Table of Contents
Advertisement
Installation
Figure 5-2:
Grounding thread position
5.4 Checking the assembled valve
DANGER
Risk of bursting due to pressurised devices and components!
Butterfl y valves and pipes are pressure equipment that can burst
if handled improperly. Projecting, fl ying components, fragments
and released pressurised medium can cause injuries or even
death.
Before working on the valve:
Depressurise the concerned plant parts and butterfl y valves,
inclusive of the actuator. Also discharge the residual energy.
Empty the medium from the concerned plant parts and but-
terfl y valve.
WARNING
Danger of injury due to escaping exhaust air!
During operation, when regulating or when opening and closing
the butterfl y valve, exhaust air can escape, for example from the
actuator.
Wear eye protection when working near the actuator.
Hearing damage and deafness due to a high sound level!
During operation, medium-related noise emissions may be gen-
erated depending on the plant conditions. In addition, there may
be a short-term high sound pressure level when a pneumatic ac-
tuator or pneumatic attachment is suddenly ventilated without
noise-reducing elements. Both can damage hearing.
Wear hearing protection when working in the vicinity of the
valve.
Danger of injury due to pressurised components and escaping
medium!
Do not loosen pressurised components.
5-4
WARNING
Danger of crushing due to moving parts!
The valve contains moving parts (e.g. shaft and wedge-lock-
washer) that can lead to crushing if reaching into it.
During operation, do not reach into the bracket between the
butterfl y valve and the actuator.
Before working on the valve, interrupt and lock the pneumatic
energy and the control signal.
Do not allow the jamming of objects in the bracket to hinder
the rotation of the shaft.
In the case of a blocked shaft, contact Pfeiffer.
Danger of injury due to preloaded springs!
Butterfl y valves that are equipped with preloaded actuator
springs are under mechanical tension. The marking on the actua-
tor type plate indicates whether a spring return is available and
the fail-safe position. The marking on the type plates is described
in the instruction manuals for the actuators.
Release spring force before working on the actuator, see the
corresponding actuator documentation.
NOTE
If the actuator is delivered separately from the butterfl y valve or if
it must be disassembled, actuator assembly may be carried out
only by personnel trained by PFEIFFER.
Perform the following tests to test the function of the valve prior to
commissioning or recommissioning:
5.4.1
Pressure and leak test
NOTE
Damage to the butterfl y valve due to a sudden pressure increase
and resulting high fl ow speed must be avoided!
Observe the data on the type plate.
Damage to the butterfl y valve due to excessively high or low
tightening torques!
The butterfl y valve components must be tightened with specifi c
torques, see Chapter "15.1.1 Tightening torques".
Excessively tightened components are subject to increased wear.
Insuffi ciently tightened components can cause leakage.
Observe the specifi ed tightening torques.
The plant operator is responsible for performing the leak test and
selecting the test procedure. The leak test must comply with the
national and international standards and regulations applicable
at the installation site!
During the pressure test and leak test from the outside, the butter-
fl y valve disc must be brought into the open position.
EB 14t_EN
June 2023 edition
Subject to technical changes
Advertisement
Table of Contents
