Lift Indicator; Operating Pressure And Pressure Loss; Ambient Conditions; Protective Coating - Leser 330 Instructions De Service

Design and function of Change-over Valves

Lift indicator

4.6 Lift indicator
EN
Certain Change-over Valves feature lift indicators that monitor the switching
position of the Change-over Valve. The lift indicator is installed in the traverse
of the actuator assembly.
Ensure that the lift indicator is not screwed too far into the device, so that it
does not block the spindle and/or the position indicator.
Lift indicators
4.7

Operating pressure and pressure loss

The Change-over Valve must have correct dimensions so as not to interfere
with the function of the safety valves. For this purpose, the inlet pressure loss
and the back pressure must be taken into account when designing and select-
ing the dimensions of the system.
4.8

Ambient conditions

The Change-over Valves and pipelines must be protected from atmospheric
influences. Do not insulate the actuator assembly.
For extreme conditions, LESER recommends installing Change-over Valves
made in stainless steel.
4.9

Protective coating

Change-over Valves are given a protective coating at the factory. This coating
protects the Change-over Valve during storage and transport. If the ambient
conditions are corrosive, additional corrosion protection is necessary.
Moving and functionally-important parts must not be given a protective coating.
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