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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 |
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. |
Pressure Ratings |
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) |