The valve positioner has undergone the development of the current digital valve positioner with the current digital valve positioner, the regional bus valve positioner, but their basic principles and main functions are not different.
electro pneumatic converters can be used in all applications that require electrical-air signal conversion
The electro pneumatic valve positioner can only be used with the gas transfer actuator.
When using an electrical signal to control the pneumatic actuator, the signal is required to convert the signal, convert the electrical signal to the gas signal, the electro pneumatic converter and the electro pneumatic valve positioner have this ability;
In the ideal state of pneumatic actuec, the motion position (valve stroke) should be a strict relationship with the signal, but in actual use, due to changes in the actuator load (such as the force of the valve front and rear pressure differences), position and The relationship between signals will deviate. The electro pneumatic valve positioner has the ability to correct this deviation, and the electro pneumatic converter does not have this function.
How to install the valve positioner!
Positioner and actuator installation is correct or not, directly affect the results of the positioner, is installed properly secured to the mounting plate with reasonable positioner connected to a connection on the actuator to the positioner mounting accessories one. 1, the first positioner associated with mounting plates together, the method is to open the positioner case, with three M5 * 20 screws through the shell with three-hole mounting board. 2, the feedback means is connected to the actuator positioner, the adjustment nut on the valve stem is released the brace plate in the feedback member interposed between the pointer and the connecting nut. 3, with the mounting plate positioner associated with the actuator yoke has two screw holes Screw M10 * 15 according to the desired fixed position. 4, the feedback connecting pin member inserted in the positioner feedback web cam feedback dry open channel. 5, different types of actuators should ensure that when the 50% valve position, the lever cam to be in a horizontal position. 6, the various parts of the installation connected to adjust the fixed locking.
Contact: Vison Chan
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Add: EAA Central Industrial Zone,Wenzhou,Zhejiang Province,China