Val-Matic Swing-Flex Check Valve User Manual

Manual No.

SFCV-OM1-9

Swing-Flex
Check Valve

Operation, Maintenance and

Installation Manual

INTRODUCTION 1

RECEIVING AND STORAGE 1

DESCRIPTION OF OPERATION 1

INSTALLATION 2

VALVE CONSTRUCTION 2

MAINTENANCE 2

TROUBLESHOOTING 3

DISASSEMBLY 3

RE-ASSEMBLY 3

BACKFLOW ACTUATOR (OPTIONAL) 4

MECHANICAL INDICATOR (OPTIONAL) 5

LIMIT SWITCH (OPTIONAL) 5

BOTTOM OIL DASHPOT (OPTIONAL) 6

PARTS AND SERVICE 7

WARRANTY 7

VAL-MATIC

905 Riverside Dr. ● Elmhurst, IL 60126
Phone [phone] ● Fax [phone]
www.valmatic.com

®

VALVE AND MANUFACTURING CORP.

VAL-MATIC'S SWING-FLEX



CHECK VALVE

OPERATION, MAINTENANCE AND INSTALLATION

INTRODUCTION



The Swing-Flex
to give years of trouble-free operation. 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.

An optional backflow actuator may be mounted on
the bottom of the valve to allow manual backflow
through the valve in the reverse direction.

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

An oil dashpot may be mounted on the bottom of
6” and larger valves to provide slow closure over
the last 10% of travel.

The valve is of the swing check type utilizing an
angled seat and fully encapsulated, resilient disc.
It is capable of handling a wide range of fluids
including flows containing suspended solids. The
Size, Flow Direction, Maximum Working Pressure,
and Series No. are stamped on the nameplate for
reference.

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.

Check Valve has been designed

CAUTION

o

F. The

RECEIVING AND STORAGE

Inspect valves upon receipt for damage in
shipment. Unload all valves carefully to the ground
without dropping. Do not allow lifting slings or
chains to come in contact with the seat area; use
eyebolts or rods through the flange holes on large
valves.

Do not use threaded holes in cover for
lifting the valve. Serious injury may result.

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 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.

FIGURE 1. SWING FLEX

WARNING



CHECK VALVE

DESCRIPTION OF VALVE 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.

Several optional features are a backflow actuator,
mechanical indicator, limit switch and bottom oil
dashpot. All of these options ship loose of the
valve and require field installation.

INSTALLATION



Correct installation of the Swing-Flex

is important
for proper operation. It may be installed in either
horizontal or vertical flow-up applications.
However, when horizontal, the valve must be
installed with the nameplate facing up and the
cover level. In all installations, the flow arrow cast
in the valve cover must be pointed in the direction
of flow during normal system operation.

Do not use threaded holes in cover for
lifting the valve. Serious injury may result.

WARNING

FLANGED ENDS: Flanged valves should only be
mated with flat-faced pipe flanges equipped with
full-face resilient gaskets. The valve and adjacent
piping must be supported and aligned to prevent
cantilevered stress on the valve. Once the flange
bolts or studs are lubricated and inserted around
the flange, tighten them uniformly hand tight. The
tightening of the bolts should then be done in

graduated steps using the crossover tightening

method. Recommended lubricated torque values
for use with resilient gaskets (75 durometer) are
given in Table 1. If leakage occurs, allow gaskets
to absorb fluid and check torque and leakage after
24 hours. Do not exceed bolt rating or extrude
gasket.

The use of ring gaskets or excessive bolt
torque may damage valve flanges.

CAUTION

Valve Bolt Recom. Max.
Size Dia Torque Torque
(in) (in) (ft-lbs) (ft-lbs)

3 5/8 25 90
4 5/8 25 90
6 3/4 30 150
8 3/4 40 150
10 7/8 45 205
12 7/8 65 205
14 1 80 300
16 1 80 300
18 1 1/8 100 425
20 1 1/8 100 425
24 1 1/4 150 600
30 1 1/4 160 600
36 1 1/2 300 900
42 1 1/2 300 900
48 1 1/2 300 1,000

Table 1. Flange Bolt Torques

VALVE CONSTRUCTION



The standard Swing-Flex

Check Valve is
constructed of rugged cast iron with a rubber
encapsulated disc. See the specific Materials List
submitted for the order if other than standard cast
iron construction. The disc is the only moving part
assuring long life with minimal maintenance. The
general details of construction are illustrated in
Figure 2. The body (1) is flanged for connection to
the pipeline with an open top sealed with a cast
cover (2). The disc (3) is retained by the cover.

Item Description Material

1 Body Ductile Iron – 250 psi
Cast Iron – 150 psi
2 Cover Ductile Iron – 250 psi
Cast Iron – 150 psi
3 Disc* Steel With Buna-N Facing
4 Cover Seal* Buna-N or Non-Asbestos
5 Cover Bolt Alloy Steel

*Recommended Spare Part

FIGURE 2. CHECK VALVE CONSTRUCTION

MAINTENANCE



The Swing Flex
scheduled lubrication or maintenance. For service
or inspection, the valve can be serviced without
removal from the line.

VALVE INSPECTION: If inspection of the valve is
required, follow the Disassembly Instructions given
on page 3.

Check Valve requires no