The choice of pneumatic control valve related accessories

pneumatic control valve is one of the important link of the automation control process of instrument, the right selection is very important to the normal operation of the system, pneumatic control valve selection in addition to the pressure, temperature, diameter, material and other regulator structure commonly used parameters need to be implemented, but also pay attention to the related accessories, pneumatic control valve of the main accessories: valve positioner, solenoid valve, valve position feedback, air filtering pressure reducing valve, valve, pneumatic relay etc, the following describe principle of type selection of main accessories: a, valve positioner valve positioner is the main accessories, pneumatic actuators with pneumatic actuators, is used to improve the position precision of the valve, to overcome the friction of valve stem and medium the influence of unbalanced force, to ensure that the valve according to the regulator to signal to achieve the correct positioning. 4 - valve position is used 20 ma control signal is converted into pressure signal to pneumatic actuator, and thus drive the regulator for regulating function. positioner is divided into mechanical locator and intelligent locator, intelligent positioner than mechanical control precision is high, and low gas consumption, also can with the function of HART protocol. Second, the electromagnetic valve when the system needs to implement program control or two control, need with electromagnetic valves. When choosing solenoid valve, in addition to consider ac, dc power supply and voltage, frequency, must pay attention to the solenoid valve and control valve type, the relationship between with 'normally open' or 'normally closed'. If demand increase the capacity of solenoid valve, to shorten the action time, can be used with two solenoid valve or the solenoid valve as a pilot valve with large capacity using pneumatic relay combination. Three, pneumatic relay relay is a kind of power amplifier, it can pressure signal to the distant place, due to the lag of signal line extension, is mainly used in the scene between the transmitter and the adjustment of the central control room instrumentation, or between the regulator and the regulator, and a role is to enlarge or reduce the signal. Four, the converter transformer is divided into gas Electric converter and electric - Converter gas, its function is to achieve a certain relationship between gas, electrical transformation, it is mainly used for when electricity signal control pneumatic actuators will be 0 ~ 10 ma, or 4 ~ 20 ma electrical signal conversion or 0 ~ 100 kpa gas signal is converted into 0 ~ 10 ma, or 4 ~ 20 ma electrical signal. Five, the air filtering pressure reducing valve air filtering pressure reducing valve is one of the industrial automation instrument accessories, its main function is the compressed air which comes from air compressor filter purification and will to the desired pressure stable value, can be used for all kinds of pneumatic instrument, electromagnetic Industrial Valves, cylinder, spraying equipment and small pneumatic tools for gas source and voltage stabilizer. Six, self-locking valve ( A valve) Self-locking valve is a device of valve position. Pneumatic - valve failure occurs when the origin, the device can cut off the gas source signals, make the film chamber or cylinder pressure signal before failure moment condition, thus makes the valve position also maintain before the fault position, the position. Seven, valve position transmitter when regulator is far away from the control room for less than the scene can accurately understand the switch position, will be equipped with valve position transmitter, the valve opening mechanism displacement, converted to electrical signal to the control room according to certain rule, the signal can be reflect the continuous signal of any valve opening, can also be considered to be the valve positioner inverse action. Eight, travel switch ( Back to the news) Travel switch reflect the valve switch two extreme position, and at the same time sends out the instruction signal device, can according to the signal control room, from off the switch state of the valve in order to take corresponding measures.
In the office, various are considered essential since they are used to achieve particular tasks in the office. Among these , flow control valve, resilient seated valve, and os & y valve fire protection are widely used.
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