Valve positioner.
Valve positioner is a pneumatic actuator of the main attachments, supporting it with the use of pneumatic actuators, used to improve the accuracy of the valve position, glue stick the valve stem to overcome the unbalanced force of friction and the impact of the media to ensure that the valve in accordance with the regulator to signal to achieve the correct positioning.
The following cases, to go with locator:
1, medium pressure, high pressure big time;
2, large diameter valve (DN> 100);
3, high or low temperature control valve;
4, the need to improve movement speed control valve;
5, glue gun using standard signal, the operation of non-standard spring when the implementing agencies (20 ~ 100KPa spring outside the range);
6, for sub-process control;
7, the valve to achieve the reverse action (air to close each open-type gas conversion);
8, the need to change the flow characteristics of the valve when (you can change the positioning cam);
9, no spring actuator or piston actuator, to achieve the ratio of action;
10, electrical signals to operate the pneumatic actuator must Distribution - gas valve positioner.
Solenoid valve.
When the system need to achieve control of process control or two, you need equipped with solenoid valves. Selection of solenoid valves, in addition to consider the AC and DC power supply and voltage, frequency, must pay attention to the role of the solenoid valve and control valve type of relationship, can be equipped with "normally open" or "normally closed."
If the solenoid valve requires increased capacity to shorten the operating time, you can use two parallel solenoid valve or the solenoid valve as a pilot and large-capacity pneumatic valve actuators following the combinations used.
I plant the control valve solenoid valve usually Dandong plant supporting the use of the electromagnetic valve. Solenoid valve Factory Dandong HERION company introduced advanced German technology has been made of the solenoid valve. Including direct action type two three single electronically controlled solenoid valve (with proof); A101ED-SB024000 Series (Size: 3,5,8,10,12,15,20,25,40,50 mm); two four- (e) through a single electronic control valve A102ED-SF025000 series (Size: 5,8,12,15,20,25 mm). Direct action type advantages: 1. The working media to work from 0MPa; 2. To any installation; 3. The working fluid for water, gas, oil; 4. Is sensitive, reliable performance; 5. Low power, long life, Operating frequency is high; 6. proof by installing the first use of the combination of type and explosion-proof, the user easy wiring.
Three single-pilot-type two electronically controlled, dual electrically controlled solenoid valve P411EI-WFM80200 series (Size: 6,12 mm); two five-way single solenoid, double solenoid valve P413EI-WFM2630 Series (Size: 6,12 mm .)
When selection of technical parameters, please see samples of plant products Dandong solenoid valve.
Pneumatic relay.
Pneumatic relay is a power amplifier, it will pressure signal to the distant place, eliminate the signal delay caused by lengthening the pipeline, mainly for on-site regulation of the transmitter and the central control room instruments, between or in the regulator and the scene between the control valve, there is a role is to zoom in or out signals.
Converter.
Converter is divided into gas - electric converter and electric - gas converter, and its function is to achieve air, a certain relationship between the electrical signal conversion, signal manipulation is mainly used in power when the pneumatic actuator or 4 ~ 0 ~ 10mA 20mA electrical signal conversion or 0 ~ 100KPa air signal into the 0 ~ 10mA or 4 ~ 20mA electrical signal.
Air filter regulator.
Air filter regulator is a kind of industrial automation instruments in the attachment, and its main function is to filter the compressed air from the compressor and purification of stability at the required pressure values, it can be used for all types of pneumatic instruments, solenoid valve , cylinder, spray equipment and pneumatic tools, small gas source and regulator device.
Self-locking valve (to secure his position valve).
Self-locking valve is a device to keep the valve position. Pneumatic control valve when the gas supply failure signals the device can cut off the gas source, the membrane chamber or cylinder pressure signal to maintain the state of the moment before the failure, so that the valve position is also maintained the position before the failure, since to secure his position effect.
Valve position transmitter.
When the control valve away from the control room can be an accurate picture of the scene for less than a closing position of the valve, it is necessary with a valve 传送器 upcoming valve opening displacement of the body, according to certain rules to convert electrical signal to the control room, This signal can be reflected in the continuous opening of the valve of any signal can also be considered to be the inverse of the valve positioner action.
Limit switch (back to the hearing device.)
Travel switch valve switch reflects two extreme positions, and also sends the signal indicating device, the control room can be based on this signal, the switch state of rebellion-off valve in order to take corresponding measures.