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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) | |
