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Thermoplastic Valves Product Guide & Engineering Specifictions
Solvent Cement Welded Joints
Made in the U.S.A. Suitable for Oil-Free air handling to 25 psi, not for distribution of compressed air or gas Page 830
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Step 5: Apply Primer
Primer is necessary to penetrate and soften both pipe
and fitting socket surfaces in order for the solvent
cement to properly bond. THE MOST FREQUENT
CAUSE OF JOINT FAILURES IS INADEQUATE
SOLVENT PENETRATION AND SOFTENING OF
BONDING SURFACES DURING THE WELDING
OPERATION.
1. Using a brush or applicator size no less than 1/2
the pipe diameter, apply a liberal coat of primer
with a scrubbing motion to the fitting socket until
the surface is softened and semi-fluid. This may
take 5 to 15 seconds depending on size and tem-
perature (larger diameters and lower temperatures
will increase required time).
2. Apply primer to pipe in the same manner, extend-
ing application area to slightly more than the inser-
tion depth into the fitting socket.
3. Apply a second coat to both the fitting socket and
the pipe.
4. Check penetration and softening by scraping the
primed surfaces. A few thousandths of the semi-
fluid surface should be easily removed. Repeat
primer application if necessary.
Step 6: Apply Solvent Cement
Solvent cement must be applied IMMEDIATELY to
primed surfaces before the primer dries in an alter-
nating 3-coat application. Using a brush or applicator
size no less than 1/2 the pipe diameter, apply a liberal
coat of solvent cement to the primed pipe surface,
then apply a light to medium coat to the primed fitting
socket. If a “net fit” was experienced during dry fit
check (Step 4), apply an additional coat again to the
pipe surface. BE SURE TO USE A VERY LIBERAL
AMOUNT OF SOLVENT CEMENT ON PIPE.
VALVE INSTALLATION CAUTION: TAKE EXTRA
CARE THAT NO PRIMER OR SOLVENT CEMENT
IS ALLOWED TO CONTACT THE BALL OR OTHER
INTERNAL VALVE COMPONENTS.
Step 7: Join Components
IMMEDIATELY following application of cement and
before it starts to set, insert the pipe into the fitting
socket with a one-quarter turn, twisting motion to
evenly distribute cement within the joint. A full bead
of cement should form around the circumference of
the joint. Hold joint together for approximately 30 sec-
onds to make sure the pipe does not move or back
out of the socket.
CAUTION: ABSENCE OF BEAD FORMATION,
VOIDS, OR GAPS IN THE BEAD ARE A SIGN OF
INSUFFICIENT CEMENT APPLICATION. IF SUCH
IS OBSERVED, IMMEDIATELY PULL THE JOINT
APART AND REAPPLY AN ADEQUATE AMOUNT
OF CEMENT.
Step 8: Remove Excess Cement
Using a cloth, wipe clean all excess cement from the
exterior juncture of the pipe and fitting.
Step 9: Initial Set Time
The joint must not be handled or moved for a mini-
mum of 2 minutes, after which the joint must be
handled carefully until the cement has gone through
a set period. Recommended minimum set time:
30 minutes minimum at 60° to 100°F (15° to 40°C)
1 hour minimum at 40° to 60°F (5° to 15°C)
2 hours minimum at 20° to 40°F (-5° to 5°C)
4 hours minimum at 0° to 20°F (-20° to -5°C)
Step 10:
Joint Cure Time
The joint must adequately cure prior to use (see
“Joint Cure Schedule” table below). Required cure
time depends on temperature, pipe diameter, and
pressure application. The following table is based on
the guidelines of ASTM D 2855, “Standard Practice
for Making Solvent-Cemented Joints with Poly Vinyl
Chloride (PVC) Pipe and Fittings”. It is the user’s
responsibility and risk in determining that the joint has
properly cured for handling, testing, and use.
Joint Cure Schedule
NOTE: Extreme caution should be used when solvent cementing joints at temperatures below 10°F, and many variables exist at temperatures below 20°F.
Relative humidity greater than 50% will increase required cure times specified. Consult solvent cement manufacturer for additional information.
Temperature 60° - 100°F 40° - 60°F 20° - 40°F 10° - 20°F
Nominal Pipe
Size (in.)
Test Pressure (psi)
0-180 181-315
Test Pressure (psi)
0-180 181-315
Test Pressure (psi)
0-180 181-315
Test Pressure (psi)
0-180 181-315
1/2 to 1-1/4 1 hour 6 hours 2 hours 12 hours 6 hours 36 hours 8 hours 48 hours
1-1/2 to 3 2 hours 12 hours 4 hours 24 hours 12 hours 72 hours 16 hours 96 hours
3-1/2 to 5 6 hours 18 hours 12 hours 36 hours 36 hours 4 days 72 hours 8 days
6 to 8 8 hours 24 hours 16 hours 48 hours 3 days 9 days 4 days 12 days