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SPEARS®LXT™ TRUE UNION
BALL VALVES & DIAPHRAGM VALVES
Installation Instructions
LXT-3A-0107
These instructions cover general installation
for all Spears®LXT™ True Union Ball, Ball
Check & True Union Diaphragm Valves. All
applicable instructions & procedures should be
read thoroughly before starting. Suitability of the
intended service application should be determined
prior to installation. Plastic piping systems should
be engineered, installed, operated & maintained in
accordance with accepted standards & procedures
for plastic piping systems.
SPECIAL INSTALLATION INFORMATION
True Union type ball valves use removable end
connectors. To avoid problems, NEVER ASSEMBLE
THE JOINT TO THE END CONNECTORS
WHILE THEY ARE ATTACHED TO THE VALVE
CARTRIDGE.
Check Valves may be installed in either horizontal or
vertical position with a minimum of 10 pipe diameters from
any pump or other source of turbulence. Check valves
MUST be installed with the valve’s “FLOW” arrow pointing
in the direction of flow.
IMPORTANT: Read Precautions & Warnings for all Valve Installations at the end of
these instructions. It is absolutely necessary that all design, installation, operation and
maintenance personnel be trained in proper handling, installation requirements and
precautions for installation and use of plastic piping systems before starting.
LUBRICATION WARNING: Some Lubricants, including vegetable oils, are known to
cause stress cracking in thermoplastic materials. Formulation changes by lubricant
manufacturers may alter compatibility of previously acceptable materials and are beyond
our control. Lubricants are not required for installation of Spears®Valves.
1. Union Nut
1
1
2
2
3
4
5
6
6
3. Ball Check Valve Body
2. End Connector
4. Ball Valve Body
5. Diaphragm Valve Body
6. Typical Valve Support
INSTALLATION INSTRUCTIONS FOR SOLVENT WELDING APPLICATIONS
Remove Union Nuts (1) and End Connectors (2) from the Valve Body (3)
- (instructions apply to spigot and flanged valves). All components should
be removed from packaging & exposed to the installation environment for a
minimum of 1 hour to thermally balance the components. Wipe clean and match
all components to their assigned identification numbers.
STEP 1 Prepare connecting
pipes as required. Pipe ends must
be cut square at 90° using a wheel-
type cutter or a saw and miter box.
Regardless of the cutting method
used, burrs will be created, which
must be removed. All pipe ends
should be beveled at 10° to 15°.
A deburring tool is recommended,
however a file may be used in its
place as shown.
STEP 2 Remove Union Nuts (1) and End
Connectors (2) from the Valve Body (3). Wipe
away all loose dirt & moisture from the pipes &
components with a clean dry cloth. Slide Union
Nuts (1) over pipe ends where each End Connector
Socket is to be installed, being sure that the Union
Nut threads will be facing the Valve body.
STEP 3 Check the Joint Interference fit
between the pipe and the End Connector Socket
(or fitting socket for spigot end). An Interference
Fit is necessary for proper fusion of the joint. To
check, lightly insert the End Connector Socket
over the prepared pipe ends.
DO NOT FORCE
THE SOCKET ONTO THE PIPE.
Interference must occur between 1/2 the Socket
depth (FULL INTERFERENCE) and the Socket
bottom (NET FIT).
Do not use components
which do not properly mate
.
Make sure that the face of each End
Connector Socket is at a square 90° angle
with the pipe end.
True Union End Connector Socket O-rings must
be free of any signs of dirt & debris. Clean as
necessary. If O-rings must be removed, clean all surfaces and re-install by pressing the
O-ring evenly into its retaining groove, being sure to avoid any wrinkles or creation of an
uneven sealing surface.
Note: Steps 4 through 6 apply to spigot end valves with spigot end being “pipe” and
mating fitting being “end connector.”
STEP 4 Primer is necessary to penetrate & soften both pipe and End
Connector Socket surfaces in order for the solvent cement to properly bond.
Using a brush or applicator size no less
than 1/2 the pipe diameter, apply a liberal
coat of primer with a circular, scrubbing
90°
90°
Deburr Bevel
Socket
Depth
NET FIT
End
Connector
(or Valve
Socket )
½
Socket
Depth
Socket
Depth
End
Connector
FULL INTERFERENCE FIT
(or Valve
Socket )
PIPE DIAMETER CEMENT OR PRIMER APPLICATOR
PIPE
ONE-WAY
MOTION
UNION NUT
Valve
Body
Slide Union Nut onto pipe FIRST
PIPE
Union Nut threads face Valve Body
