Keystone Manual: DF Butterfly Valves Figure 631 - Storage Instructions, Keystone-EN Manuals & Guides

KEYSTONE FIGURE 631 DOUBLE FLANGED BUTTERFLY VALVE

STORAGE AND INSTALLATION INSTRUCTIONS

Storage and installation instructions for F631 double flanged resilient seated butterfly valves

INSTALLATION INSTRUCTIONS

1. Keystone valves are bi-directional and
will control flow in either direction. In
most horizontal pipe installations it is
recommended that the valve be installed
with its shaft horizontal and the lower disc
edge opening downstream, particularly
on sedimentation applications. Do not use
flange gaskets or sealing compounds.
TheKeystone seat design eliminates the
need for gaskets.

2. The valve disc position is in line with the
keyway or flats on the operator end of the
valve shaft.

3. To protect disc edges during installation,
removal or storage of valves, ensure
the disc is in the nearly closed position
(about5° open) and within the confines of
the valve body, but NOT fully closed, as seat

NOTE: Valve shown with optional feet

Safety precautions

Whenever a valve is being installed or removed
from the pipeline, ensure the line is not
pressurized and any hazardous medium is
drained away.

STORAGE

To protect disc edges during storage or
installation/removal, ensure disc remains
inside the valve body. The valve faces should
be adequately protected against damage and
coated with corrosion inhibitor, even when
stored under cover.

compression set may occur.

4. With suitable tooling, spread the flanges to
allow sufficient clearance for the valve.

5. Insert the valve between the flanges.

6. Loosely fit all the flange bolts.

7. Before fully cross tightening bolts, check
flange alignment and that the valve is
centered. Slowly open the valve fully to
ensure adequate disc clearance and seat
compression is correct (Q dimension),
particularly on cement, rubber lined or
heavy walled pipe.

8. Fully cross tighten all the flange bolts
(seeflange bolt torque values table).

9. Do not weld near the valve as this will result
in serious damage to the valve.

www.valves.emerson.com © 2017 Emerson. All rights reserved.

VCIOM-03013-EN 16/09

KEYSTONE FIGURE 631 DOUBLE FLANGED BUTTERFLY VALVE

STORAGE AND INSTALLATION INSTRUCTIONS

FLANGE AND PIPE COMPATIBILITY

Keystone valves are suitable for installation
between most international standard flange
systems of AS 2129/ASME 150 rating. Refer
valve literature sheet for standard drillings.
Weld neck flanges (flange ID approximates
valve bore) are recommended to ensure
maximum valve performance.

END OF LINE SERVICE

The F631 range of butterfly valves is suitable
for installation in a static end of line service
application, at full differential pressure without
the need for downstream flanges.
Consideration of the age of the valve, condition
of the seat and disc should be assessed before
using resilient seated butterfly valves in end of
line service.

VACUUM SERVICE

The F631 is suitable for low vacuum service,
expressed as 25 mm Hg to atmosphere.

FLOW

The F631 has a maximum fluid velocity
of5metres/second.

MAINTENANCE

Routine maintenance or lubrication are not
required.

FLANGE BOLT TORQUE VALUES (Nm)

Boltsize Minimum torque

M16 x 2.0 41
M20 x 2.5 81
M22 x 2.5 110
M24 x 3.0 139
M27 x 3.0 194
M30 x 3.5 281
M33 x 3.5 358
M36 x 4.0 481
M45 x 4.5 1050

© 2017 Emerson. All rights reserved.

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