Festo VZWM, Operating Instructions Manual

Page: 21 / 88

VZWM
Festo VZWM 0612NH English
21
6 Fittin g
Using incompressible media (neutral water)
S
Avoid excessive pressure shocks which may occur when the valve is switched.
Otherwise the diaphragm valve or a connected measuring device may be
damaged.
S
Compare the pressure shock which occurs with the maximum permitted
bursting pressure of the subsequent valves and fittings.
V a l u e o f the pre ssu re s ho c k Re m e d y
Pressure shock < Bursting pressure of
all subsequent
valves and fittings
S
Fit the valve.
Pressure shock > Bursting pressure of
all subsequent
valves and fittings
S
Optimize the application parameters
in order to avoid pressure shocks.
S
Use one of the nomograms in
chapter 13 for defining the pressure
shock (
è Fig.10).
Fig.4
S
Make sure that the tubing system in which you wish to install the diaphragm
valve is pressureless or that no liquid medium flows through it.
S
When fitting the VZWM diaphragm valve check the direction of flow in the
device. The permitted direction of flow is marked by an arrow on the valve
housing.
S
Note the sequence of fitting steps with regard to the tubing already fitted.
S
Use a support bracket ( è Accessories") for fastening the VZWM diaphragm
valve. The mechanical stability of the tubing system will then be increased.
S
Make sure that there is sufficient space for connecting the VZWM diaphragm
valve.
S
Make sure that there is sufficient space for the screw connectors.
S
Note that the output of the diaphragm valve must be connected for operation.
S
Before ftting wash out the tubing at intervals.
S
Avoid dirt. In this way you will prevent small holes from becoming blocked
(e.g. pilot or exhaust hole) and restriction or blockage of the function (open/close).