Thermoplastic valves should be stored at room temperature indoors in their original containers to keep them clean and to avoid damage. Valves with elastomer seats and seals should be stored in cool and dark conditions and for not more than a year. Failure to store valves properly could void warranty.
Socket: Provides a stronger connection than threading and is preferred in
permanent installations. Socket dimensions are in conformance with
ASTM D2467.
Solvent Cemented: Compatible with PVC and CPVC Valves, using normal solvent cementing techniques. Caution should be taken that cement does not get on the inside face of the end connection or inside the valve. Refer to cement manufacturer's guidelines for bonding temperature limitations and recommended cementing cure times.
Note: Shelf life of solvent cement
is limited to the time advised by the manufacturer. That is approximately
one year for CPVC and two years for PVC.
Socket Fusion (Thermal Bonding):
The superb resistance of PVDF and PP to organic solvents, including
solvent cements make it necessary to join those socket connections,
in 1/2" thru 4" sizes, by thermal bonding technique.
Butt Fusion (Thermal Bonding): A
heat fusion technique necessary for joining PVDF and PP butt end
connections to similar material piping.
Threaded: Preferred when occasional
disconnecting of piping system is necessary, but limited to a maximum
of 4 inches in diameter. Thermoplastic pipe of Schedule 80 or heavier
should be used because threading reduces the effective wall thickness,
resulting in a reduction in pressure rating to one-half that of
solvent cemented or thermal bonded socket connections. Threads are
American Standard Tapered Pipe Threads per ANSI B2.1.
Preparation for assembly consists of wrapping
the pipe threads with Teflon (TFE) tape, starting with the second
thread from the end and wrapping in the direction of threads, with
a slight overlap. After a hand-tight assembly, an additional 1/2
to 1-1/2 turns with a strap wrench will complete the connection.
Care must be taken to not overtighten, which can cause distortion
or even failure of threads.
Flanged: Manufactured to ANSI
B16.5, (150lb. class). Available in most all sizes and most widely
used throughout the industry for process systems that require occasional
dismantling. Thermoplastic flanges may be connected to pipe or fitting
by the method required by the individual material. A full flat face
elastomeric gasket seal of a 50 to 70 durometer hardness , is required
between flanges, with the exception of Butterfly Valves in which
the fully booted body seat liner acts also as the gaskets.
Joining Flanges:
- Carefully observe for proper alignment of bolt holes, and also
for parallelity and closeness of mating flanges.
- Position gasket seal. Then insert and lubricate all bolts, using
flat washers under bolt heads and nuts.
- With a wrench on bolt head, tighten each nut with a torque wrench
in a pattern, diametrically opposite each other, as shown below.
Do this in increments until finally reaching the recommended torque
values charted below.
Flange Size
(in.) |
Recommended
Torque (ft.lbs.)* |
1/2"-11/2" |
10-15 |
2-4 |
20-30 |
5-8 |
30-45 |
10 |
50-75 |
12 |
80-110 |
14-24 |
100 |
|
Tightening Pattern for Flange Bolts |
Coupling Nuts: On all true union style valves when installing into pipe line, nuts should be tightened by hand. It is not recommended to use pipe or strap wrench.
Safety Block True Union Ball Valves:
Adjustment for ball to seat tightness: (a) Sizes 1/2" thru
4" - Remove coupling nut on adjusting end of valve. Use valve
handle on threaded cartridge and turn 20° clockwise. Replace coupling
nut hand tight.
(b) Do not over-tighten or handle will not turn valve from open
to close position and forcing valve to open or close after over-tightening
will break stem or handle.
Ball Check Valve: No adjustment
is required other than making certain that the union nuts are tight.
Install in line with the flow arrow in the same direction as the
fluid flow.
Caution should be taken not
to install a Ball Check too close to a discharge pump. The resulting
turbulent fluid flow may cause ball chatter and internal valve damage.
Butterfly Valve: Always install
between two pipe flanges, and never with a gasket seal. The outer
rim of the elastomeric valve seal acts as the gasket seal. Refer
to previous section "joining flanges"
Diaphragm Valve:
Installation:
- Refer to section " Joining Flanges" and follow written
procedures.
- Sizes 3" and larger have a bonnet grease fitting. Lubricate
before placing valve in service.
- Use torque wrench, follow same recommended torque's shown for
flange bolt connections and tighten body/bonnet bolting.
- Full open flow setting has been set at factory before factory
pressure testing.
Maintenance:
- The TVI thermoplastic diaphragm valves require no maintenance
other than periodic grease fitting lubrication.
Operating: Manual handle control, arrow on top of handle gives direction for open and close positions.
Maintenance: The valve requires no maintenance. If seat or surface of ball wears, due to abrasion and valve does not shut off tightly, valve can be adjusted.
Adjustment: The operating handle is the tool for tightening the adjusting cartridge (seat carrier part No. 4). Remove body from pipe line by loosening coupling nuts. Remove handle from stem. Place handle hub into seat carrier and give quarter turn clockwise. Reassemble valve and reconnect to pipe line.
Operating: Manual handle control, arrow on top of handle gives direction for open and close positions.
Maintenance: The valve requires no maintenance. Valve cannot be adjusted. When materials wear and valve begins to leak, valve must be replaced.
Operating: Lever type manual operation. The handle position is the indicator of the blade position in the body. When the lever handle is perpendicular to the pipe line, the blade is in the closed position. If the lever handle is parallel to the pipe line the valve is open.
Important: The handle has a ten position locking plate. The lever part No.16 must be disengaged from the locking plate before moving the handle part No. 13 to position desired.
Operating: Manual Gear type with handwheel or chainwheel. Revolving indicator plate mounted on top of gear box moves to indicate the position of the blade. Mechanical stops are furnished. They can be adjusted to increase or decrease travel into open or closed position.
Maintenance: No maintenance required. If valve is to be stored for any length of time, it should be stored in dark and cool condition to lengthen the shelf life of the full faced elastomeric liner seat. Also in outside pipe lines exposed to sun light precautions should be taken to eliminate valve failures. Expansion joints in the pipe line are necessary to combat pipe expansion causing crushing and fracturing the flanged portion of the full faced elastomeric liner. This will push the rubber into the seating area and bind the operation of the valve. If an outdoor pipe line subject to direct sun light is not normally conveying flow materials the heat can deteriorate the elastomeric liner and shorten life of valve seat.
Manual Gear type operator should be repacked with axle grease every 18 to 24 months. Remove indicator cap Part No. 11 and then the top cap Part No. 9. Pack gears with normal amount of axle grease and reassemble.
Operating:
The flow material direction operates the valve. The valve will close
under back pressure of flow material.
Maintenance:
Periodic maintenance is not required. If parts wear and
need replacing the Horizontal Swing Check valve does not need to
be removed from piping system. It is necessary to shut off line
pressure. Remove valve bonnet and shaft holder bolt and all parts
can be easily removed. The ball check valve requires the loosening
of the coupling nut.
Operating:
All size valves are equipped with a handwheel for controlling
flow. Valves can be pneumatically or electrically operated as an
option.
Maintenance:
1/2" through 2" True Union Diaphragm Valves require no
maintenance. Flanged valves 3" through 10" have a grease
fitting on the bonnet. Standard axle grease should be injected one
time every 18 months. Replacing rubber or TFE diaphragm requires
removing bonnet and unscrewing diaphragm. When replacing new diaphragm
be sure to have seating cross bead directly above body seating ridge.
The body seating ridge runs perpendicular to flow stream.
Operating: Manual
handle indicates open and closed position of valve.
Maintenance: If valve leaks because
of seat wear, seats can be replaced by removing nuts and bolts and
removing worn seats. Valve may also leak because of worn seals.
They can also be replaced. After removing nuts and bolts ball can
be turned sideways and removed from stem. Stem can then be removed
and seals replaced on the stem if necessary. When replacing nuts
and bolts make sure that all are tightened to the same degree for
bubble-tight shutoff.
Adjustment: This
valve cannot be adjusted for seat wear. Seats must be replaced.
For more information about our products please go to our Information Request page
Thermoplastic Valves Inc. 53 South Seventh Street Emmaus, PA 18049
610-967-6388 FAX: 610-967-6448 • email: tvi2@fast.net
