2.3 Installation of valve into pipeline
Valve must be installed into pipeline so that flow of medium is according to arrows on the body. The
actuator can be installed in any position except the position below the valve body. Keep the rules in
instalation and maintenance instructions of actuator too. Protection of actuator against the radiant heat can
be necessary in case of high temperature application. As a basic provision can be made pipeline insulation,
actuator turning aside from vertical position, etc..
For proper function of control valve, below-mentioned instructions must be obeyed :
- no excessive forces can be transfered from pipeline to valve.
- the pipeline must be cleaned from dirt before valve installation.
- the valve can not be installed just behind the bend. Pipeline should be straight min. 6xDN in front of the
valve.
- it is recommended to keep clean space around the valve for easy manipulation and service.
- installation itself must be done precisely. Pipeline flanges must be coaxial with valve flanges.
- it is necessary to use connectioned pipe union for valves with threaded connection during its installation so
that the dismantling of valve from the pipeline will be possible and can be carried out.
2.3.1 Electric actuator or electrohydraulic actuator connection
These work may be carried out by trained personnel only. It is necessary to keep all safety rules relating to
electric machines. Further it is necessary to follow instructions for installation, operation and maintenance of
electric actuators issued by the producer. Position transmitter and signalisation switches, if part of delivery, are
positioned under the actuator cover.
Before valve commissioning, the data, given in the actuator ID plate (especially supply voltage and voltage of
control signal), should be checked/compared with given specification and verify, that the actuator can be
connected to superordinate regulator.
Switching off by torque or power switch is adjusted in upper position for the valves that are equipped only with
the seat in straight way. In position when the straight way is open, the switching the actuator off is adjusted by
limit switch or torque switch with the use of the stop.
In case the actuator is dismantled from the valve body for any reason such as the valve installation into pipeline
etc., it is necessary to check the setting again after the assembly possibly to carry out the complete setting of
actuator again. Producer does not take over the guarantee if the damage was caused by improper setting or
adjusting of the actuator. In case of need, it is possible to ask for such service from service organization of the
producer.
The length of the actuator´s cables shall be selected so that the actuator can be removed from the valve without
disconnection from the terminal board.
2.3.2 Checking after installation
Piping system should be pressured after valve installation and the checked if there is not leak. Check the
packing set tightness as well. Then check the proper function of actuator by doing a few strokes.
2.4 Operating and Maintenance
2.4.1 Packing set
The packing set does not need a lot of servicing in the case that the valve has PTFE or O-ring EPDM packing
set, and also in this case gland bolt may not be tightened nor loosen. If leakage is high, the packing set must be
changed.
2.4.2 Exchange of packing set
If there is need to exchange the packing set because of high leakage, first the actuator must be dismantled and
then the packing screw must be screwed out. The pipeline may not be under pressure during changing of
packing set. After this, there is need to check the state of spindle surface and clean the inside of the packing
box. The surface of spindle must be smooth and not damaged. If necessary, the spindle must be exchanged.
Packing set is filled, by the producer, with a special lubricant acc. to the type of used packing. Such lubricant
ensures the proper function of the packing rings within their service life. The spindle may not be greased
during the operation!
After exchange of packing set, the gland bolt must be tightened to the bottom of packing box.After installation of
actuator, there is necessary to make test as in 2.3.2.
2.4.3 Exchange of plug
When the valve is used for medium with high dirt-content is probability that packing surface of plug will be wear
out and internal leakage of valve will be too high (seat - plug leakage). In this case the professional service must
be called.
Regarding the fact the valve is delivered with its actuator as a complet, the basic adjusting is carried out.
PM - 009/12/01/GB _ RV 102, 103 3/6
