Adjust the pneumatic valve common failures and solutions

Adjust the pneumatic valve and control valve, by accepting conditioning control unit output control signals. In the automatic control of modern factory, adjust the pneumatic valve plays a very important role, the production of the factory depends on the correct allocation and control flow of the medium. These controls both the exchange of energy, pressure reducing, or is a simple container loading, will need some final control elements to complete. Regulating pneumatic valve operation is normal and pneumatic valve repair work has a lot to do. Regulating pneumatic valve failure are diverse, and the emergence of a certain fault may have different reasons.
a, the main actuator fault element
at different positions of the different types of pneumatic valve adjustment and has some key element, the element of the element is also easy to fail.
1, pneumatic, hydraulic actuator
a, diaphragm for diaphragm actuator, is one of the most important components of diaphragm, and under the normal operation of the air supply system, if the actuator is not action, it should be thought that if diaphragm rupture, if not installed. When the metal contact surface of table surface has the defects such as sharp corners, burrs would bring diaphragm burst, and diaphragm leakage can be absolute. In addition, the diaphragm use time is too long, material aging will also affect to use.
b, pneumatic, hydraulic actuator piston is the driving force, so the damage of the piston, wear is absolutely not allowed.
c, gas ( Liquid) This is the way of input pressure to the actuator, so often should check whether the firm seal.
d, push rod to check all the push rod bending, deformation, fall off. Position of push rod connected with the pneumatic valve lever wants firm, to adjust, so as to ensure enough stroke and close the pneumatic valve adjustment.
e, spring to check spring without fracture. Manufacturing, processing and improper heat treatment can make spring break. Some spring under large load, also may rupture.
2, electric actuators,
a, motor to check whether can turn, whether easy to overheat, whether there is enough torque and bonding force.
b, servo amplifier to check whether there is output, whether can adjust.
c, retarding mechanism each manufacturer's different retarding mechanism. So to check its transmission parts - Shaft, gear, worm gear, such as whether the damage, if excessive wear.
d, check the failure cause torque controller according to the concrete structure.
excludes the actuator fault, the fault of the pneumatic valve body itself is as follows:
2, the main fault element
a pneumatic valve, pneumatic valve body to check the corrosion and wear of the pneumatic valve body wall, especially used in corrosive medium and high pressure difference, negative process conditions, such as cavitation, pneumatic valve, must ensure that the compression strength and corrosion resistance, abrasion resistance performance.
b because pneumatic valve, pneumatic valve core core have the effect of regulating and cutting fluid, is the activity of intercepting element, therefore the medium erosion, corrosion, particle collision is the most important, under the condition of high pressure difference, cavitation is more easy to damage, so want to check it whether the parts damage, wear, corrosion, whether to repair or replacement.
c, pneumatic seat pneumatic seat joint surface is the key to guarantee the pneumatic valve closed, its corrosion by grinding the situation is more serious. And as a result of the medium permeability, fixed pneumatic valve seat inner surface often from corrosion and loose thread, especially want to check this part.
d check pneumatic valve, pneumatic valve stem rod connected to the pneumatic valve core, the push rod for loose, if produce excessive deformation, cracks and corrosion.
e, packing check whether ptfe or other packing aging, lack of oil, metamorphism, whether the packing pressure.

f, gasket and o-ring these quick-wear part can't crack damage and aging.


by adjusting the pneumatic valve common fault analysis and processing, reduces the failure rate of pneumatic valve adjustment, increase the adjust the operation cycle of pneumatic valve, thereby further reducing the maintenance cost of the damage of the equipment and equipment, so as to realize the purpose of balance control of processing.





related articles: straight stroke regulating pneumatic valve and the Angle of analysis on the advantages and disadvantages of pneumatic valve travel adjustment electric pneumatic valve working principle and structural characteristics of adjustment