Rovalve S20
Installation and Maintenance Instructions
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page 2
Table A maximum flange bolt torques
(Foot pounds)
Size
Torque
5/8
55 +/-5
3/4
65 +/-5
7/8
110 +/-5
1
135 +/-5
1 1/8
150 +/-5
1 1/4
200 +/-5
1 1/2
250 +/-5
Figure 4
2. Installation instructions
Please take note of the specific installation tags provided with each valve.
1. The mating line flanges must be properly aligned prior to attempting installation. Slip on or weld
flanges can be used. Never try to make up for misaligned pipe flanges by the line bolting. Pipe
supports and/or expansion joints should be used to minimize pipe loads on valves.
2. Flange gaskets suitable for the application are required, sized to fit the raised face of the valve.
3. The ROVALVE S20 is suitable for use in either vertical or horizontal lines. If operator is other
than vertical, additional support may be required if valve is not handwheel operated.
4. The port flanges of the S20, 2" through 24" are drilled and tapped to ANSI B16.5/150, 30" and
36" are per MSS-SP44 with the face to face per MSS-SP81. The bolt holes in the chest or
upper flange area are blind tapped, (see Figure 3).
CAUTION
Care must be taken when installing studs or bolts in the tapped holes of the flange in the
valve chest area to prevent damage. See figure 4.
5. Cap screws or bolts that are too long can pinch the valve body, thereby forcing the body wall
into the gate, springing the gate out of line. Additional damage can occur on the gate face,
such as scoring or scratching of the gate. This type of damage normally requires the valve be
returned to our shop for repair.
6. To avoid damage, it is recommended that studs be used on all tapped bolt holes, especially the
upper chest holes. If cap screws are used, be sure that they do not enter beyond the depth of
the tapped hole when fully tightened.
Figure 3
Figure 4
Bolt holes in the chest or
upper flange area are blind
tapped
Wrong
Right
Stud with Nut
Cap Screw
Body can be deformed or fractured if flange
bolting is too long or overtorqued.
