Val-Matic Swing Check Valve User Manual

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VAL-MATIC'S SWING CHECK VALVE

OPERATION, MAINTENANCE AND INSTALLATION

INTRODUCTION

Val-Matic's Swing Check Valve has been designed
to give many years of trouble free operation. All
parts are inspected prior to final assembly to
insure complete interchangeability of parts. After
assembly, each valve receives a hydrostatic seat
test, using a pressure equal to the valves rated
working pressure and a hydrostatic shell test,
using a pressure equal to the hydrostatic shell test
pressure outlined in AWWA C508 for the valve's
flange class. The valves are designed to meet
AWWA C508 which covers 2” through 24”. The
pressure rating of the 2” through 24” is 250 psi.
The 30” through 48” valves meet the intent of
C508 and are design for 150 psi in cast iron or 250
psi in ductile iron.

This manual will provide you with the information
needed to properly install and maintain the valve
and to ensure a long service life. The valve is
opened by the fluid flow in one direction and
closes automatically to prevent flow in the reverse
direction.

Optional lever and spring, lever and weight and air
cushion may be mounted on the valve to allow for
better control of surges and valve slamming
closed.

Optional Limit Switches may be mounted on the
valve to provide local and remote position
indication.

The valve is capable of handling a wide range of
fluids including flows containing suspended solids.
The size, flow direction, maximum working
pressure, and model no. are stamped on the
nameplate for reference.

CAUTION
Do not use valve for line testing at pressures
higher than nameplate rating or damage to
valve may occur.

The "Maximum Working Pressure" is the non­shock pressure rating of the valve at 150
valve is not intended as an isolation valve for line
testing above the valve rating.

o

F. The

RECEIVING AND STORAGE

Inspect valves upon receipt for damage in

Page 2 of 13

shipment. Unload all valves carefully to the ground
without dropping. Valves should remain crated,
clean and dry until installed to prevent weather
related damage. When lifting the valve for
installation, make sure that lifting chains, slings or
straps are not attached to or allowed to come in
contact with the seat areas, hinge pin,
counterweight arm or the side mounted air cushion
assembly. Use hoist rings or lifting eyebolts in
cover lifting tapped holes or use hoist rings
through the flange holes on large valves.

WARNING
Use caution if using threaded holes in
cover for lifting the valve. All three eye
bolts should share the entire weight
directly and equally.

Use of additional slings and/or straps is
recommended for safety and ease of
orientation during installation.

Table 1. Cover Lifting Eye Bolts

Valve Lifting Valve Lifting
Size Eye Bolt Size Eye Bolt
14” M14 30” M24
16” M16 36” M24
18” M20 42” M30
20” M20 48” M30
24” M20

Do not rest the weight of the valve on the hinge
pin, counterweight arm or the side mounted air
cushion assembly.

This precision equipment must remain crated,
clean and dry until installed; to prevent weather
related damage to the valve or to the pneumatic
cylinder. Improper storage and installation
procedures will void warranty.

For long term storage greater than six months, the
rubber surfaces of the disc should be coated with
a thin film of FDA approved grease such as
Lubriko #CW-606. Do not expose disc to sunlight
or ozone for any extended period.

VAL-MATIC'S SWING CHECK VALVE

OPERATION, MAINTENANCE AND INSTALLATION

VALVE CONSTRUCTION

The Swing Check Valve housing consists of a
body section having integrally cast inlet and outlet
flanges. The top portion of the body has a large
integrally cast flanged access port, to which the
top access cover is bolted. The size of this access
port permits full access to the disc and seat
components for maintenance or replacement.

The flow area through the body inlet, body seat
ring and the body outlet is equal to 100% of the
nominal inside area of the standard pipe. The
center portion of the body is expanded to allow for
the area that is occupied by the disc and because
of the expanded area thru the center of the valve,
the disc at 20 to 25 degrees open reaches a full
flow area.

COVER

HINGE
PIN

YOKE ARM

DISC

FLOW

BODY

FIGURE 1. SWING CHECK VALVE

The body has two eccentrically located hinge pin
trunnions that contain the hinge bushings and
hinge packing. A continuous stainless steel hinge
pin passes through the bushings and the disc yoke
arm. The disc yoke arm is keyed to the hinge to
lock them together rotationally. The disc is
attached to the disc arm with two stainless steel
pins, making the disc and disc yoke arm a solid
assembly. The Buna-N disc seal ring fits into a
recessed register in the face of the disc and is
captured and retained by a large circular retaining
ring or segments and stainless steel screws. The
Buna-N disc seal has O-ring type sealing beads
that provide low pressure sealing when it contacts
the stainless steel seat ring, located in a machined
register in the body. The seat ring has a groove on
its outside diameter, which accepts an O-ring, that

STOP
BOLT

creates a seal between the interface of the inside
diameter of the body register and the outside
diameter of the seat ring.

The stainless steel body seat ring is threaded into
the body in 2” through 12” sizes and retained to
the body with stainless steel set screws that
engage a groove within the body seat register in
larger sizes. The exterior portion of the body has
machined mounting pads on each side of the
valve. The lower portion of the air cushion
assembly is mounted to these pads. An additional
pad accepts a spring assembly.

The counterweight arm assembly is keyed to the
extended portion of the pivot shaft. The
counterweight arm assembly has additional
keyways to allow for multiple mounting positions
such as horizontal or about 30° below when
closed. The counterweights are located on the
counterweight arm and are secured to the lever
with a bolt.

The body and the top cover are provided with
plugged ports. The body port serves as a drain
port and the top cover's port serves as a
connection point for an automatic air release valve
or as a vent port. A drain valve may also be
connected to the body port.

DESCRIPTION OF OPERATION

The valve is designed to prevent reverse flow
automatically. During system flow conditions, the
movement of the fluid forces the disc to the open
position allowing 100% un-restricted flow area
through the valve. Under reverse flow conditions,
the disc automatically returns to the closed
position to prevent reverse flow.

Upon pump start-up the forward flow of the water
will start to rotate the disc about the hinge until the
disc contacts the stop bolt in the valve body. The
disc rotates through a 60 to 70 degree arc from
the closed to the fully open position. On pump
shut down the forward velocity of the water will
start to diminish, as the forward velocity of the
water is further reduced, the disc will start its travel
to the closed position. When the forward velocity
of the water reaches zero, the disc has moved to
the closed position and the reversal of the flow is
checked. Under these ideal hydraulic conditions
the valve should close without water hammer.
However, ideal hydraulic conditions are not always
predictable and the potential for water hammer
exists. If the reversal of flow happens before the

Page 3 of 13

VAL-MATIC'S SWING CHECK VALVE

OPERATION, MAINTENANCE AND INSTALLATION

disc has a chance to react to the diminishing
forward velocity of the water, the disc will be
driven to the closed position by the rapid flow
reversal. Depending on how fast the reversal of
flow takes place, a water hammer of different
magnitudes will develop.

The valve is available with an adjustable lever and
weight, an optional and adjustable lever and
spring assembly and a side mounted air cushion.
These assemblies and adjustments may be used
to vary the valve’s closing operation in order to
reduce the magnitude of the closing water
hammer.

The side mounted air cushion was designed to
solve minor water hammer problems. It should be
stated, that because the control media is only a
small volume of air at atmospheric pressure, that
is compressed to a maximum of 200 PSI and then
vented to the atmosphere thru a small flow control
valve, it should not be considered as a total
solution for severe water hammer problems.

INSTALLATION

The swing check valve with spring, weight and
lever, or weight, lever and
cushion can only be used for horizontal flow or
vertical flow-up applications. The valve must be in
a laminar flow region of the piping system. Avoid
locating the valve immediately downstream of a
pipe elbow or in a cavitation zone because the
turbulence in these regions will cause excessive
disc motion and will result in premature wear.

For horizontal flow applications the valve must be
installed with both of the pivot trunnions located
above the horizontal center-line of the valve and
the common center-line of the hinge trunnions
must be level to the horizontal plane of the valve.
For vertical flow up applications the counterweight
arm should be in the horizontal or about 30° below
horizontal position when the valve is
position. The counterweight arm has multiple
keyways to allow for mounting in several
orientations.

Before installing the valve in the space provided,
check to make sure that the pump discharge
piping is free of foreign objects such as lumber,
tools, rocks, etc., which can damage the swing
check valve when it is placed in service.

side mounted air

in the closed

When lifting the valve for installation, make sure
that lifting chains or straps are not attached to or
allowed to come in contact with the hinge pin,
counterweight arm or the side mounted air cushion
assembly. Also do not allow the weight of the
valve to rest on the hinge pin, counterweight arm
or the side mounted air cushion assembly.

Each valve is provided with a flow arrow integrally
cast on the valve cover. The flow arrow must
point in the direction the water will flow, when the
system is operating.

AWWA C508 swing check valves are furnished
with flat faced flanges and should only be mated to
a flat faced companion flange. A full faced or ring
gasket, that has been lubricated with a gasket joint
compound, must be installed between the valve's
flange and the companion flange to effect a seal.
Flange bolting shall be in accordance with ANSI
B16.1 Section 5.2 for cast iron bodies and ANSI
B16.42 for ductile iron bodies. Note: Val-Matic
does not recommend the use of high strength
flange bolting with these valves.

Before installing the flange bolting, the valve and
the adjacent piping must be supported and aligned
to prevent cantilevered stress being transferred to
the valve's flanges when installing the flange bolts
or studs.

Apply a thread lubricant to the flange bolt threads
and install the flange bolts and nuts around the
flange. Once all the flange bolts or studs are
inserted around the flange bolt circle, tighten them
hand tight.

Recommended flange bolt lubricated target torque
values for use with resilient gaskets (75
durometer) are given in Table 1. If leakage
occurs, allow gaskets to absorb system fluid and
check torque and leakage after 24 hours. Do not
exceed the bolt rating, the maximum torque of
Table 1, compress to more than the gasket
manufacturer’s thickness recommendation or
extrude gasket.

Page 4 of 13