The working principle of pneumatic pneumatic control valve actuator

Found in practice due to there are more and more control mode and means, in actual industrial raw often and industrial control, pneumatic pneumatic - valve used to control actuator method are many, there are several commonly used. Pneumatic pneumatic - valve working principle of the intelligent display control intelligent display based on single chip microcomputer development is used to monitor the valve working condition, and pneumatic control valve of pneumatic control valve opening work of the instrument, it through two lines of position sensor to monitor the working state of the valve, judging pneumatic pneumatic control valve is in a state of valve open or close the valve, through programming records of valve switch Numbers, there are two road and valve opening and the corresponding 4 ~ 20 ma output and bipedal normally open normally closed contacts. Through these output signal, control the action of valve. According to the requirement of the system, the intelligent valve display from the hardware can be divided into three parts to design: analog parts, part Numbers, button/show. Pneumatic pneumatic - valve analog circuit part mainly includes power supply, analog input circuit, analog output circuit three parts. The whole circuit energy part power supply, including analog circuit, digital circuit and display of energy supply. In order to realize the remote control valve open read, need the valve opening information transmitted to other control instrument, at the same time control instrument table can set for a valve opening from a far country, and system requires 1 road 4 ~ 20 ma analog input signal and 1 ~ 2 road 4 ~ 20 ma analog output signal. Analog input signal by A/D conversion into corresponding to the valve opening after the digital signal to digital part of the single chip microcomputer, after filtering processing on it in SCM can output. Valve opening information through D/A converted into analog signal output, is used to pick up the display shows the valve opening or connect to other control equipment. In this design system, all of the amount of digital data are adopts serial input and output method, in order to save the chip resource and space, the input amount of 4 ~ 20 ma model proposed when converted to digital quantity, using existing 4-way DA chip combined with single chip computer system resources for eight of the AD. Pneumatic valve actuator control mode using compressed air driven actuators in combination of multiple sets of pneumatic piston movement and force to beam and the characteristics of the curve track, drive tubular spindle rotation, compressed air disks to each cylinder, changed the direction of gas in and out of position to change the direction of spindle rotation, according to the load ( Valve) The requirements of rotary torque required, can adjust the cylinder number combination, driving load ( Valve) Work. Two five-way solenoid valve which is equipped with double-acting pneumatic actuators, two is two position control: open - , there are five tunnel ventilation, 45 is one connected with gas source, two external and double-acting cylinder chamber in and out of the port connection, two with the internal chamber in and out of the port in succession, you may refer to the working principle of concrete working principle of the double-acting pneumatic actuators.