Axial control The valve is a terminal execution device in the automatic adjustment system, which regulates the production process by receiving the control signal. The regulating valve has high performance stability, low price, fireproof and explosion-proof function, and can be used with pneumatic and electric regulating instruments with high degree of automation.
The advantages of the Axial control valve during use are:
1. Agile action, able to complete various adjustment commands in time;
2. Used in conjunction with large cylinders, with a large moment driving force;
3. The performance is stable and can operate normally under the harsh working environment;
4. High security performance.
The normal operation and agility of the Axial control valve will have a direct impact on production quality and efficiency. So for Axial control It is especially important to analyze and solve the influencing factors of valve failure during use.
1, Axial control valve stuck
The problems that are often encountered in valve adjustment during jamming often result in system software that is put into operation when new funds are put into operation and re-use during maintenance. It is caused by the internal welding of the pipeline, the residue such as the iron pin and the accumulation of the residue at the throttle valve port and the guiding position.
After the jam occurs, the circulation of the material goods is blocked or the filling valve is too tight in the maintenance, and the friction is increased, resulting in a situation where the small data signal is not in a posture and the big data signal is excessively placed.
2, Axial control valve leaked
Axial control valve leaks typically include leaks from internal leaks, packing leaks, and deformation of the valve plug and seat.
(1) The valve leaks because of the problem of the length of the valve stem. The length of the valve stem of the gas-opening valve is too long, so that the spacing of the valve stem upwards or downwards is too short, resulting in a gap between the valve core and the high-pressure gate valve. There is no thorough touch, which leads to leakage inside the valve.
(2) The packing leaks and the packing is loaded into the stuffing box to apply axial pressure to the regulating valve. Due to the plastic deformation of the filler, radial pressure is generated, which is in close contact with the valve stem, but the contact is uneven.
During the operation of the regulating valve, the valve stem and the packing will move axially. In the environment of high temperature and high pressure, it is easy to cause leakage of the filler due to the influence of the high permeability fluid medium.
(3) The valve core and high-pressure gate valve are deformed and leaked, corrosion and impact, causing deformation, and the change of time will cause the valve core and the high-pressure gate valve to be mismatched. There is a gap between them, which causes the clearance. It does not matter tightly.
3, Axial control valve oscillation
Axial control The reason for the valve oscillation is that the spring stiffness of the regulating valve is insufficient, the output signal of the regulating valve is unstable, and the frequency is sharply changed, the frequency of the regulating valve is the same as the frequency of the system, and the pipe and the base are vibrated violently.
And Axial control Improper valve selection, when the regulating valve is operated at a small opening degree, it produces severe flow resistance, flow rate and pressure changes. When the change exceeds the stiffness of the regulating valve, the stability of the regulating valve is lowered, and in severe cases, The regulating valve oscillates.
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