective area, the greater the thrust of the actuator.
3. The structure of the positive and negative action actuators is basically the same, consisting of an upper diaphragm cover, a lower diaphragm cover, a membrane membrane, a push rod, a spring, adjusting components, a bracket, and a stroke display board.
4. The main difference between the structure of positive and negative action actuators is that the input signal of the negative action actuator is located at the lower part of the diaphragm box, and the outgoing push rod is also located at the lower part. Due to the good sealing of the diaphragm, there is no need to seal at the outlet of the valve stem.
5. The initial force of the spring can be changed by adjusting the adjusting element, thereby changing the thrust of the actuator.
6. The pneumatic diaphragm control valve can be equipped with a self-locking device to achieve self-locking and positioning of the control valve.
7. Valve positioners can be added to achieve valve position detection and feedback, improving control performance.
8. A displacement conversion device can be added to the pneumatic diaphragm control valve to convert linear displacement into angular displacement, which is used to rotate the valve body.
9. The pneumatic diaphragm control valve can be equipped with a hand-wheel mechanism, which can be used for degradation operation in case of automatic control failure, improving system reliability.