Val-Matic 30 and Larger Butterfly Valve With LSA Actuator and External Stops - Manual (Page 4)

3
INSTALLATION
The Val-Matic butterfly Valve is Bi-Directional,
however, when deciding the valve’s installation
orientations, the engineer should consider the seat
position in regards to flow and access. The following
guidelines are intended to assist the engineer. The
“SEAT END” and “SUGGESTED FLOW” are marked
on the valve nameplate, which is mounted on the
flange O.D. The seat end identifies which end the seat
can be adjusted from when the valve is closed. The
flow direction may affect valve torque for large valves.
Some specific piping problems are also shown in the
figures to the right.
GENERAL PIPELINE APPLICATIONS: Orient the
“Seat End” towards the access point (i.e. manway,
pipe coupling, or spool).
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.
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. The valve will seal tightly
against return flow allowing seat adjustment if
necessary. 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# or AWWA C207
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#, ANSI Class 250# or AWWA
C207 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
CAUTION: ADJACENT PIPE MUST BE
SUPPORTED OR STIFFENED TO
PROVIDE A ROUND MATING
CONNECTION FOR THE VALVE
IN SERVICE.