Pneumatic valve maintenance pneumatic valve working principle and operation method

Pneumatic valve maintenance pneumatic valve working principle and operation method

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Pneumatic valve procurement only clear specifications, categories, pressure to meet the procurement requirements of the practice, can be used to control the flow of air, water, steam, all kinds of corrosive media, mud, oil, liquid metal and radioactive media and other types of fluid. It is not perfect in the current market economy environment. Because the pneumatic valve manufacturers for product competition, each in the pneumatic valve unified design idea, different innovation, formed their own enterprise standards and product personality. Therefore, it is very necessary to put forward the technical requirements in detail when purchasing pneumatic valves, and coordinate with manufacturers to obtain consensus, as the annex of the pneumatic valve procurement contract.
Pneumatic valve maintenance:
In the operation of machinery, pneumatic valve plays an important role, the use of it must not only be very skillful, quality should also be guaranteed at the same time, this will require the necessary maintenance of pneumatic valve, valve and maintenance need with scientific attitude, to make the valve maintenance work to achieve the purpose of the effect and application.
Notes for daily maintenance of pneumatic valve:
1, the valve should be stored in a dry and ventilated room, both ends of the pathway must be blocked.
2, long-term storage of the valve should be regularly checked, *** dirt, and on the processing surface coated with anti-rust oil.
3. After installation, regular inspection should be carried out. The main inspection items are :( 1) sealing surface wear. (2) trapezoidal thread wear of stem and stem nut. (3) whether the packing is outdated and invalid, if damaged, it should be replaced in time. (4) After valve maintenance and assembly, sealing performance test should be carried out.
Notes for maintenance of pneumatic valve:
1. The purpose of use and maintenance is to extend the valve life and ensure the reliability of opening and closing.
2, valve stem thread, often friction with the valve stem nut, to apply a little yellow dry oil, molybdenum disulfide or graphite powder, lubrication.
3, do not often open and close the valve, but also regularly turn the handwheel, add lubricant to the stem thread, to prevent biting.
4, outdoor valve, to add a protective sleeve to the valve stem, to prevent rain, snow, dust rust.
5. If the valve is mechanical to be moved, add lubricating oil to the gearbox on time.
6, always keep the valve clean.
7. Always check and maintain the integrity of the other parts of the valve. If the fixed nut of the handwheel falls off, it should be matched and cannot be used, otherwise it will grind the square of the upper part of the valve stem, gradually losing the reliability of the match, and even cannot start.
8, do not rely on the valve to support other heavy objects, do not stand on the valve.
9, the valve stem, especially the thread part, to often wipe, the lubricant has been dirty by dust to be replaced with new, because the dust contains hard debris, easy to wear thread and stem surface, affect the service life of pneumatic single seat regulating valve.
Pneumatic valve working principle and operation method
The working principle of pneumatic valve is introduced:
The output point of the pneumatic valve is the pneumatic actuator. Its working mode is to drive the valve switch and adjust with the help of compressed air. According to the classification of control mode can be divided into pneumatic valve switch type and regulating type of two categories. Type pneumatic switch valve contains pneumatic actuators, valves, manual operating mechanism, air source treatment sanlian pieces, solenoid valves, limit switches, muffler, quick connector, air compressor, tracheal etc parts, the manual operating mechanism, limit switch, air source treatment sanlian pieces, muffler, quick plug connector can be selected freely according to the site condition. Pneumatic control valve includes pneumatic actuator, valve, manual operation mechanism, electric-gas valve positioner, air source treatment triad, muffler, quick plug connector, air compressor pipe, etc., here the manual operation mechanism, muffler, quick plug connector can also be freely selected according to the site conditions. Pneumatic valves are widely used in the automatic control of water, air, steam, mud, oil, liquid metal and other media.
Pneumatic valve operation precautions:
First, open the valve, must pay attention to:
1. Check whether the oil can on the air filter and pressure reducer has been refueled (lubricating oil);
2, check whether the pipeline is clean if there is debris, it is recommended to install pipeline filter in front of the valve
3. Then go on to control the origin
4. After adjusting the air source pressure, piston type (0.4-0.7) kg, film type (0.1-0.2) kg
5, on the power supply (switching type is voltage) or (regulating type current or voltage signal)
6, and then adjust or open control
Two, close the valve, must pay attention to:
1, cut off the control signal (voltage or current)
2. Adjust the air filtration pressure to zero
Pneumatic valve operation method:
1. The opening and closing of the pneumatic valve are in clockwise direction. Pneumatic valve in the opening and closing pipe network, the opening and closing revolution should not be too much, even the large diameter valve should be in 200-600 revolution.
2. In order to facilitate the opening and closing of the pneumatic valve, the opening and closing moment should be less than 240N-m under the condition of plumber pressure. Pneumatic valve opening and closing operation end should be square tenon, and the size should be standardized, and face the ground, so that the staff can directly operate on the ground. Valves with wheel plates are not suitable for underground pipe networks.
3. In order to ensure that the opening and closing of the pneumatic valve is not excessive, the scale line of the opening and closing degree of the pneumatic valve should be strikingly cast on the gearbox cover or the shell of the display plate after the change of direction, and should face the ground. When the opening and closing adjustment is accurate, it should be locked with rivets.
4. Pneumatic valve opening and closing operation in the pipe network is not suitable for well operation. If the operating mechanism and display plate of the pneumatic valve is less than 1.5 meters on the ground, a stable and reliable extension rod facility should be set up, so that the staff can observe and operate on the ground.


Post time: Sep-27-2022

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