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Thermoplastic Valves Product Guide & Engineering Specifictions
Polypropylene Butterfly Valves
Page 785 Suitable for Oil-Free air handling to 25 psi, not for distribution of compressed air or gas Spears
®
Manufacturing Company
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Features
Spears
®
patented Butterfly Valve design departs from
traditional liner-seat type valve to eliminate seat creep, reduce
operating torque and provide positive seal-off. Broad range
of chemical resistance makes Polypropylene well suited for
industrial and chemical processing applications. Designed
for flow control or throttling, this high-performance valve is
offered with a full variety of options for greater application
versatility. Available in IPS sizes 1-1/2" - 24" with custom
produced 30" to 60" valves available.
•
UV Stabilized Polypropylene Construction
• Special off-set Disc lifts quickly from seat to reduce wear
and reduce operating torque.
• Patented Limited Contact Seat design provides free
travel - eliminates seat creep, extrusion and wear. Field
replaceable without full valve disassembly.
• Interlocking Body & Seat prevents wash-out or blow-out.
• Buna-N, EPDM or FKM Seat & Seals
• Solid Type 316L Stainless Steel Stem, fully isolated from
process fluids
• Reversible High Impact Polypropylene Lever Handle with
7-Position stops & Built-in Lockout (standard handle on
1-1/2" - 8" valves; not available on 10" & larger valves)
• High Efficiency Gear Operator with Cast Aluminum
Housing, Polypropylene Handwheel, and Built-in Position
Indicator (available for all sizes; standard on 10" & larger
valves)
• Pressure ratings include Dead-End Service (See Chart).
• ANSI/ASME B16.5 Class 150 Bolt Pattern
Optional Accessories
• PTFE Coated Stem
• Stem Extension Kit
• PTFE Seat Sleeve (through 12" size)
• Lever Handle Kit (standard on 1-1/2" - 8" valves)
• Gear Operator Kit (standard on 10" & larger valves)
• T-Handle Kit
• Speed Handle (for gear operated valves)
• 2" Square/T-Style Operator Nut (for gear operated valves)
• Chainwheel Operator Kit (for gear operated valves)
• Positive Stem Stop (for gear operated valves)
• Submersible Gear Operators
* See “BUTTERFLY VALVE ACCESSORIES” section for details of individual products.
Sample Engineering Specification
All thermoplastic valves shall be Butterfly type constructed
from Polypropylene, ASTM D 4101. All valve seats and
O-rings shall be Buna-N, EPDM or FKM. Seat shall be a
non-liner type interlocked to valve body. Bolt hole pattern
shall conform to ANSI/ASME B16.5 Class 150. Disc shall
be offset design with fully isolated, Type 316L stainless steel
stem and Type 316 stainless steel hardware. Lever operated
valves shall be equipped with high impact polypropylene
handle having built-in lockout capability. Gear operated
valves shall be equipped with position indicator and high
impact polypropylene handwheel. Valves shall be pressure
rated at [see table] for water at 73°F, as manufactured by
Spears
®
Manufacturing Company.
Material Note: UV Stabilized Polypropylene with beige pigment sizes 1-1/2" - 12"
are glass reinforced, sizes 14" - 24" are not.
Polypropylene