What are the common faults of pneumatic diaphragm regulating valves? (One)
Common faults of pneumatic diaphragm regulating valves are as follows: gas source system failure, power system failure, electrical converter failure, valve positioner failure, valve body failure, improper PID parameter setting in the control valve control system, and the process status is not Stable. This paper first analyzes the air supply system failure, power system failure, and electrical converter failure. First, the pneumatic membrane regulating valve air source system failure Second, the pneumatic membrane regulating valve power system failure Third, the pneumatic membrane regulating valve electrical converter failure 1, zero, the range is not allowed. The zero point and the range of the converter output signal are not accurate due to the inaccurate installation or commissioning or on-site vibration and temperature changes. As a result, the regulating valve can not be fully opened and closed, the leakage amount is large, and the limit is limited. In the on-site tuning of the converter, first ensure that the converter signal small table indication is accurate. The signal small table should be maintained in general. Zhejiang Chengrui Valve Co., Ltd. specializes in the production of self-operated regulating valves , pneumatic regulating valves, electric regulating valves, pneumatic shut-off valves and other regulating valve products. The main products are self-operated regulating valves and pneumatic diaphragm regulating valves. This article comes from: http:// ABS Blade Ceiling Fan Without Light Small Ceiling Fans Without Lights,Low Profile Ceiling Fan Without Light,Contemporary Ceiling Fans Without Lights,Flush Mount Ceiling Fan No Light JIANGMEN ESCLIGHTING TECHNOLOGY LIMITED , https://www.jmwindfansummer.com
1. The instrument wind line is blocked. Since the ball valve has a throttling effect at the end of the instrument branch wind line, the dirt in the wind line is easy to accumulate and block here. As a result, the instrument wind pressure is too low, the regulating valve cannot be fully opened and closed, and even the regulating valve does not operate.
2. The air filter pressure reducing valve is faulty. The air filter pressure reducing valve uses too much waste for a long time, the pressure reducing valve leaks air, and the pressure reducing valve sets the output pressure to the bottom, so that the output instrument wind pressure is less than the specified pressure. As a result, the regulating valve is slow to operate, and it cannot be fully opened or even closed.
3. The copper tube connection is faulty. The copper tube is aging and leaking, the joint connection is loose or the material is blocked. The wind pressure of the instrument signal is low, so that the regulating valve does not operate, and the valve cannot be fully opened. The manual valve position is unstable and the adjustment oscillation is generated.
4. The instrument wind system is faulty. The air compressor station is abnormal, the device purifies the wind tank abnormally, the water cuts are not timely, the wind line is frozen, the instrument wind line is leaking or blocked by the stolen goods, causing the instrument instrument wind pressure to be too low or even windless.
5. The instrument wind branch line valve is not open, causing the regulating valve not to operate. Often occurs during overhaul of the unit and during driving.
1. The power cable terminal is loose, short circuited, disconnected, and the polarity is reversed. Due to on-site vibration, the wiring is not strong, the wiring is loose or the dust is too much, resulting in poor contact, so that the signal from the control room to the scene is sometimes absent, causing the regulating valve to operate in disorder and causing the adjustment oscillation. Due to wiring errors, the power supply line is short-circuited due to water ingress or dampness, so that the signal received by the pneumatic diaphragm regulating valve is lower than the signal of the regulator, and the regulating valve cannot be fully opened and closed. The dropout and polarity reverse adjustment valves do not operate. Polarity abnormalities occur when installing new watches, rewiring, and overhauling devices.
2. The middle connector of the power cord or the middle of the injury is faulty. The power cord is loosened or disconnected by the vibration of the environment, the pulling of external force, the insulation performance of the insulating tape, and the high temperature baking of the joint water. The power cable is short-circuited or short-circuited to the ground, and the wiring head or The power cord is broken. As a result, the regulating valve does not move continuously, and cannot be fully opened and closed. During the maintenance process, the middle of the power cord is reversed, causing the regulating valve to not operate.
3. The regulating valve is not controlled by the regulator. In the overhaul of the device, the power line is connected incorrectly during the driving process or the control room configuration is wrong, and the regulating valve is not controlled by the regulator.
2. The orifice is blocked. The instrument wind smashes the throttle hole. Causes the regulator to not act.
3. The output is not linear. Due to the aging of the coils and components in the converter or the influence of the on-site vibration and ambient temperature, the output of the converter is not linear, so that the required value cannot be achieved during the zero-point and span adjustment, and the regulating valve does not operate linearly. Fully open and closed.