Val-Matic 3-24 Butterfly Valve With LSA Actuator and External Stops - Manual (Page 4)

4
INSTALLATION
The installation of the valve is important for its
proper operation. Some general recommendations
follow. Some specific piping problems are also
shown in the figures to the right.
WATER SERVICE: The normal flow direction is
towards the seat end of the valve. When the flow
stops, the return pressure will be held by the closed
disc and the seat bolts (8) can be adjusted to
provide tight shut off should the seat be worn or
damaged. The normal flow direction and the words
"SEAT END" are marked on the nameplate which is
located on the seat end valve flange.
AIR AND GAS SERVICE: Install valve with
pressure toward the end opposite the seat end.
Lubricate resilient seat with FDA approved silicone
grease such as Dow Corning #7 before installation.
Gear actuators are recommended for gas service
applications.
PUMP DISCHARGE SERVICE: On all horizontal
pump discharge applications (Figure 3), the seat
end
should be towards the pump to allow seat
adjustment with system pressure against the disc.
The valve shaft should be oriented parallel to the
plane of the pump discharge elbow (i.e. vertical
valve shaft on a vertical discharge elbow). If the
butterfly valve is downstream of a check valve, the
clearance between the two discs must be checked.
The butterfly valve shaft should be oriented as
shown in Figure 4.
BURIED SERVICE: The valve should be installed
with the shaft horizontal and the actuator nut
directed upwards (Figure 4). The valve box or
extension pipe should be installed so that the
actuator nut and extension stem turn freely.
FLANGED ENDS: AWWA Class 150B flanged
valves should be mated to ANSI Class 125# flat-
faced flanges equipped with resilient gaskets. When
ring gaskets are used, the bolt material shall be
ASTM A307 Grade B or SAE Grade 2 Carbon Steel.
Higher strength bolts may only be used with full-face
gaskets.
Some of the flange holes are tapped near the shaft
ends of the valve as shown on the Sales Drawing.
Special bolt lengths may be needed. An
engagement of at least one bolt diameter is typically
used for the flange bolts used in the tapped flange
holes.
AWWA Class 250B flanged valves can be mated
with either ANSI Class 125# or ANSI Class 250#
flanges depending on the specified flange drilling.
Class 250B valves can be mated with flat-faced or
raised-face flanges with full face or ring gaskets and
with no bolting restrictions.
FIGURE 3. PUMP DISCHARGE.
FIGURE 4. UPSTREAM CHECK VALVE