Val-Matic Rubber-Seated Ball Valve - Manual (Page 6)

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10. Buried valves installed with valve boxes shall be
installed so that the valve box does not transmit
shock or stress to the valve actuator as a result of
shifting soil or traffic load.
11. When valves are installed in vaults; the vault
design shall provide space for removal of the
valve-actuator assembly for purposes of repair and
for access to adjust the thrust bearing assembly.
The possibility of groundwater or surface water
entering the valve and the disposal of the water
should be considered. The valve-operating nut
should be accessible from the top opening of the
vault with a tee wrench.
12. Ball valves are self-contained devices that may not
function properly or remain tight if subjected to
external forces. If a valve is rigidly installed in a
pipeline using flanged joints, the whole assembly
of pipe and valves can be stressed by temperature
changes, settlement, and exceptional surface
loads.
13. When buried, the valve should be bolted to flanges
of the adjacent piping with no other rigid support
provided under or around the valve body. In no
case shall the valve body be supported directly by
a rigid saddle or other structure. In this condition,
the valve becomes an anchor or a support for the
piping system and must transmit piping loads.
TABLE 2
150# FLANGE BOLT TORQUES
VALVE BOLT RECOM MAX
SIZE DIA TORQUE TORQUE
(in) (in) (ft-lbs) (ft-lbs)
4 5/8 30 150
6 3/4 30 150
8 3/4 40 150
10 7/8 45 200
12 7/8 65 200
14 1 80 300
16 1 90 300
18 1 1/8 100 425
20 1 1/8 120 425
24 1 1/4 150 600
30 1 1/4 175 600
36 1 1/2 175 1000
42 1 1/2 200 1000
48 1 1/2 250 1000
CAUTION: The use of raised-face flanges
or excessive bolt torque may
damage valve flanges.
TABLE 3
300# FLANGE BOLT TORQUES
VALVE BOLT RECOM MAX
SIZE DIA TORQUE TORQUE
(in) (in) (ft-lbs) (ft-lbs)
4 3/4 30 150
6 3/4 30 150
8 7/8 50 200
10 1 75 300
12 1 1/8 100 425
14 1 1/8 100 425
16 1 1/4 150 600
18 1 1/4 150 600
20 1 1/4 200 600
24 1 1/2 300 1000
30 1 3/4 400 1500
36 2 500 2000
42 2 600 2000
48 2 700 2000