Emerson KEYSTONE FIGURE 955, Installation Instructions

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2
8
1
3
5
7
2
4
6
8
1 3
5
7
2
4
6
R R
50 (2) 12 ½
65 (2½) 12 ½
80 (3) 12 ½
100 (4) 12 ½
125 (5) 15
9
/
16
150 (6) 15
9 /
16
200 (8) 18 ¾
250 (10) 12 ½
300 (12) 16 ⅝
350 (14) 16 ⅝
400 (16) 22 ⅞
450 (18) 35 1⅜
500 (20) 32 1¼
600 (24) 30 1⅛
700 (28) 27 1
1 /
16
750 (30) 32 1¼
KEYSTONE KNIFE GATE VALVES
FIGURE 955/956
FLANGE BOLTS
CAUTION
It is critical that flange bolts do not bottom out in
the valve body tapped holes, as this could cause
damage to the valve chest area. Stud bolts can be
used in blind holes to alleviate the risk of flange
bolts bottoming out.
To determine the bolt length for the blind holes
in the flange bolting , add the width of the mating
flange, + any washers to dimension 'R'.
Coating the flange bolt threads with an anti-seize
compound (e.g. Loctite 729) is recommended to
prevent bolt seizure.
BODY FLANGE TAPPING DEPTH
Valve size Dimensions 'R'
DN (NPS) mm inches
Flange
Valve
Bolt
Bolts for
wafer flanges
Pipe flange
Blind holes
in chest area
Flange
NOTE
If rubber coated pipe flanges are being used, the steel
flange rings (minimum thickness of valve DN 50 - 200
(NPS 2 - 8) of 3 mm (0.12 inches) and DN 250 - 750
(NPS 10 - 30) of 5 mm (0.20 inches)) must be fitted on
both sides of the valve and ensure correct opperation
of seats.
6. Do not use flange gaskets with these valves
as the seats form the seals.
7. Spread pipe flanges to clear valve, lower
valve into position taking care to prevent
damage to the valve seat flange as the valve
is being lowered.
8. Liberally coat all flange bolt threads with an
effective rust inhibitor/anti-seize compound,
and install all flange bolts. Tighten bolts
in a diagonally opposed sequence (see
Figure 2) to assure even tightening of the
flange faces. Ensure bolts in the chest
area of the valve is not bottoming out in the
blind holes. If the valve is being installed to
resilient faced flange(s) care must be taken
to assure the flange bolts are only tightened
sufficiently to allow the resilient facing to
contact the machined valve body face.
9. Ensure the valve flushing system is
operational prior to cycling the valve with
process pipeline media's.
10. Cycle the valve several times, checking for
correct valve operation.
11. After pressurisation of the pipeline, check
flanges and gate gland packing for leaks.
Adjust if necessary.
12. Ensure upper body shrouds and spindle
covers are in place.
FIGURE 1