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Piston valves
Piston valves are used for various media as shut-off valves or as control
valves with an on/off function. Such valves are normally maintenance-
free, and so any maintenance or replacement is determined by long-term
wear or by seal damage.
• Wear and tear can give rise to leakage in the actuator seal, the sleeve
seals of the stainless steel pipe or in the valve body stem seal.
If the valve is otherwise in good condition, such leakage can be cured
by a renovation set.
• Wear and tear in the valve actuator will give rise to leakage of
compressed air to the surroundings. Leakage into the valve body and
its media is prevented by a vent hole in the stainless steel guide tube.
• Wear and tear of the stainless steel pipe sleeve couplings can give
rise to leakage between that part of the valve body that is connected
to the top of the valve stem and the vent hole in the stainless steel
pipe sleeve.
Depending on how the valve is connected, such leakage can be
detected by means of a leak test of the sterilizer or by leakage of
media through the hole.
• Damage to, or dirt on, the valve body stem seal can cause leakage
between the inlet and outlet sides of the valve. If the valve is
A = White B = Red C = Blue D = Yellow
Always replace seals, including any face seals in
connections when dismantling the valves.
A
B
C
D
A
B
1
2
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