Common failure causes and measures of intelligent valve positioner

Release time:

2024-01-02 09:00

Fault 1: The output speed of the positioner is slow

reason:

1, the input air chamber leaks

2, the constant orifice is blocked

3, the air supply pipeline leaks

4, the baffle is scratched or poorly positioned

 

Take measures:

1. Replace the damaged diaphragm

2, cleaning the orifice

3. Detect leaks and deal with them

4, replace the baffle or readjust

 

Fault 2: The positioner has no output pressure (the baffle does not move after the input signal)

reason:

1、Positive and negative wiring error

2, air source five pressure

3, the magnetoelectric component coil is broken

 

Take measures:

1, re-wiring

2, input the specified air source pressure

3. Connect the broken wire of the coil

 

Fault 3: The positioner has no output pressure (the input signal baffle has action)

reason:

1. The gap of the nozzle baffle is too large

2, the surface of the baffle is scratched

3. Improper adjustment of the zero position

4, the amplifier gas path is blocked

5, the nozzle orifice is blocked

6, the zero spring is too soft

 

Take measures:

1. Loosen the fastening screw, adjust the nozzle baffle gap when the maximum signal is input, so that the pressure gauge value reaches 0.1~0.11Mpa, after fastening the screw, perform a negative inspection

2, replace the baffle

3. Input the minimum signal, turn the zero adjustment screw to move the carriage to the left, and tighten the zero adjustment spring until the actuator starts to move

4. Check the gas path

5, A: Use fine steel wire for dredging, B: Replace the filter element of the air filter pressure reducing valve

6. Replace the zero spring

 

Fault 4: The output pressure of the positioner does not decrease after the input current signal changes

reason:

1. The installation position is not suitable, so that the gap between the nozzle and the baffle is too small

2. There is dirt on the nozzle end surface or the contact part of the baffle and the nozzle, which reduces the actual gap

3. After adjustment, the screw on the nozzle base is not tightened, so that the gap changes

4, the constant air flow hole parts fall off, causing the orifice to become larger

 

Take measures:

1. Re-adjust the gap between the nozzle and the baffle

2, remove the dirt on the nozzle end surface or the contact part of the baffle and the nozzle

3, tighten the screws on the nozzle base

4. Check the constant orifice and reinstall the missing parts

 

Fault 5: Zero position misalignment

reason:

1. The zero adjustment screw is loose

2, the diaphragm of the input air chamber leaks

3, the fastener is loose after the stroke adjustment

4, the cam is loose

 

Take measures

1. Tighten the zero adjustment screw and readjust the zero point

2, tighten the amplifier screws, and replace the damaged diaphragm

3, re-tighten the stroke adjustment piece

4, tighten the cam

 

Fault 6: Dislocation of positioning output

reason:

1, the input air chamber leaks

2, the cam is loose

3, the main lever fulcrum plate, spring plate screws are loose

 

Take measures:

1. Replace the damaged parts or tighten the leaked parts

2, re-tighten the cam

3. Re-tighten the screws