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Home/Products/BW / BL Series
BW / BL SERIES

Butterfly Valve
Wafer & Lug Type

A bi-directional, zero-leakage butterfly valve with a "Double-D" stem drive for minimal play and accurate dual-stem sealing — in wafer (BW) and lug (BL) body styles, hand lever, gear or pneumatic actuator operated.

DN40–DN300PN06 / PN10 / PN16API 609ISO 5211 Actuator Pad
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UFlow BW Series wafer type butterfly valve
Size RangeDN40–DN300
End ConnectionWafer (BW) / Lug (BL)
Pressure RangePN06 / PN10 / PN16
Leakage Class100% Bubble-Tight
Model Information

Wafer Type & Lug Type

Wafer type mounts between flange bolts for compact installation; lug type carries its own threaded lugs for dead-end service.

End Connection
Wafer — API 609 (CAT A)
Size
DN40–DN300
Suitable Flange
ASME B16.5 150#
Pressure Range
PN06, PN10, PN16
Standard
API 609, BS 5155, ISO 5211, API 598, ASME B16.5
Body Material
Cast Iron (CI), SGI, WCB, CF8, CF8M
Disc / Stem Material
SGI/CF8/CF8M/WCB  |  SS410/SS304/SS316
Seat Material
NBR, EPDM, VITON
Operator
Hand Lever / Gear / Pneumatic Actuator
SizeActuator (Double Acting)Mounting Flange
40–80 mmAD-50F05
100 mmAD-63F07
125–150 mmAD-80F07
200 mmAD-100F07/F10
250 mmAD-125F07/F10
300 mmAD-150F12
100% tested with pneumatic and fluid (water) media before dispatch. Full dimensional and torque data available on request.
End Connection
Lug — threaded lugs, dead-end service rated
Size
DN40–DN300
Pressure Range
PN10, PN16
Standard
API 609, BS 5155, ISO 5211, API 598, ASME B16.5
Body Material
Cast Iron (CI), SGI, WCB, CF8, CF8M
Seat Material
NBR, EPDM, VITON
Operator
Hand Lever / Gear / Pneumatic Actuator
Lug body allows one side of the line to be unbolted and removed while the valve remains installed and holds pressure on the other side — ideal for branch isolation.
Why BW / BL Series

Bi-Directional, Zero Leakage

  • "Double-D" stem drive — extremely small stem/disc play
  • Accurate dual stem sealing prevents leakage
  • 100% tightness at full differential pressure
  • ISO 5211 operator flange — direct UFlow AD/AS actuator fitment
  • Mounts per ASME B16.5, face-to-face per API 609 CAT A
Choosing Wafer vs Lug

Which Body Style?

Choose BW (wafer) for the most compact, cost-effective in-line installation between two flanges. Choose BL (lug) when you need to isolate and remove downstream pipework without depressurising the upstream line.

Water TreatmentHVACProcess IsolationUtility Lines
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Ball valve vs butterfly valve guide

Ball vs. Butterfly Guide

Which isolation valve to choose, and when.

Read Guide →

Isolating a large-bore line?

Tell us your line size, pressure class and operator preference and we'll confirm the right BW/BL configuration.

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