Keystone Manual: Butterfly Valves Series Sure-Seal IOM, Keystone-EN Manuals & Guides

KEYSTONE WINN SURE-SEAL RUBBER LINED BUTTERFLY VALVES

OperatiOn, installatiOn and Maintenance instructiOns

Before installation these instructions must be fully read and understood

2 INSTALLATION

2.1 Wafer design

This valve is of the wafer design intended for
‘sandwiching’ between two pipe flanges by
means of through bolting and is supplied with
locating holes or lugs to ensure that the valve
blade is positioned centrally in the pipeline
anddoes not foul the pipe when opened.

It should be noted that the valve can be
positioned either with the valve spindle

GENERAL

sittingvertically or horizontally.

The Winn Sure-Seal is a new generation of
high quality butterfly valves which incorporate
a bonded resilient liner and give additional
benefits of easy replacement and a wide
choiceof materials.

1 STORAGE

1.1 Storage conditions

Environmental conditions may be particular
harmful to vulcanized rubbers, therefore
the careful choice of storage conditions
isimportant.

1.2 Temperature

The storage temperature should be between
10°C and 25°C.

1.3 Humidity

Moist conditions should be avoided; storage
conditions should be such that condensation
does not occur.

1.4 Light

The valve shall be protected from light, in
particular direct sunlight and strong artificial
light with a high ultra-violet content.

1.5 Ozone

Since ozone is particularly harmful to
vulcanized rubber, storage rooms should
not contain any equipment that is capable
of generating ozone, such as mercury vapor
lamps, high voltage equipment, electric motors
or other equipment which may give rise to
electric sparks or silent electrical discharges.

As the valve liner extends over the flange
faces this forms a ‘built in’ gasket between the
mating flanges, therefore no flange joints are
required when using these valves. To ensure
a perfect flange seal, the mating flange faces
should be bolted up until there is a metal
contact between the flange faces and the valve
body. Care should be taken to ensure that no
sharp edges or burrs are left on the flange
faceas this may damage the liner.

2.2 Lug design

The foregoing applies when the valve is fitted
in a ‘line end’ situation, spigots on both the
body bore and seat outside diameter restrict
axial movement of the seat. The valve must be
fitted with spigots to the open end, see Fig. 1.
The spigotted end can be easily be identified
by measuring the radial width of the outer
rubber seal, the spigotted end seal being
(1.5mm)narrower.

2.3 Manual operators

Valves fitted with manual operators have
handlevers or handwheels sized to ensure
ease of operation, and under no circumstances
should wheel spanners or additional leverage
be applied to open or close the valve. All geared
operators are fitted with built in stops and these
are set in our works before dispatch.
These settings should not be altered.
Where valves are supplied without handwheels,
reference should be made to appropriate
contract drawing for recommended operator
input torques.

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VCIOM-02487-EN 15/02

KEYSTONE WINN SURE-SEAL RUBBER LINED BUTTERFLY VALVES

OperatiOn, installatiOn and Maintenance instructiOns

3 MAINTENANCE

No maintenance is required other that periodic
inspection to ensure satisfactory operation and
satisfactory sealing of the valve spindle.

If the valve is fitted with an enclosed geared
operator, it is recommended that at least
once every year, if possible, the gearbox
cover can beremoved and grease added
if necessary (forappropriate grease see
gearboxnameplate).

4 DISMANTLING

The valve should be suitably supported
and then removed from the pipeline after
withdrawal of the flange bolts. Remove the
operator by releasing the necessary bolts and
lift directly off the valve any mounting plates
orbrackets, if fitted, being removed next.

WARNING

Before attempting any maintenance, ensure
that the system has been depressurized and if
necessary, drained of all dangerous chemicals.

4.1 Wafer design

To dismantle the valve, the plastic plug (12) in
the tail end should be removed making the tie
bar visible. The nut (8) should be removed and
discarded.
With the valve in the part open position the
upper shaft (5) should be removed either
by pulling the shaft from the drive end, or
by pushing the bar (7) from the tail end, of
thevalve.
The lower shaft (6) can now be removed using
a piece of bar pushed through the disc from
thedrive end.
Having removed the lower-shaft, this disc (4)
can be removed from the seat using a soft
hammer.
The liner (2) can now be removed from the
body (1) by simply slicing or knocking it
axiallythrough the body bore.
The wiper seal (10) can be prized from its
location using a sharp instrument or wire.

4.2 Lug design

The foregoing applies with the exception the
liner can only be removed from the body in
onedirection - see Fig. 1.

10

1

9

6

8

Item Component

1 Body
2 Liner
3 Backing ring
4 Disc
5 Shaft (upper)
6 Shaft (lower)
7 Shaft tie bar
8 Tie bar nut
9 Shaft bearing
10 Wiper ring
11 Ring retainer
12 Body plug

5

7

11

9

3

2

4

12

NOTE

DN 350 and above have single piece shaft and
pindesign.

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