Vag ZETA Operating And Maintenance Instructions Manual Download

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VAG Operating and Maintenance Instructions • 7

5 Putting the valve into operation

5.1 Visual check of the valve

Before putting the valve and the electric multiturn actuator into

operation, make a visual inspection of the functional parts. Tho-

roughly clean all parts essential for proper function (such as the

stem, bearing, seals, knife etc.) to remove all dirt.

VAG does not assume any liability for consequential damage

caused by dirt, residue of shot blasting particles or welding

beads on the knife. The valves are thoroughly lubricated at the

factory to ensure trouble-free transport, storage and installation.

However, it might be necessary to lubricate them again when ta-

king them into operation.
Recommended lubricants:
• Knife and seals: Fuchs Chemplex Si 2; Fuchs Notropeen Si 1;

Klüber Unisilikon L 641

• Stem and stem nut: KLÜBERPLEX BE 31-502 for electric

drives Manufacturer: Klüber Lubrication München AG, Germany

Connection to the electrical mains!

Work on electrical devices or equipment must only be per-
formed by skilled persons or specially trained staff under
supervision and in compliance with the electro-technical
rules. Connection to the electrical mains must be perfor-
med in compliance with the operation manual and the cir-
cuit diagram and terminal diagram of the manufacturer of
the electric actuator.
The regulations and directives for operation in potentially
explosive atmospheres must be observed.
After installing the valve, make sure it is properly grounded,
e.g. via the flange connection.
After assembling the multiturn actuator, immediately con-
nect it to the mains so that its heating can prevent the
formation of condensation water!

5.2 Putting the electrical multiturn actuator

into operation

5.2.1 Using the handwheel, first turn the knife of the ZETA

Knife

Gate Valve manually into central position.
5.2.2 Then shortly operate the electrical multiturn actuator to

check the direction of movement of the knife and thus the correct

direction of rotation of the actuator.
Correct: Actuator turns RIGHT (clockwise) = Valve closes
Correct: Actuator turns LEFT (counter-clockwise) = Valve opens

5.2.3 When the direction of rotation is wrong, the polarity of the

connection cables must be reversed.

Warning!!! If the electrical connections are wrongly pola-

rised, the limit switches and torque switch will not work!

5.2.4 The electric actuator can only operate the valve over its ent-

ire length of stroke when the direction of rotation and the polari-

sation are correct.
5.2.5 Operate the valve over its entire length of stroke to check

for smooth movement and the correct final positions „OPEN“ and

„CLOSE“.

5.3 Emergency manual operation via the

handwheel

The diameter of the handwheel for emergency operation is fac-

tory-defined and designed for normal manual forces only.
When the valve is operated via the handwheel of the electric mul-

titurn actuator, it must be taken into account that there is no pro-

tection of the operating mechanism in case the failure moments

are exceeded.
Careful and meticulous operation of the handwheel is therefore

necessary.
The assembly and use of lever extensions (e.g. handwheel rods)
is impermissible.
Should you detect a noticeable resistance when closing the valve
via the handwheel, do not exert higher manual force but turn the
handwheel back into the opposite direction by some turns and
then try to operate the valve again.
If the handwheel keeps blocking, the pipeline should be checked
for obstructions.

5.4 Function check

Before putting the valve into operation, open and close it at least
once over its entire stroke and check for easy movement.
If the pipeline has to undergo a pressure test with water, the maxi-
mum permissible operating pressure (see Table 3) of the valve
must not be exceeded when the knife is open.

The pressure exerted on the closed valve must not exceed the
maximum permissible operating pressure (see Table 3).

The lateral seal of the valve has been factory-adjusted to the
maximum permissible operating pressure / nominal pressure PN
(see Table 3) in the body. For pressure tests with higher pressures
(up to the maximum test pressure for resistance in the body
according to Table 3) the tension of the lateral seal can be increa-
sed on site by turning the screws of the cover clockwise.

max. admissible

Admissible operating temperature

Test pressure in

operating

for water, waste water and sewage bar with water

overpressure PS

sludge

Resistance

Leak-freeness

bar

°C

in body