10
5.Operating problems. Causes and solutions
ED. 2010/11
5.
Operating problems. Causes and
solutions
PROBLEM
CAUSE/EFFECT
SOLUTION
VALVE DOES NOT
CLOSE
Dirt / foreign matter between the seal of the shaft and the
seat of the valve body.
The springs are not applying pressure to the stop washer
of the shaft
The check valve seal is worn and defective.
Clean the body and seat.
Increase the tightening torque of
the springs.
Replace the seals.
INTERNAL LEAK OF
THE PRODUCT
(VALVE CLOSED)
Premature wearing of the seals.
Replace the seals.
Premature
wearing of
the seals.
Watertight seal worn or affected by the
product.
Excessive pressure in the line.
Working temperature too high
Loss of watertightness (vibration).
Replace the seals with others of
different material and more
appropriate to the product.
Tighten any loose components.
Clean frequently.
Backpressure
Replace the spring with a stronger
one.
EXTERNAL LEAK OF
THE PRODUCT
Seal of the body defective
Seal of the shaft defective
Replace the seals with new ones
VALVE DOES NOT
OPEN/CLOSE
Deformation of seat seal.
Spring in poor condition and/or jammed (dirtiness)
The valve does not close when the pressure increases.
Replace the seal seat with other of
different quality, if prematurely
deteriorated.
Replace spring and/or shaft
(clean).
Adjust the valve
Recalibrate the valve. See point
4.4 Valve calibration.
