Fisher control valves are divided into electric control valves, pneumatic control valves and manual control valves, and the following mainly introduces pneumatic control valves and electric control valves.
Fisher pneumatic control valve is to use compressed air as the power source, the cylinder as the actuator, and with the help of electric/pneumatic valve positioner, converter, solenoid valve, position retention valve and other accessories to drive the valve, (the spool seat moves relatively) to achieve switching or proportional adjustment, receive the control signal: 4-20mA current signal and convert the electrical signal into a pressure signal (completed by the positioner or solenoid valve) to adjust the flow, pressure, temperature and other process parameters of the pipeline medium.
Fisher Pneumatic Control Valve Advantages:
The structure is simple, the action is reliable and stable, the output force is large, the installation and maintenance is convenient, the price is cheap, and the fire and explosion are proper. Disadvantages: large response time, signal is not suitable for remote transmission.
Fisher Electric Control Valve Advantages:
Fisher electric actuator receives a current signal of 4-20mA, and drives the valve core stem to produce relative displacement (linear stroke, angular stroke) through the forward and reverse rotation of the motor to change the cross-sectional area between the valve core and the valve seat, and control the flow, temperature, pressure and other process parameters of the pipeline medium. Advantages of electric control valve: fast action, suitable for long-distance transmission; Energy-saving (electricity is consumed only when working), environmentally friendly (no carbon emissions), quick and easy to install (no need for complex pneumatic lines and air pump workstations). Disadvantages: complex structure, small thrust, expensive price, suitable for explosion-proof requirements are not too high and lack of gas source occasions.
Fisher Fisher control valves
Control valve = actuator + valve body component wherein, the actuator is the pushing device of the control valve, which generates the corresponding thrust according to the size of the signal pressure, so that the push rod produces the corresponding displacement, so as to drive the spool action of the control valve.
Thin film actuators are divided into 657 and 667, and their advantages and disadvantages are introduced below
Merit:
The structure is simple and reliable.
Shortcoming:
The pressure of the diaphragm is low, the maximum pressure of the diaphragm chamber can not exceed 250KPa, and the spring should offset most of the pressure, and the remaining output force is very small. On the other hand, the air source of the plant is usually 500-700KPa, it only uses 250KPa, and the air pressure is not fully utilized, which is not desirable, and the piston actuator solves this problem.
In order to make full use of the air pressure of the plant to increase the output force of the actuator and reduce its weight and size, the piston actuator was created.
Pneumatic control valve output characteristics: The output displacement is proportional to the pressure signal, and when the signal pressure passes through the air chamber, a thrust is generated on the membrane, which makes the push rod move and compress the spring. When the reaction force of the spring is balanced with the thrust generated by the pressure of the signal on the film, the pushrod stabilizes in a new position. The greater the signal pressure, the greater the thrust on the film, the greater the spring reaction force that balances it, and the greater the displacement of the pushrod. The displacement of the actuator is the linear output displacement of the actuator, which also becomes the stroke.
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