HANCOCK CAST STEEL - GATE, GLOBE AND CHECK VALVES
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
SAFETY NOTICE
It is essential that a safe system of work
should be adopted before any maintenance
work is done on a valve. The following safety
considerations should be taken in to account
when preparing maintenance instructions.
Before removing valves from a pipework
system or dismantling a valve to carry out
maintenance, it will be necessary to open,
or partially open, the valves and to flush the
system to remove all traces of dangerous
fluidsand pressures.
It is important to recognize the danger
associated with the removal of the stem
packing gland with pressure in the pipework
system and the use of the backseat should not
be regarded as a device permitting repacking
of the stem packing gland whilst the valve
is under pressure as this is recognized as
dangerous practise.
1 GENERAL INSTALLATION INSTRUCTIONS
1.1 General
The installation procedure is a critical stage in
the life of a valve and care should be taken to
avoid damaging the valve.
Before installation these instructions must be fully read and understood
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1.2 Inspection
Before carrying out a valve installation, it is
important to determine whether the valve is in
asatisfactory condition.
The following generally applicable procedure
may be helpful in avoiding subsequent valve
problems and should be observed.
a) Carefully unpack the valve and check tags,
identification plates, direction of rotation
of handwheels etc, against bill of material,
specifications, schematics etc.
b) Make a point of noting any special warning
tags or plates attached to or accompanying
the valve, and take any appropriate action.
c) Check the valve for any marking indicating
flow direction. If the flow direction is
indicated, appropriate care should be
exercised to install the valve for proper
flowdirection.
d) As far as is practicable, inspect the valve
interior through the end ports to determine
whether it is reasonably clean, free from
foreign matter and harmful corrosion.
Remove any special packing materials,
such as blocks used to prevent disk
movement during transport and handling,
and anti-corrosion packs. Wipe clean from
preservation coatings, particularly seatings.
e) If practicable, cycle the valve through open
and close. Check guides or seat faces, etc.
f) Immediately prior to valve installation,
check the pipework to which the valve is
tobe fastened for cleanliness and freedom
from foreign materials.
Instructions for DN 50 - 600 (NPS 2 - 24)
ASMEclass 150, 300 and 600 bolted bonnet
caststeel valves.
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