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© 2012 Emerson plc. All Rights Reserved.www.valves.emerson.com
KEYSTONE SLURRY CONTROL VALVES
FIGURE 638 SERIES E/SERIES 2
Complete assembly instructions for DN 250 - 600 Class 150, 300 and
600 slurry control valves
VCIOM-02911-EN 15/09
ASSEMBLY PROCEDURE
1. Press new glacier bearings (9) into upper
and lower inserts (7/8).
2. Fit O-rings (15) on both upper and lower
inserts (7/8).
3. Stand liner vertically on ground
(See note 1) and insert disc end spacers
(10) and lockrings (if applicable) into the
bores of the liner (2) from the outside,
inwards, complete with:
• Shaft seal O-ring (14)
• Disc end spacer O-ring (16) (See O-ring
detail overleaf).
NOTE: Assemble DN 250 and DN 300 valves with
off centre shaft bores furthest from ground.
4. Slowly lower body (1) over the liner (2)
ensuring shaft bores are aligned correctly.
5. Lower and support disc (3) in the open
position, between disc end spacers (10)
ensuring shaft bores are aligned.
6. Insert shaft (6) with gland follower (12),
upper insert (7) and DES springs (11),
through the top end of the body and disc,
ensuring that all components are correctly
aligned.
NOTE: The use of excessive force may cause
O-ring damage. DES springs must be installed
with tapers opposing to form gaps between
springs. (see diagram over leaf)
7 Insert DES springs (11) and lower insert 8)
Into the bottom end of the valve body (1),
ensuring that all components are correctly
aligned.
NOTE: The use of excessive force may cause
O-ring damage. DES springs must be installed
with tapers opposing to form gaps between
springs.
IMPORTANT NOTES FOR VALVE ASSEMBLY
a) Use silicon lubricant on all O-rings.
b) Use soft dolly’s for assembling components
when necessary.
c) Clean all reusable components before
reassembly.
d) All fasteners to be coated with anti-seize
compound.
e) Execute EXTREME CAUTION when
assembling valves with ceramic
components.
f) If components do not fit DO NOT force them.
8. With disc (3) in the closed position, line up
the disc pin holes and drive in the disc pins
(4) central to shaft.
9. Fit gland packing (13), gland studs (19) to
maximum depth and tighten gland nuts (19)
10. Fit the end cover O-ring seal (17),
11. Loosen off locknut (22) on end cover (25),
and back off adjustment screw (21).
12. Fit end cover with stainless steel thrust
washer backing disc and new Teflon thrust
washer (21, 24 and 23).
13. Adjust set screw (21) until the disc (3) is
centralised in the liner (2), and tighten
locknut (22).
14. Check the operation of the valve by
modulating the shaft and disc.
15. Drive in the disc pin inserts (5) until flush to
disc (3). (See pinning detail overleaf).
16. The valve is now ready for installation.
Refer to installation and commissioning
instructions.
17. The gland may need to be adjusted on plant
start up.
2
TYPICAL ASSEMBLY - LOWER O-RING DETAIL
KEYSTONE SLURRY CONTROL VALVES
FIGURE 638 SERIES E/SERIES 2
(15) Insert O-ring
(2) Liner
(6) Shaft
(6) Shaft
(5) Disc drive screw
(8) Lower insert
(6) Shaft
(13) Gland packing
(7) Upper insert
(3) Disc
(16) DES O-ring
(16) DES O-ring
(15) Insert O-ring
(11) Des springs
(1) Body
(3) Disc
(9) Bearing
(9) Bearing
(9) Bearing
(9) Bearing
(14) Shaft seal O-ring
(10) Lock ring
(10) DES Loader
(23) Thrust washer
(24) Backing disc
(4) Disc pin
(3) Disc
(10) DES ring
(16) DES O-ring
(16) DES O-ring
(14) Shaft seal O-ring
(2) Liner
(10) DES loader
(10) DES O-ring
(17) End cover O-ring
(25) End cover
(1) Body
(22) Lock nut
(21) Tension screw
(11) DES springs
DISC PINNING DETAIL
TYPICAL ASSEMBLY - UPPER O-RING DETAIL
© 2017 Emerson. All rights reserved.
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