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Thermoplastic Valves Product Guide & Engineering Specifictions
True Union, Spigot, Flanged Diaphragm Valves
Page 821 Suitable for Oil-Free air handling to 25 psi, not for distribution of compressed air or gas Spears
®
Manufacturing Company
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Sample Engineering Specification
All thermoplastic Diaphragm valves shall be Weir-type constructed from PVC Type I, ASTM D 1784 Cell Classification
12454 or CPVC Type IV, ASTM D 1784 Cell Classification 23447, or Polypropylene, ASTM D 4101. All diaphragms
shall be EPDM, FKM or PTFE with EPDM or FKM backing. All valves shall have built-in position indicator with
polypropylene handwheel. All True Union style valve union nuts shall have Buttress threads. All PVC and CPVC 1/2"
through 2" valves shall be pressure rated to 235 psi, all 2-1/2" through 4" and all flanged valves and valves with PTFE
through 4" backing, shall be pressure rated to 150 psi, all 6" valves shall be pressure rated to 100 psi, and all 8" valves shall
be pressure rated to 75 psi for water at 73°F. All Polypropylene valves shall be pressure rated to 150 psi for water at 73°F,
as manufactured by Spears
®
Manufacturing Company.
Features – PVC, CPVC & PP
This full-featured valve is engineered to provide accurate
throttling control and shutoff for industrial, chemical an
d
water treatment applications. Weir-type design eliminates
entrapped fluids in valve and is excellent for handling liquids
with suspended solids, viscous fluids and slurries. Available in
PVC, CPVC and Glass Filled Polypropylene with a variety o
f
Diaphragm material options. PVC & CPVC 1/2" - 2" valves
with Flanged Body, Spigot Body or True Union style Socket &
Threaded ends or Optional Special Reinforced (SR) Threads,
and sizes 2-1/2" - 8" with Flanged Body. Polypropylene 1/2"
- 2" valves with True Union style Special Reinforced (SR)
Threaded ends and sizes 2-1/2" - 8" with Flanged Body. True
Union style also available in metric socket and BSP thread sizes
1/2" through 2".
•
True Union Style with Buttress Thread Union Nuts - Mate with Spears
®
True Union 2000 Ball valves and Union 2000 Pipe
Unions.
• EPDM, FKM, or Elastomer Backed (EPDM or FKM) PTFE Diaphragms.
• PVC & CPVC Sizes 1/2" - 2" Pressure Rated to 235 psi @ 73°F, Sizes 2-1/2" - 4" and all Flanged and all PTFE Diaphragm
through 4" Pressure Rated to 150 psi @ 73°F, 6" Pressure Rated to 100 psi and 8" to 75 psi @ 73°F
• Polypropylene Sizes 1/2" - 4" Pressure rated to 150 psi @ 73°F
• Easy-Grip, High Impact Polypropylene Handwheel
• Built-in, Clear-View Position Indicator
• Stainless Steel External Hardware
• Fully Serviceable, Replaceable Components
• Suitable for Vacuum Service (except with PTFE Diaphragms)
• Assembled with Silicone-Free Lubricants (no lubricant in media contact area)
Special Options
• Hypalon
®
(CSM) Diaphragms
• Natural Polypropylene Body
• Electric or Pneumatic Actuation