Water Transmission
Large-bore mains, pump stations, and reservoir isolation.
Butterfly Valve · Double Flange
Double-flange butterfly valves carry flanges on both ends of a rigid body, giving the disc support and stiffness needed for higher differential pressure and large-diameter transmission mains. Worm gear operators provide the multiplied, self-locking torque these large valves require, with ISO 5211 interfaces and actuator-ready bases for SCADA upgrades.
Application Foundation
A double-flange butterfly valve gear operator supplies the high, self-locking torque required by large rigid-body valves on water transmission and long-span mains. The reinforced double-flange body resists higher differential pressure, so break torque can reach into the thousands of newton-metres and the operator must deliver consistent input across the 90° stroke without back-driving.
Size the operator from the valve break-to-open torque at full differential pressure with a documented safety factor, then match the ISO 5211 flange — commonly F14 to F25 on large bodies. Matson single-stage models M14A–M16 (2,500–4,400 N·m) cover much of this range; two-stage heavy-duty units extend further for the largest mains.
Engineering Data
| ISO 5211 Flange | Typical Valve Size Band* | Common Valve Families | Matson Models Offering This Flange |
|---|---|---|---|
| F05 | Small bore | Ball, plug, small butterfly | M07 |
| F07 | Small–medium bore | Butterfly (wafer), ball, plug | M07, M10 |
| F10 | Medium bore | Butterfly, ball, plug | M07, M10, M12 |
| F12 | Medium bore | Butterfly (lug), ball, gate top-work | M12, M14 |
| F14 | Medium–large bore | Butterfly, trunnion ball, gate | M12, M14, M14A, M15 |
| F16 | Large bore | Butterfly (double flange / AWWA), ball, gate | M14, M14A, M15, M16 |
| F25 | Heavy / large bore | Large AWWA butterfly, high-pressure ball, large gate | M16 |
*Valve size band is indicative only — actual flange depends on the valve manufacturer's top-work, stem, and torque rating. Flange options and Matson single-stage model data are from the Matson worm gearbox catalog (M07–M16, 200–4,400 N·m). Two-stage and electric-actuator series extend up to 160,000 N·m. Confirm the exact flange against your valve datasheet.
| Variant | Actuation | Typical Torque Driver | Mounting Interface |
|---|---|---|---|
| Double flange | Quarter-turn 90° | High ΔP + large disc area | ISO 5211 F14–F25 |
| Large double flange | Quarter-turn (geared) | DN300+ transmission duty | ISO 5211 F16–F25 |
General selection guidance by torque demand and top-flange interface. Match the required break-to-open torque (with safety factor) and the valve top-work flange to a Matson model; exact model and dimensions are confirmed against your valve datasheet — request a datasheet.
Per-model specifications (dimensions, weights, drive bushing details): available on request — request a datasheet. Send your valve tag, bore, pressure class, and required output torque and our engineers return a model recommendation with the matching ISO 5211 interface.
Operation
Use the full design differential pressure for the torque case on transmission mains.
Confirm the larger ISO 5211 flange (F16–F25) and stem interface early — adapters may be needed.
Specify actuator-ready bases where future SCADA or electric actuation is planned.
Engineering
By Industry
Large-bore mains, pump stations, and reservoir isolation.
Circulating- and cooling-water isolation at large diameter.
Penstock and turbine bypass isolation.
Large process and cooling headers.
Manufacturing Partner
Operators sized against real valve torque charts and top-work drawings — not generic catalog tables.
Standard and adapter mounting for current and legacy valve patterns without field rework.
Private label, locked BOM, and volume pricing for valve OEM and distributor programs.
STEP models, center-height tables, and export certificates issued with the commercial quote.
Common Questions
A double-flange butterfly valve has flanged connections on both ends of a rigid body, unlike wafer or lug valves. The double-flange design adds stiffness and disc support for higher differential pressure and large-diameter transmission service, where a worm gear operator supplies the multiplied, self-locking torque needed.
Double-flange butterfly valves are typically large bore and handle high differential pressure, so break-to-open torque exceeds what a hand lever can deliver. A worm gear operator multiplies torque, holds the disc without back-driving, and provides an ISO 5211 base for future electric actuation.
Large double-flange butterfly valves commonly use ISO 5211 F16 to F25 top flanges, matched to the higher torque and larger stem. The exact flange depends on the valve top-work and break-to-open torque; confirm against the valve datasheet and request a datasheet for the operator interface.
A butterfly valve operates by rotating its disc 90° within the bore between open (parallel to flow) and closed (perpendicular). On large double-flange valves a worm gear operator turns the stem through this travel with self-locking, controlled input from a handwheel or actuator.
Match the operator to the valve break-to-open torque at full differential pressure and the ISO 5211 flange (often F14–F25). Matson models M14A–M16 (2,500–4,400 N·m) cover much of the range, with two-stage units for the largest mains. Send your valve datasheet for sizing.
Send your double-flange valve bore, design pressure, and ISO 5211 flange. We size a heavy-duty worm gear operator with documented torque margin and dimensional outline.