Val-Matic Wafer and Globe Style Silent Check Valve - Manual (Page 2)

WAFER AND GLOBE-STYLE SILENT CHECK VALVE
OPERATION, MAINTENANCE AND INSTALLATION
INTRODUCTION
1
Globe Style
IGURE 1. SILENT CHECK VALVES
n pump shut-down, the spring closes the disc
efore a flow reversal takes place. This type of
losure, which prevents flow reversal, is the factor
hich allows “silent” operation and prevents water
ammer associated with check valve slam.
he valve body is supplied with either compact
afer ends as shown in Figure 1 for installation
etween mating in a flanged
onfiguration, Figure
the plug and
pring. The body bushing controls the movement of
This manual will provide you with the information to
properly install and maintain the valve to ensure a
long service life. The Silent Check Valve is ruggedly
constructed with bronze or stainless steel trim to
give years of trouble free operation. The valve
should be installed in horizontal or vertical pipes
carrying clean water. 14” and larger valves should
be equipped with special springs for operation in
vertical flow down applications.
The Silent Check Valve is designed to open fully to
provide flow in the forward direction and close
rapidly upon flow reversal. The valves are used to
prevent reverse flow through pumps or in piping
systems. The size, cold working pressure, and
model number are stamped on the nameplate for
reference.
This valve is not intended for fluids containing
suspended solids such as wastewater. For
wastewater and other high turbidity applications, use
Val-Matic Series 500 Swing-Flex
®
Check Valves.
RECEIVING AND STORAGE
Inspect valves upon receipt for damage in shipment.
Unload all valves carefully to the ground without
dropping. When lifting, the valve should be secured
by the body and never lifted by the bronze or
stainless steel trim.
The valves should remain crated, clean and dry until
installed to prevent weather related damage. For
long term storage greater than six months, the
rubber surfaces of the seat (when provided) should
be coated with a thin film of FDA approved grease
such as Lubriko #CW-606. Do not expose rubber
seat to sunlight or ozone for any extended period.
DESCRIPTION OF OPERATION
The silent check valve is designed to prevent
reverse flow automatically. On pump start-up, the
flow of water enters the valve from the seat end (left
side in Figure 1) and forces the disc open, allowing
the passage of fluid through the valve.
Wafer Style
F
O
b
c
w
h
T
w
b
flanges or
2. c
The only moving parts in the valve are
s
the plug and assures that the plug contacts the seat
evenly. The valve may have an optional resilient
seal for drop tight service.
CAUTION: This valve is not intended for
fluids containing suspended
solids or hazardous fluids.