Switching Change-Over Valve - Leser 330 Instructions De Service

Operation

Switching Change-over Valve

8.2 Switching Change-over Valve
EN
Use of inadmissible tools and implements
The use of inadmissible tools and implements such as lever extensions when
switching the Change-over Valve can cause damage to the valve. There is also
a risk that the medium escapes. This can result in poisoning and caustic and
other burns.
– Turn the handwheel with both hands. Do not use any tools or implements.
– Wear safety goggles, protective gloves and protective clothing.
Risk of injury from escaping medium
There is a risk of serious injury when the medium escapes with a loud noise
under high pressure and at a high temperature.
– Wear safety goggles, protective gloves and protective clothing.
Risk of injury from escaping residual medium
Due to the design of the valve, it is not possible to fully drain all residual
medium. Escaping residual medium can cause serious injury.
– Wear safety goggles, protective gloves and protective clothing.
As no two systems are the same, the Change-over Valves must be tested
according to plant-specific regulations and best practice.
The instructions below provide a rough guideline only.
Prerequisites
– The system pressure is low enough for manual switching by means of the
– The safety valves are installed so that no medium can escape during the
– All openings on the Change-over Valve are sealed.
– If the valve is equipped with an optional locking device, this device must be
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WARNING
WARNING
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handwheel. Alternatively, install an optional pressure equalisation device
between the two elbows to facilitate switching at high pressures (see prod-
uct catalogue).
switching procedure.
fully opened.