Rovalve S20
Installation and Maintenance Instructions
Tyco reserves the right to change the contents without notice ROVMC-6614-EN-0904
1. General information
The ROVALVE S20 knife gate valve is a UNIDIRECTIONAL (one-way shut-off) product.
Unidirectional valves have a preferred shut-off direction.
CAUTION
Care must be taken in valve installation with respect to direction of flow.
Unidirectional valves have the preferred direction of shut-off
indicated by the word "SEAT" cast into the valve body or the
word "SEAT" stamped on the upper right hand corner of the gate
on the seat side. A unidirectional valve is normally installed with
the seat side (preferred direction) downstream, with the line
pressure pushing the gate toward the seat.
CAUTION
The user is responsible for correct directional installation.
On select applications, including low pressure - dry solids applications, greater performance may
be realized by installing the S20 in the reverse flow position. Valves supplied with backing rings are
normally installed in a reverse flow orientation, with the seat side of the valve upstream. Contact
factory for details and additional recommendations.
Initial inspection:
1. Examine entire valve and report any damage or discrepancies immediately.
2. Accessories, if any, including solenoids, limit switches, positioners, etc., are tested for
functionality prior to shipment. Examine carefully for damage which may occur during shipment.
3. Operators: Standard manual handwheels may be shipped loose for field installation. It is
necessary to use a pipe wrench or large crescent wrench to properly tighten the handwheel
retaining nut. Be sure to fully tighten.
4. Packing assembly: The packing gland bolts should be checked and adjusted to obtain a first
time packing seal. Packing gland bolts and or nuts may become slightly loose when valve is
shipped. Field adjustment is expected and desired. Tighten each nut equally just enough to
stop any leakage. Overtightening may increase valve operating torque and shorten packing life.
Thank you for purchasing a ROVALVE S20
knife gate valve product from Tyco Flow
Control. With proper care it should provide
you a long service life.
www.tycoflowcontrol.com
Index
1. General information 1
2. Installation instructions 2
3. General maintenance 4
4. Spare parts 4
5. Instructions for repacking 5
6. Stem nut replacement
instructions 6
7. Suggested cylinder support when
cylinder is mounted horizontal 7
8. Instructions for converting a
MH to bevel gear operator 8
9. Recommended long term storage
procedure 9
Tables and figures
Table A: Maximum flange bolt torques 2
Table B: Knife gate valve dimensions,
per MSS-SP81 3
Table C: Valve dimensions 3
Table D: Packing sizes 5
Figure 1, Retaining nut assembly 1
Figure 2, Packing gland nuts 1
Figure 3, Blind-tapped holes 2
Figure 4, Flange bolts 2
Figure 5, Envelope dimensions 3
Figure 6, Inspection points 4
Figure 7, Spare parts-topworks 4
Figure 8, Spare parts-valve body 4
Figure 9, Repacking instructions 5
Figure 10, SM636 packing 5
Figure 11, Stem nut replacement
instructions 6
Figure 12, Pin-style lockouts 8
Figure 13, BG conversion 8
Figure 1 Figure 2
Assemble handwheel,
be sure and fully
tighten handwheel
retaining nut
Inspect and tighten packing
gland nuts to stop any
leakage.
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