Mechanical Problems
Problem |
Possible Error |
Solution |
Feedback position and actual position are not the same |
Actuator and valve are mounted 90°rotated in relation to each other |
Remove actuator from valve. Check assembly code of actuator. Put both valve and actuator in “Closed” position. Mount actuator on valve |
Valve is in “Closed” position, actuator is in “Open” position and will not move anymore |
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Valve does not reach the completely “Closed” or “Open” position |
Limit stop screws are not set correctly |
Readjust the limit stop screws |
Insert is not mounted properly |
Mount the insert in the right position.
Remark: Rotate insert to one cam = 22.5° |
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Pressure too low |
Apply pressure as per sizing |
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Sizing is wrong |
Check valve torque data with actuator torque data |
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Pinion is mounted in the wrong position |
Reassemble actuator |
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Actuator rotates, valve does not |
No coupling between actuator shaft and valve spindle |
Install a coupling between actuator shaft and valve spindle |
Pneumatic Problems
Problem |
Possible Error |
Solution |
Actuator does not react to electrical control signal |
There is no supply pressure at the actuator |
Supply the right pressure to the actuator |
Actuator does not react good to electrical control signal |
There is sufficient supply air pressure but insufficient supply air capacity |
Take care the supply air tubing has the right dimensions |
Supply pressure too low, causing pilot operated solenoid valve to fail |
Check that supply pressure at the actuator and solenoid is sufficient to operate the actuator |
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Solenoid valve is not mounted properly |
Check the solenoid valve mounting |
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Speed control throttle (if present) blocks air flow |
Turn the speed control more open |
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Manual override (if present) on the Solenoid Valve is locked |
Unlock manual override on the solenoid valve |
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Air leakage between actuator and solenoid valve |
Sealing between solenoid valve and actuator is not mounted air tight |
Reassemble solenoid valve taking care, that all seals are in place |
Double-acting actuator will only move to “open” position |
Actuator has wrong Solenoid valve configuration |
Mount a solenoid valve suitable for doubleacting Actuators (4/2 or 5/2 function) |
Check that conversion plate on solenoids, that have both 3/2 and 5/2 functions, is in the right position |
Electrical Problems
Problem |
Possible Error |
Solution |
Actuator does not react to control signals |
Control wiring. Power supply wiring or feedback wiring are not right connected |
Connect all wiring in the right way |
The power supply voltage is not is not the same as the voltage of the applicable solenoid valve |
Connect the right power supply voltage |
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There are problems with position feedback after sending the actuator to either the “Open” or “Closed” position |
The wiring of the feedback signals may be switched |
Connect the feedback wiring in the right way |
COVNA – Solve your technical questions with solid experience.
We are COVNA Automations, one of the top manufacturers of quarter turn actuators and automatic control valve products in Dongguan, China with 18 years experience. Our industrial experience will be useful in your business and projects.
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