PTFE lined pneumatic diaphragm control valve
1. General features
Pneumatic diaphragm control valve is the terminal industrial process measurement and control system control device, is composed by pneumatic diaphragm actuator, direct through single-seat, double seat and sleeve valve, etc.
It can automatically change the valve trim position according to the control signal system, changing the flow area between the valve trim and the valve seat, to change the valve drag coefficient, to realize the regulation for the medium flow, pressure and level and other process parameters adjustment.
Pneumatic diaphragm valve use dual-oriented structure, equipped with multiple spring actuators, with compact, light weight, sensitive, valve capacity big, flow characteristics of precision, easy to disassembly.
Widely used for precise control of gas, liquid, steam and other media, process parameters such as pressure, flow, temperature, level maintained at a set value.
Especially suitable for the smaller amount of pressure and small leakage workplace.
2. Technical performance and data
Valve body material: cast iron,cast steel and so on
Pressure class: 1.6MPa,4.0MPa,6.4MPa
Connected way: flange connection according to JB79-59
Temperature scope: normal-20°C~+230°C air cooling fin-60°C~+450°C
Action way: positive (air to close type)or back action (air to open type)
Flow characteristic: equal percent/linear
Leakage: single seat 0.01%×rated Kv
double seat,sleeve seat:0.5%×rated Kv
B. control valve
Control valve is contacted directly with the medium in the pipe, the valve trim act in the valve body, to change the flow area between the valve trim and the valve seat, which change the drag coefficient of the valve, thereby adjusting the process parameters.
Control valve is composed by up cover, valve body, down valve cover, valve trim part, valve seat, stuff and plate.
The action way can be divided into positive way (air to close type) and back way(air to open type).The valve will be from fully open to fully close when input signal pressure change from down limit value to upper limit value;The valve will be from fully close to fully open when input signal pressure change from down limit value to upper limit value.
Pneumatic control single seat valve with good performance of sealing and small leakage, the working pressure difference can not be too high due to the big unbalance force of valve trim.
Pneumatic double seat control valve with the performance of big rated flow KV, small valve trim unbalanced force,stable operation and big pressure difference. It is widely used.But compare with single seat control valve, its leakage is bigger.
The stability and Cavitation resistance of Pneumatic sleeve control valve is better than single seat and double seat valve.
Zhejiang zxda valve control Co., Ltd. is a collection of scientific research, design, manufacturing, sales and service as one of the manufacturers. Specialized is engaged in the research and development and production of the pneumatic valve, the main products are: Pneumatic valve, pneumatic ball valve, pneumatic butterfly valve, pneumatic type knife gate valve, pneumatic Angle seat valve, pneumatic valve, pneumatic control valve, pneumatic feeding valve, pneumatic diaphragm valve, pneumatic pipe clamp valve, pneumatic program control valves, pneumatic sanitary valve, pneumatic actuators, valves, fittings, etc. In the field of pneumatic valve has a wealth of production experience and related experience, exquisite production technology, reliable quality, perfect testing means. Product assembly, explosion-proof solenoid valve, back to the device, the valve positioner and other components, widely used in petroleum, chemical industry, light industry, power station, metallurgy, HVAC, medical, fire, and water treatment and other plumbing field. Products can be assembled explosion-proof solenoid valve, back to the device, the valve positioner and other components. Widely used in petroleum chemical industry, metal smelting, light industry, pharmaceutical, boiler equipment, sewage treatment, printing and dyeing machinery and other fields. As pipe distance single and centralized control by computer operation, is the advanced equipment to realize industrial automation.
Company in the production of the actuator at the same time, and many other famous electromagnetic valve and position feedback switch, filter, the locator manufacturers have good relations of cooperation, can provide users with a variety of supporting services.
The company will with "high quality, good faith" for the purpose, to provide you with satisfactory products and perfect service.
