Weco® butterfly valves offer the ultimate in dependable, economical flow control. These field-proven valves are available from stock in 2 through 24-inch sizes and can handle working pressures up to 175 psi. For pressure ratings from 176 psi up to 285 psi, consult factory. Wafer, notched, and lug-type body styles meet requirements for new or existing flowline systems. Using a variety of materials, valve bodies, discs, stems, and seats can be individually matched to specific operating conditions, including temperature range, type and concentration of fluid, and various flow conditions. All materials meet ASTM and AISI standards.
Weco® Butterfly Valve Features and Benefits
Standard Materials of Construction
|
Valve Part |
Standard Material |
Optional Materials |
|
Seat & O-ring |
Nitrile (Buna N) (-20° F to 200°F) |
Hypalon®, Teflon®, Viton®, EPDM, Red Natural Rubber |
|
Body |
Ductile Iron |
Aluminum, Steel, Stainless Steel |
|
Stem (upper & lower) |
410 Stainless Steel |
316 Stainless Steel |
|
Disc |
Ductile Iron |
Aluminum Bronze, 316 Stainless Steel, Ryton®, Kynar®, Halar, Teflon® Coated, Nickel Plated, Hastelloy® |
|
Spirol/Retainer Pins |
302 Stainless Steel |
|
Weco® Butterfly Valves Categories:
Model 12
Short neck, wafer body; 175 psi cold working pressure, 2 to 12-inch sizes; 150 psi cold working pressure, 14 and
16-inch sizes
Recommended service:
General on/off and throttling services from 1mm Hg absolute vacuum to full working pressure
Features: Valves are self-centering and mount between 125 or 150 lb ANSI flanges
Model 12N
Short neck, notched body; 175 psi cold working pressure, 2 to 6-inch sizes
Recommended service:
General on/off and throttling services from 1mm Hg absolute vacuum to full working pressure
Features: Valves are notched to fit between lightweight flanges
Model 22
Long neck, wafer body; 175 psi cold working pressure, 2 to 12-inch sizes
Recommended service:
General on/off and throttling services from 1mm Hg absolute vacuum to full working pressure
Features: Valves are self-centering and mount between 125 or 150 lb ANSI flanges, Long neck allows for pipe insulation
Model 22L
Long neck, lug body, 175 psi cold working pressure, 2 to 24-inch sizes
Recommended service:
General on/off and throttling services from 1mm Hg absolute vacuum to full working pressure
Features: Tapped lugs allow independent upstream or downstream bolting to 125 or 150 lb ANSI flanges, Long neck allows for pipe insulation
Download FMC Weco® Butterfly Valve Catalog for more details and specifications.
Operators and Actuators:
Pneumatic Actuators
Double-acting or fail-safe spring return; 2 through 12-inch valve sizes
Recommended service:
Pneumatic actuator for on/off valve operation
Features: Mounts directly to Weco butterfly valves without special adapters or mounting hardware, Full 90° operation with a minimum of 30 psi air, no adjustments required.
Vane Actuator
Quarter-turn, double acting actuator; 2 through 6-inch valve sizes
Recommended service:
Compact, pneumatic actuator for on/off valve operation
Features: The only moving part, the vane, is cast integral to the shaft for sturdiness; does not require field lubrication, fully repairable in-line, Mounts directly to valve in any quadrant.
Gear Operators
Weatherproof, worm gear operator; 2 through 24-inch valve sizes
Recommended service:
Manual on/off or throttling services
Features: Operator has 90° travel arc with internal travel stop screws for a plus or minus 20° adjustment at either end of the travel, mounts on the valve in any quadrant, Chain wheel attachment available, and Hand-wheel shaft extensions available.
Standard Handle
2 through 12-inch valve sizes
Recommended service:
Recommended for 8-inch valves and larger, manual on/off service
Features: Positive-stop gripper with integral locking lug ensures full open/full closed operation; Model 12 and 12N valves have a detent plate which bolts on the valve body in each of four quadrants; Model 22 and 22L valve have a pre-notched top flange with on/off detent positions.
Throttling Handle
2 through 12-inch valve sizes
Recommended service:
Recommended for 8-inch valves and larger, manual throttling service
Features: Notched detent plate and positive-stop gripper with integral locking lug ensures positive locking in any of 10 positions from full open or full closed operation, Detent plate bolts on the valve body in each of the four quadrants.
Download FMC Weco® Butterfly Valve Catalog for more details and specifications.
