Diaphragm Pressure Keeping Valve
Operating Instructions
12
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Technical modifications reserved!
TA 49
Rev.
13 en
05/2016
11
Adjustment
Check the set pressure by means of e.g. a pipe test pump. If
the set pressure does not match the indication on the type
plate, remove lid and correct pressure using the set screw.
•
Turning counterclockwise: the set pressure reduces
•
Turning clockwise: the set pressure increases
Pipe test pump
Diaphragm
pressure keep
ing valve
Fig.11 Check
CAUTION !
The operator is obliged to document these checks.
CAUTION !
Never screw in the set screw to a depth so that the
spring(s) is (are) compressed to solid length!
CAUTION !
sera diaphragm pressure keeping valves are factory-set to
the set pressure stated in the order confirmation. A seal-
ing wax seal is located on the transition piece between lid
and cover.
12
Operation in explosion-hazardous areas
As there are no ignition sources the pressure keeping valves
can be used unproblematically in the hazardous area (ATEX)
acc. to 2014/34/EU.
The pressure keeping valves have to be integrated into the
equipotential bonding by customer.
13
Spare- and wearing parts
Depending on their use and period of use, wearing parts must
be replaced at regular intervals in order to ensure a safe func-
tion of the diaphragm pressure keeping valve.
The diaphragm should be replaced:
Every 3000 hours, at least yearly.
In case of a premature diaphragm rupture caused by hard op-
erating conditions, switch off the diaphragm pressure keeping
valve and replace the diaphragm (see Chapter 14).
