Gate locator
Valve positioner is pneumatic the implementation of the main accessories, pneumatic actuators and supporting the use of valve used to improve the position precision, overcome the valve stem friction and medium unbalanced force influence, so as to ensure that the valve according to the regulator to signal to realize the correct localization.
The following case, must be fitted with locator:
1, medium high pressure, differential pressure big,
2, the control valve of the big caliber (DN > 100);
3, high or low temperature control valve,
4, needs to improve regulating valve movement speed;
5, use standard signal, operation of non-standard spring actuator (20 ~ 100 kpa outside of the spring range);
6, used in process control points;
7, make the valve to realize reverse action (gas close type and open mutual conversion);
8, need to change valve flow characteristics (can change locator CAM);
9, no spring actuator or piston actuator, to achieve proportional action;
10, electricity signal to operate pneumatic actuators, must distribution - gas valve positioner.
Electromagnetic valve
When the system need to realize the program control or two control, need with electromagnetic valve. Choose electromagnetic valve, which should be considered except the ac, dc power and voltage, frequency outside, must pay attention to the electromagnetic valve and control valve mode of action relation, but with "normally open type" or "normally closed type".
If demand increased electromagnetic valve capacity, to shorten the action time, can coordinate use 2 sets of electromagnetic valve or electromagnetic valve as a leading valve and large capacity pneumatic servomotor combination to use.
My factory production regulator usually and dandong electromagnetic valve factory production of electromagnetic valve supporting the use. Dandong electromagnetic valve factory the introduction of Germany advanced HERION company electromagnetic valve technology has localization. Straight moving type of two tee single electric solenoid valve (including explosion-proof); A101ED - SB024000 series (specification: 3, 5, 8, 10, 12, 15, 20, 25, 40, 50 mm); Two 4 (5) through single electric solenoid valve A102ED - SF025000 series (specification: 5, 8, 12, 15, 20, 25 mm). Straight moving type advantages: 1. The working medium can be from 0 mpa began to work; 2. Can be placed anywhere use; 3. Working medium suitable for water, gas, oil, 4. Action is sensitive, reliable performance, 5. The low power, long life, high operating frequency, 6. Explosion-proof head adopts increase installation type and flameproof, combining the user terminal is convenient.
The guiding two tee single electric control, double electric solenoid valve P411EI - WFM80200 series (specification: 6, 12 mm); Two five single electric control, double electric solenoid valve P413EI - WFM2630 series (specification: 6, 12 mm).
When choosing, technical parameter please see dandong electromagnetic valve factory the product sample.
Pneumatic relay
Pneumatic relay is a kind of power amplifier, it can will pressure signal to the distant place, eliminate the signal line extension brought about by the lag, mainly used for the transmitter and the central control room between the monitoring instrument, or in the regulator with the field regulator between, still have a kind of role is to enlarge or reduce signal.
converter
Converter is divided into gas - electric converter and electric-pneumatic transducer, its function is to achieve a certain relationship between gas, electrical signals mutual conversion, mainly used in power signal control pneumatic actuators will 0 ~ 10 ma or 4 ~ 20 ma electric signal conversion or 0 ~ 100 kpa gas signal into 0 ~ 10 ma or 4 ~ 20 ma electric signal.
Air filtering pressure reducing valve
Air filtering pressure reducing valve is one of the industrial automation instrument accessories, its main function is to come from air compressor of filtering compressed air purification and will stabilize the pressure to the desired value, can be used for all kinds of pneumatic instrumentation, electromagnetic valve, cylinder, spraying equipment and small pneumatic tool for source and voltage stabilizer.
Latching valve (similar to a valve)
Latching valve is to keep valve position a device. Pneumatic control valve when air when a fault happens in this device can will air signal cut off, make film chamber or cylinder pressure signal to remain in a moment before failure of state, thus make valve position also maintain before failure in position, rise to protect a function.
Valve position transmitter
When valve away from the control room to less than field can accurately understand valve switch position, will be equipped with valve position transmitter, the valve opening institutions displacement quantity, according to certain rules into electric signal to the control room, the signal can be reflect the valve opening of any of the continuous signal, but also can be considered a valve positioner inverse action.
Travel switch (back) apparatus)
Travel switch reflect valve switch two extreme position, and at the same time give indication signal device, control room can according to the signal, Julian off valve switch state in order to take corresponding measures. |
