14
6. Operating problems
(0) 2018/05
6.
Operating problems
Water hammer
Valve does not open/close
Internal leak of product (valve closed)
The valve plug is sticking
PROBABLE CAUSES
SOLUTIONS
• The seal or guide bushing is worn, deteriorated
or has gotten stuck
Replace the seals
Replace the seals with ones made of a different
material or grade that is more appropriate for
the product
Lubricate with soapy water or a lubricant that is
compatible with the seal material and the
product
• Insufficient air pressure
Replace the actuator with a larger one
Increase the compressed air pressure
•
Normal wear of seals
Replace the seals
•
Premature wear of the seal / affected by the
product
Replace the seals with ones made of a different
material or grade that is more appropriate for
the product
Reduce the pressure in the line
Reduce the working temperature
•
Product residue has been deposited on the valve
seat and/or plug
Clean frequently
•
Excess product pressure
Replace the actuator with a larger one
Connect an auxiliary compressed air nipple on
the side of the spring (to offset the excess
pressure) without exceeding (4 bar)
Reduce the product pressure
•
Loss of seal (vibrations)
Tighten loose parts
•
Product pressure exceeds the actuator
specifications
Replace the actuator with a larger one
Reduce the product pressure
Use auxiliary air on the spring side
•
Warping of seals
Replace the seals with ones of a different
quality, if they have deteriorated prematurely
•
Actuator spring in poor condition and/or stuck
(dirty)
Replace spring (clean)
•
The direction of flow is the same as the direction
of closing
The direction of flow should go against the
direction of closing
Choke the air discharge to reduce the pressure
