Val-Matic Tilted Disc Check Valve - Manual (Page 2)

1
TILTED DISC
®
CHECK VALVE
OPERATION, MAINTENANCE AND INSTALLATION
INTRODUCTION
This manual will provide you with the information to
properly install and maintain the check valve to
ensure a long service life. The Tilted Disc Check
Valve is ruggedly constructed with aluminum-bronze
or stainless steel trim to give years of trouble free
operation. The valve should be installed in water
pipelines three diameters downstream of pumps to
prevent reverse flow.
The valve is designed to open after pump start and
allow water to flow through the pipeline or water
main while creating a minimal amount of headloss.
A top or bottom mounted oil dashpot may be
included to control the opening and closing of the
valve. The valve 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 Valve.
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 lifted
with straps or bolts in the flange holes. The valve
should never be lifted by the dashpot assembly.
The valves should remain crated, clean and dry until
installed to prevent weather related damage. For
long-term storage greater than six months, the
valves should be stored indoors or the ends of the
valve should be sealed with plastic wrap to prevent
weather related damage.
FIGURE 1. Tilted Disc

Check Valve
DESCRIPTION OF OPERATION
The Tilted Disc Check Valve consists of two body
sections bolted together at a central 55-degree
diagonal flange assembly, forming a single valve
body. The inlet body section contains a seat ring
positioned and captured by the diagonal flanges.
The outlet section contains two eccentrically located
pivot pins from which a disc, containing a beveled
disc ring, pivots 40 degrees from the closed to the
fully open position.
The location of the eccentric pivot trunnions allows
the seating surface of the disc ring to rotate away
from the seating surface of the seat ring, without
contact, when the valve opens. Conversely, during
closing the seating surface of the disc ring moves
into the seating surface of the seat ring without
contact, until final sealing contact is made. A small
amount of clearance exists between the pivot pin
and the pivot pin bushing when the disc ring makes
full contact with the seat ring to ensure a tight seal.
The flow area throughout the valve equals or
exceeds the flow area of the pipe, thus minimizing
the head loss through the valve.
CAUTION
For valves with Top Mounted Dashpots, DO
NOT paint exposed surfaces of the
connecting rod or the cylinder piston rod or
damage will result to the hydraulic seals.
CAUTION
The Tilted Disc Check Valve is not intended
for use with sewage or fuel service.