Emerson HANCOCK User Manual

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HANCOCK CAST STEEL - GATE, GLOBE AND CHECK VALVES
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
PARTS LIST
No. Description
1 Body
2 Seat ring
3 Disc
4 Stem
5 Disc nut
6 Bonnet nut
7 Bonnet stud
8 Gasket
9 Backseat
10 Bonnet
11 Packing
12 Eyebolt pin
13 Gland eyebolt
14 Gland
15 Gland flange
16 Eyebolt nut
17 Stem nut
18 Hand wheel
19 Hand wheel nut
3 GLOBE VALVES
3.1 Installation and operation
3.1.1 Prior to installation
Valves not required for immediate use should
be stored under clean conditions to reduce the
risk of foreign matter entering the valve during
unpacking. If the valves are unpacked for
checking purposes, they should be immediately
re-packed until required for use.
Protection caps fitted to inlet and outlet
connections must be removed together with
any internal anti-corrosion sachets, but not
until immediately prior to installation.
3.1.2 Installation
Valves are suitable for flow in one direction only
(as indicated on the body) and must be installed
accordingly. They should be installed with the
stem in either the upright or horizontal position.
Other positions may be detrimental to the
proper seating of the disk.
The valves should be installed in positions
where minimum stress is imposed on them
from expansion and contraction of the pipe, and
pipework should be adequately supported close
to the valve to minimize mechanical pipe strain.
All valves will have been pressure tested at
ambient temperature before delivery so it is
recommended that gland packing nuts should
be tightened after a short time on higher
temperature service.
Braided end ring
Die-formed rings
(3 min.)
Braided end ring
120° Stagger of joints
45° End cut
Re-packing glands
To gain access to the packing box, the gland
adjusting nuts should be removed and the
gland and packing flange removed or retracted
along the stem as far as possible. When the
stuffing box has been completely emptied of the
original packing, it must be thoroughly cleaned
before the new packing is introduced. It is
recommended that the packing manufacturers
general instructions are followed when
repacking glands.
General
It is recommended that the reconditioned valve
should be subjected to hydrostatic testing
in-line, before being reinstated on line working
conditions.
3.3 Spares
The normal requirement for spare parts for
normal wear in service are gland packing
andgaskets.
3.1.3 Operation
Rotation of the handwheel in the clockwise
direction (see marking) will cause the valve
toclose, and vice versa.
Excessive force application other than by the
handwheel can result in failure of the thrust
assembly or damage to the valve seating.
3.2 Maintenance
Routine maintenance
While the valve is working satisfactorily,
the only requirement for routine service is
lubrication of the thrust assembly.
Valves are supplied with this assembly fully
lubricated and should operate smoothly.
To avoid problems from developing, the
assembly should be regularly lubricated on
thestem.
Recommended grade of grease is:
MobuluxEP2 (or equivalent).
Gland Leakage
CAUTION
On no account should stem gland repacking be
attempted under pressure if the contained fluid is
dangerous because of temperature, high pressure
or chemical composition.
Evenly tighten the gland adjusting nuts to
compress the packing rings.
If this does not correct the leakage or if the
adjustment is fully used up, it will be necessary
to repack the gland using a new set of the
correct grade packing, or to add packingring(s).

Emerson HANCOCK Specifications

General

Brand	Emerson
Model	HANCOCK
Category	Control Unit
Language	English