Analysis: the main control valve selection and related accessories for valve positioner is a major attachment of pneumatic actuators, and 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. The following cases, to match the locator: 1 high and medium pressure, differential pressure of age; 2, the calibre of the valve ( DN > 100). ; 3, high temperature or low temperature regulating valve; 4, need to improve the operation speed of regulating valve; 5, using the standard signal, the executive body of the spring operating non-standard ( 20 ~ 100 kpa outside of the scope of spring) ; 6, used for routine control; 7, make the valve reverse action ( Gas closed type and open type conversion to each other) ; 8, when need to change the flow characteristic of valve ( Can change the positioner CAM) ; 9, no spring actuator or piston actuators, moves to achieve proportional; 10 to operate pneumatic actuators, electricity signal, must distribution - Gas valve locator. 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. I plant production regulator usually from dandong of solenoid valve solenoid valve factory. Dandong solenoid valve factory imported German HERION solenoid valve technology has advanced localization company. The two type of moving tee single electric solenoid valve ( Including explosion-proof) ; 幅, SB024000 series ( Specification: 3, 5, 8, 10, 12, 15, 20, 25, 40, 50 mm) ; Two to four, 5) Single electric solenoid valve A102ED - SF025000 series ( Specification: 5, 8, 12, 15, 20, 25 mm) 。 Straight moving type advantages: 1. Working medium can start work from 0 mpa; 2. To install and use; 3. Working medium is suitable for water, gas, oil; 4. Action slimming Dian shooted ⑿ read fan deepened? . Low power, long life, high frequency; 6. Explosion-proof type head mounted with increasing combined with flameproof, users convenient wiring. Straight-pilot two tee P411EI - single electric control, double electric solenoid valves WFM80200 series ( Specification: 6, 12 mm) ; Two five-way P413EI - single electric control, double electric solenoid valves WFM2630 series ( Specification: 6, 12 mm) 。 When choosing technical parameters, please see the dandong solenoid valve factory product samples. 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, another role is to enlarge or reduce the signal. 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. 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 valve, cylinder, spraying equipment and small pneumatic tools for gas source and voltage stabilizer. Self-locking valve ( A Industrial Valves) 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. 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. 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 this paper, the keyword search: regulating valve
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