13
3. Operation
Problem
Cause/result
Repair
The valve does not maintain
- Faulty diaphragm
- Replace the diaphragm
the preset pressure
- Guide (9) seizes
- Lubricate the guide (see section 3.1)
- Incorrect operating range
- Check the pressure drop over the
valve and check the flow rate (see
section 5.2)
- The available air pressure is
- Increase the air pressure eg. by using
lower than the product pressure
a Booster (see section 2.4).
- The air pressure is not correctly
- Readjust the air pressure
adjusted
- Faulty air pressure regulating
- Repair the valve or check that it is
valve or incorrect type
pressure compensating
Product leakage
- Worn diaphragm
Replace the diaphragm
- Product affected diaphragm
Air leakage
- Worn O-ring
- Replace the O-ring
- Worn diaphragm (10)
- Replace the diaphragm
- Worn and hard diaphragm (10)
- Replace by a diaphragm of a different
grade for higher temperature (see
section 5.1)
Valve plug moving too fast
Pressure pulsations because of
Use an air throttling valve (optional extra
up and down (unstable)
fast changes in process conditions
between the air pressure regulating
valve and the CPM-2 valve.
Pay attention to possible break-down.
Study the instructions carefully.
The items refer to the parts list and service kits section.
3.2 Fault finding
NOTE!
Study the maintenance instructions carefully before replacing worn parts - see section 4.1
