Electric Wafer Butterfly Valves

Commercial HVAC & Chilled Water Class

Engineered for central chiller plants, air handlers, and boiler circulation loops (DN50 to DN300 / 2" to 12"). High-grade vulcanized EPDM rubber liners cushion polished 316 stainless steel or nickel-plated ductile iron discs, delivering low operating torque and smooth 4–20mA proportional water balancing.

• Universal wafer locating lugs align smoothly with ASME 150# and DIN PN16 flanges
• Compact profile cuts valve installation depth by up to 60% compared to flanged valves
• Direct-mount ISO 5211 platform eliminates bracket deflection and hysteresis

Industrial Utility & Water Treatment Class

Built for municipal pump houses, filtration skids, and industrial wastewater headers (DN50 to DN600 / 2" to 24"). Heavy-wall ductile iron body with electrostatic fusion-bonded epoxy (FBE) coating protects against moisture, groundwater, and aggressive atmospheric corrosion.

• Field-replaceable cartridge seat with molded phenolic backing ring
• Full-boot rubber face functions as an integral flange gasket
• Bidirectional zero-leakage shut-off up to 16 bar (230 psi) working pressure

Ultra-Compact Face-to-Face

Manufactured strictly to EN 558 Series 20 / ISO 5752 short dimensions. Requires only a fraction of the pipeline length of gate or flanged valves, making it ideal for tight mechanical rooms and crowded skid manifolds.

Universal Flange Compatibility

Engineered with external locating lugs that fit smoothly between ASME B16.5 Class 150, EN 1092-1 PN10/PN16, and JIS 10K flanges, guaranteeing perfect concentric bore alignment during bolt tightening.

Full-Boot Integrated Flange Gasket

The resilient rubber liner extends completely over the outer body faces. Functions as an integral flange gasket, eliminating the need to purchase separate pipe gaskets and preventing fluid contact with the metal body.

50% Lighter Pipeline Load

By eliminating heavy bolted flange necks, body mass is reduced by nearly half compared to flanged valves. Reduces structural pipe hanger loads, simplifies overhead rigging, and cuts international freight costs.

Bracketless Direct-Mount ISO 5211

Features an integrated elevated ISO 5211 mounting pad. Electric actuators bolt directly onto the valve neck without brackets or adapters, keeping stack height low and eliminating angular backlash during automated cycling.

Energy-Efficient Motorized Actuation

Low disc friction ensures minimal electrical operating power. Paired with compact IP67 actuators offering fast 10–20s quarter-turn strokes, visual position dome, manual override, and 4–20mA proportional modulating options.

1. How is a wafer butterfly valve installed between pipeline flanges?

A wafer butterfly valve is inserted directly between two existing pipeline flanges. Long all-thread studs or through-bolts span the entire length between the two pipe flanges, passing through the valve's external locating holes. As bolts are tightened crosswise, the pipe flanges compress the valve's rubber liner faces, creating a tight seal without needing separate flat gaskets.

2. What is the difference between a wafer butterfly valve and a lugged butterfly valve?

• Wafer Style: Uses through-studs clamping between two flanges; lighter and more economical, but cannot be used for dead-end service (removing downstream pipe releases the valve).

• Lugged Style: Features individual threaded holes that bolt independently to each pipe flange, allowing downstream piping to be removed while the valve holds full upstream pressure.

3. Why does the valve disc extend beyond the body face in open position?

To achieve an ultra-short face-to-face length, the body is narrower than the disc diameter. When fully opened (90°), the disc edge protrudes slightly past the body faces into the adjacent pipe. Piping designers must ensure that adjacent pipe inside diameters and thick-wall plastic liners do not mechanically interfere with disc rotation.

4. Can wafer butterfly valves be used for HVAC modulating chilled water control?

Yes. DELCO wafer butterfly valves paired with 24V or 220V proportional electric actuators (accepting 0–10V or 4–20mA BMS signals) provide highly accurate chilled and condenser water flow throttling between 20° and 70° disc opening angles, offering an economical, high-capacity alternative to heavy globe control valves.