Follow these instructions to replace the isolation valve for PR53SD Safe-Drive system.
Wear protective
eyewear, gloves, safety helmet, and safety shoes during installation and maintenance
work.
WARNING Follow local and state
legislation and regulations on occupational safety.
WARNING If you have a wash system
in place or are planning to install a wash system, make sure to familiarize yourself with
safety regulations related to hot steam and water. For more details, see the related wash
system user guide.
WARNING Process refractometers may
be installed in processes that have hot, cold, caustic, or otherwise hazardous liquids. When
installing or removing the refractometer from the process, use personal protective equipment
(PPE) adequate for the process medium and according to the requirements of the installation
site.
Isolation valve (Vaisala item
275267SP)
16‑mm wrench
27-mm wrench
PR53SD isolation valve spare
part
Familiarize yourself with the safety instructions of the installation site.
Make sure the process line is depressurized and empty.
Remove the protection caps from the bolts. Keep them for later use.
Remove the retractor and old isolation valve. Loosen the bolts using a 16-mm
wrench.
Remove the valve handle with a 27-mm wrench and keep it for later use.
Install the handle into the new isolation valve. Tighten to 75 Nm using a 27-mm
wrench.
Install the new isolation valve with the retractor. Align the isolation valve and
retractor with the welded connection. Make sure the isolation valve is closed as shown in
the figure. Two persons are required for the installation. It is recommended that the
valve handle is pointing upward.
CAUTION If you
are using the retrofit mounting kit, make sure the flange adapters and spacer stay in
place when installing the new isolation valve.
Cross-tighten the bolts to 27 Nm using a 16-mm wrench. Hold the equipment level while
tightening.
CAUTION Be careful not to
over-tighten. Using the ball valve will become difficult if the connections are too
tight.
Install protection caps over the nuts. This prevents incorrect usage when the
refractometer is retracted.