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Valve Repair
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| Two types of pneumatic control |
| Article source：江阴市欧雷斯阀门维修厂 Update Time：2012-11-3 |
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Pneumatic control valve maintenance, can be divided in accordance with its action the: gas open type pneumatic control valve repair gas off pneumatic regulating valve repair type two. Jiangyin Oulei Si valve repair factory now have you explain the: gas open type pneumatic control valve maintenance, when the film head air pressure increases, the valve to increase the opening direction of action, when the input air pressure is reached limit The valve is in the fully opened state. Conversely, when the air pressure decreases, the valve operation in the closing direction, in the absence of air input, the valve is fully closed. It is sometimes the gas open type valve, also known as fault-closing type (Fail to Close FC). Gas-off (Air to Close) action coincided with the direction contrary to the gas open type. When the air pressure is increased, the valve closing direction movement; the air pressure is reduced or is not, the valve to the open direction or fully open until. It is sometimes referred to as the fail-open type (Fail to Open FO). Gas pneumatic control valve to open or air to close, it is usually a way through the different positive and negative role of the implementing agencies and the valve state structure assembled.
Pneumatic valve repair, why the gas open type or gas-off? The gas open gas shut choice starting to consider the safety point of view of the production process. When the gas source is cut off, the regulating valve in the closed position safe or open position safety? For example, a furnace combustion control, regulating valve installed in the fuel tracheal trail based on the temperature of the furnace or heating the material in the furnace outlet temperature to control the supply of fuel. At this time, the gas valve open should use the safer, because once the gas source to stop the supply valve is closed than the valve is fully open more appropriate. If the supply is interrupted, the fuel valve is fully open, will make heating excessive risk. Another example is a heat exchanger with cooling water equipment, hot material within the heat exchanger and the cooling water is cooled by heat exchange, the regulating valve is mounted on the cooling water pipes, with the temperature of the material after the heat exchanger to control the amount of cooling water in The gas source is interrupted, the regulating valve in the open position safer, should use gas off (FO) regulating valve.
Gas open to change as the gas-to-close or air-to-close change for the gas open as smart valve positioner control valve, can easily switch each other at the scene. But there are also a number of occasions, do not want to fault the valve is fully open or fully closed position, the operation is not allowed, but the failure to maintain the original position before the last breath. At this time, you can take some other measures, such as to secure his position valve or set accident special air storage tanks and other facilities to ensure that.
What is a pneumatic control valve repair valve positioner
The positioner is a the primary accessories regulating valve, substantially supporting the use of the pneumatic control valve, and it accepts the output signal of the regulator, and then to its output signal to control the pneumatic control valve, when the adjustment of the valve operation, the displacement of the valve stem and through The mechanical device is fed back to the valve positioner, valve position status through an electrical signal to the host system.
Pneumatic valve positioner valve positioner can be divided into its structure and working principle, electric - gas valve positioner and the smart valve positioner. Positioner can increase the output power of the regulating valve, reducing the adjustment signal transmission lag and accelerate the moving speed of the valve stem, and possible to improve the linearity of the valve, overcoming the frictional force of the stem and eliminate the influence of the unbalanced force, so as to ensure the correct positioning of the regulating valve. Commonly executing agency pneumatic actuators, electric actuators, straight trip points of the angular travel. Used to automatically, manually the various cutting the door opening and closing, wind deflector
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