KOSO valve positioner ---- The main Accessories of the regulating valve
The KOSO valve positioner, according to the structural it can be divided into air-dynamic valve positioner, electric-gas valve positioner and smart valve positioner. It is the main accessory of the regulating valve. It is usually used with the pneumatic regulatory valve. Its output signal controls the pneumatic regulating valve. When the valve movement is adjusted, the displacement of the valve stem is fed back to the valve positioner through a mechanical device.
1:Positioner classification
The valve positioner is divided into pneumatic valve positioner, electric-air valve positioner and smart valve positioner according to the input signal. The input signal of the pneumatic valve positioner is a standard gas signal. For example, the 20 ~ 100kPa air signal, its output signal is also a standard gas signal. The input signal of the electrical valve positioner is a standard current or voltage signal, for example, the 4 ~ 20mA current signal or the 1 ~ 5V voltage signal, etc., convert the electrical signal into electromagnetic forces within the electrical valve positioner, and then output gas signals to dial to move Control valve. The smart electrical valve positioner converts the current signal output by the control room into the gas signal of the driver -regulating valve. According to the friction of the valve stem during the regulating valve, it offsets the unbalanced force generated by the pressure fluctuations of the medium, which makes the valve opening degree corresponding to the control of the control. The current signal output by the room, and the corresponding parameters can be set for intelligent configuration to achieve the purpose of improving the performance of the control valve.
In the direction of the action, it can be divided into one -way valve positioner and a two -way valve positioner. When the one -way valve positioner is used for the piston execution mechanism, the valve positioner only plays a direction. The two -way valve positioner acts on both sides of the piston execution mechanism cylinder, which works in two directions.
The gain symbol of the output and input signal of the valve positioner is divided into a positive valve positioner and a reaction valve positioner. When the input signal of the positive valve positioner increases, the output signal also increases, so the gain is positive. When the input signal of the inverted valve positioner increases, the output signal is reduced, so the gain is negative.
The input signal of the valve positioner is an analog signal or digital signal, which can be divided into ordinary valve positioners and on -site bus electrical valve positioners. The input signal of the ordinary valve positioner is analog pressure or current, voltage signal, and the input signal of the on -site bus electrical valve positioner is the digital signal of the on -site bus.
Whether the valve positioner is with a CPU can be divided into ordinary electrical valve positioners and smart electrical valve positioners. The ordinary electrical valve positioner does not have a CPU, so it is not intelligent and cannot handle related intelligent operations. Intelligent electrical valve positioner with a CPU, which can handle related intelligent operations. For example, non -linear compensation of the front channel can be performed, and the on -site bus electrical valve positioner can also bring function modules such as PID to achieve corresponding operations.
The detection method of the feedback signal can also be classified.
For example, to detect the valve positioner of the valve position signal by a mechanical link; use the Hall effect to detect the displacement method of the valve shift of the valve rod; use the electromagnetic induction method to detect the valve positioner of the valve rod.
2:Principle of Valve positioner :
(1) It is used to adjust the important regulatory system that requires high quality requirements to improve the accuracy and reliability of the positioning valve.
(2) For the occasion of large pressure differences (△ P> 1MPa) at both ends of the valve. By increasing the output force of the execution agency by increasing the pressure of the gas source, the unbalanced force produced by the liquid to the valve core is to reduce the itinerary error.
(3) When the agglutination is high -temperature, high pressure, low temperature, toxic, flammable, and explosive, in order to prevent external leaks, the filler is often pressed very tightly. Therefore Use a positioner to overcome the stagnation.
(4) When the regulating medium is viscous fluid or contains solid suspension, the positioner can overcome the resistance of the medium to move the valve stem.
(5) The regulatory valve for large caliber (dg> 100mm) to increase the output thrust of the execution agency.
(6) When the distance between the regulator and the actuator is above 60m, the positioning device can overcome the stagnation of the control signal and improve the movement response speed of the valve.
(7) Used to improve the traffic characteristics of the regulating valve.
(8) When a regulator controls the two actuators to perform a sub -control, two positioners can be used, and low input signals and high input signals are accepted. Programming.
3：Koso valve positioner is suitable for below koso valve
Common execution agencies are divided into pneumatic execution agencies, electric execution agencies, and there are direct strokes and corner strokes. Used to automatically open and close various valves, windboards, etc.
All model including below:
5200LA,6300LA,3500LB,3800LA,6100LA,6300RB,6400RB,6500RA,7300RA,3500RB,3600RB,3400RB,210C,220C,230C,150,300,600,900,1500,2500,500M,500D,500J,710C,5200RA,5221LA,5227LA,5235LA,524SLA,524LLA,526SLA,526LLA,6110LA,6116LA,6128LA,6136LA,6141LA,6154LA,6254LA,6315LA,6320LA,6330LA,345LA,6360LA,6330LA,6345LA,6360LA,3100,3400,3420,3900,500,3600,3620,4800LA,4800RA,4800DA,3800LA,3800RA,3800DA,,EP1000,331L,331T
