KSB SICCA GLS Series, Operating Instructions Manual

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SICCA
13
Refer Page No. 9 “Important Note”
7 Commissioning / Decommissioning
7.1 Commissioning
7.1.1 General
Prior to commissioning the valve, the pressure, temperature and
material data stated on the valve should be compared to the
actual operating conditions in the piping system to check whether
the valve can withstand the loads occurring in the system.
Possible pressure surges (water hammer) must not be exceed
the highest admissible pressure. Adequate precautions should
be taken.
In new pipe systems and especially after repair work, the system
should be flushed with the valves fully open to remove solids,
e.g. weld beads, which may damage the seats.
Large size check valves >12” in low flow, low
pressure and fluctuating flow conditions may
cause chattering of disc with seat. KSB recommends use of
appropriate means of balancing of disc.
7.1.2 Operation
The valves are closed by turning the handwheel in the clockwise
direction (top view) and opened in the counterclockwise
direction.
Using additional levers when turning the handwheel is not
admissible, because excess force may damage the valve
7.1.3 Functional Check
The following functions should be checked:
Before commissioning, the shut-off-function of the valves should
be checked by repeated opening and closing.
The gland packing (461) should be checked when it is subjected
to the full operating pressure and temperature for the first time.
If necessary, retighten the nuts (920.2) at the gland flange
(452) evenly.
On valves in pressure seal design, the nuts (920.1) of stud
(902.1) which hold the bonnet (139) and the gaskets (411)
under tension must be tightened so as to prevent leakage,
due to the bonnet (139) sinking in to the body (100) when the
pressure drops.
The cover flange connection (902.1/920.1) and the gasket
(411) should be checked for tightness after the first temperature
rise at the valves. In case of leakage at the gasket (411), the
connection should be tightened crosswise, evenly and in a
clockwise direction.
Open the gate and globe valve by one or two turns of the
handwheel prior to retightening the nuts 920.1 to prevent
jamming of the seat.
Retightening of the nuts (920.1) of the cover bolting especially
applies to valves used in heat transfer systems to DIN 4754.
7.1.4 Actuated valves
On valves with electric/pneumatic/hydraulic actuator, the
strokes/forces must be limited.
Electric actuators should be wired as follows:
Always use suitable spare parts and tools, even in emergencies,
because otherwise correct operation of the valves can not be
assured.
ATTENTION Valve type Open Close
GTC - #150 - 600 Limit Torque
1)
GTC - # 900 - 3600 Limit Limit 2)
GLC - # 150 - 2500 Limit Torque
GTF/GLF - # 1500/2500/4500 Limit Torque
1) Motor trips by torque switch followed by limit switch
2) Motor trips by limit switch followed by torque switch
Switches are factory set. Do not tamper with
settings. To readjust settings refer instruction
manual of actuator manufacturer and / or contact your nearest
KSB office.
For setting of actuator, please refer instruction manual which
will be kept in the wiring side compartment/cover of actuator.
During setting ensure torque setting for open position must be
10% more than closed position.
7.2 Decommissioning
During extended shutdowns periods, liquids liable to
change their condition due to polymerization, crystallization,
solidification etc. must be drained from the piping system. If
necessary, the piping system should be flushed with the valves
fully open.
8 Maintenance/Repair
8.1 Safety Instructions
Maintenance and repair work may only be carried out by skilled
and qualified personnel.
For all maintenance and repair work, the safety instructions
listed below and also the general notes in section 3 must be
observed.
Always use suitable spare parts and tools, even in emergencies,
because otherwise correct operation of the valves can not be
assured.
8.1.1 Dismantling of valves
Before removing the complete valve from the pipe, or before
repair or maintenance work on the valve itself, i.e.
- before removing cover/yoke or pressure seal bonnet from
the body
- before removing/unscrewing vent or drain plugs
- before removing the gland cover to replace packing rings
- before removing an actuator bolted directly to the yoke head
The entire valve must be unpressurized and must
have cooled down sufficiently so that the temperature
of the medium in all the valve’s chambers is lower
than the vaporization point of the medium, to prevent
scalding.
Opening pressurized valves will cause danger to life
and limb!
If toxic or highly inflammable substances or liquids whose
residues may cause corrosion by interaction with the air
humidity were handled by the valve, then the valve should be
drained and flushed or vented.
If necessary, wear safety clothing and a face guard/mask.
Depending on the installation position, any liquid remaining in
the valve may have to be removed.
ATTENTION
ATTENTION