Butterfly Valves
Lug / Flanged / Wafer / Dual Plate
Explore our resilient seated butterfly valves. Lug, flanged, and wafer styles in sizes 2″–36″. Ductile iron construction, designed in accordance with API 609.
PRODUCT RANGE
BUTTERFLY VALVES
Butterfly valves use a quarter-turn rotating disc to control flow, making them a compact, low-torque option anywhere space and actuation simplicity matter more than the fine throttling control of a globe valve. Ladish’s resilient seated butterfly valve line offers three body styles, each suited to a different piping configuration and service requirement.
Lug Style butterfly valves bolt into the line using two sets of flange bolts, allowing either side of the valve to be removed from the pipeline without disturbing the other — useful for isolating a branch or piece of equipment for service. The lug body is also rated for bi-directional dead-end service, so it can seal against a blank flange without a downstream flange bolted in place.
Flanged Style butterfly valves have a full-face body designed to bolt directly between standard flanges, providing a rigid, self-supporting installation for larger lines and higher-cycle applications.
Wafer Style check valves fit between two flanges using through-bolts, offering a lighter, lower-cost option for standard isolation service where dead-end capability isn’t required.
Figure Number
B8L8
Design
MSS SP-67, API 609 Category A
Size
2″ thru 24″
Pressure Rating
150# (200 PSI bi-directional dead-end)
End Connections
Install between ASME Class 125/150 flanges
Materials
Ductile Iron Body (ASTM A536) / Stainless Steel or Aluminum Bronze Disc / Stainless Steel Stem
sEATS
EPDM / NBR, Molded-In Liner
Testing
API 598
Figure Number
B9L5
Design
MSS SP-67, API 609 Category A
Size
2″ thru 24″
Pressure Rating
150#
End Connections
Full-Face Flanged, ASME Class 125/150
Materials
Ductile Iron Body (ASTM A536) / Stainless Steel or Aluminum Bronze Disc / Stainless Steel Stem
SEATS
EPDM / NBR
TESTING
API 598
CONSTRUCTION
ISO 5211 Top Flange for Lever, Gear, or Actuator Mounting
Figure Number
B7L0
Design
MSS SP-67, API 609 Category A
Size
2″ thru 24″
Pressure Rating
150#
End Connections
Install Between ASME Class 125/150 Flanges (Through-Bolt)
Materials
Ductile Iron Body (ASTM A536) / Stainless Steel or Aluminum Bronze Disc / Stainless Steel Stem
SEATS
EPDM / NBR
Testing
API 598
CONSTRUCTION
ISO 5211 Top Flange for Lever, Gear, or Actuator Mounting
Figure Numbers
DUAL PLATE TBD
Design
API 608 and ASME B16.34 and MSS-SP134
Size
½” thru 14”
Pressure Rating
150 thru 600
End Connections
Flanged / Buttweld
Materials
300 Series Stainless / Hastelloys / Monel
Testing
Non Cold Box API 598 / Cold Box Testing MSS-SP134 / BS 6364 (Optional)
butterfly valves
Benefits
Lower Torque, Longer Life — By Design
MOLDED-IN SEAT (Hard-Back Seat Structures): Tightly controlled molding process produces accurate and repeatable dimensions, which leads to consistently lower torques over the valve’s lifetime.
Built to Outlast the Spec Sheet
PRECISION PROFILED DISC SEALING EDGE: Extends the valve life by reducing seat wear.
Drop-In Compatibility, Zero Integration Headaches
ISO 5211 TOP FLANGE: Direct mounting capability between the valve and Ladish valve gears.
Engineered for High-Cycle Reliability
UPPER AND LOWER STEM BEARINGS: Reduce operating torque and increase reliability in high cycle applications.
Full-Pressure Sealing, Even at the End of the Line
END OF LINE CAPABILITY: Lug style valve allows for sealing at full rated pressure even when the downstream flange is removed.
One Valve, Any Flange, No Compromise
ROBUST FLANGE SEALING: Tear-dropped shaped seat face enables tight sealing with a wide variety of industrial flanges.
