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LT butterfly valve

26 Oct 2018 10:48:00 browse:16296

Resilient Seated Butterfly Valve

Size Range: 2” – 20” (50mm – 500mm)
Body Style: Lug
Temperature Range: -20°F to 250°F (-29°C to 121°C)
Pressure Ratings: Bidirectional Bubble-tight Shutoff: 250 psi (17.2 Bar)
Dead-End Service Shutoff: 250 psi (17.2 Bar)
Body (CWP): 250 psi (17.2 Bar)
Body Materials: Cast Iron, Ductile Iron
Disc Materials: Nylon 11 Coated Ductile Iron, Aluminum Bronze, Stainless Steel
Stem Materials: Stainless Steel
Seat Materials: Bonded BUNA-N, Bonded EPDM
Applications: High Pressure, HVAC, Dead-End service
  • Details
  • Components and Materials

Series 31H Lug resilient seated butterfly valves are drilled and tapped to meet ASME Class 125/150 and PN16 flanges.

Item Name Material
1 Body Cast Iron
Ductile Iron
2 Disc Aluminum Bronze
Nylon 11 Coated Ductile Iron
316 Stainless Steel
3 Stem 416 Stainless Steel
4 Seat Bonded EPDM
Bonded BUNA-N
Valve Type lug or approved equal.
Body Shall be one-piece lug design with extended neck to allow for 2" of piping insulation.
Flange hole drilling per international flange standard as specified.
A non-corrosive bushing and a self-adjusting stem seal shall be provided.No field adjustment shall be necessary to maintain optimum field performance.
Disc Disc edge and hub on metal discs shall be spherically machined and hand polished for minimum torque and maximum sealing capability.
Stem Shall be one-piece design
Disc to stem connection shall be and internal double "D" design with no possible leak paths in the disc-to-stem connection. External disc-to- stem connections such as disc screws or pins are not allowed.
Stem shall be mechanically retained in the body neck and no part of the stem shall be exposed to the line media.
Seat Shall be tongue-and-groove bonded seat with a primary hub seal and a molded flange O-ring suitable for weld-neck and slip-on flanges.
The seat shall totally encapsulate the body isolating it from the line media and no flange gaskets shall be required.
Testing Valve shall be tested to 110% of the rated pressure.
Valve shall be rated for bubble-tight shut-off at pressure rating shown below.
All Resilient Seated Series 31H valves:
2" - 20" (50mm-500mm) 250 psi (17.2 Bar)
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