1. Brief introduction of Butterfly Type Non-return Valve
  This product adopts wafer connection, compact structure, the valve flap do the lifting movement along the center, due to the closure of the valve flap is short, and spring-loaded, closing is very fast, can significantly reduce the water hammer phenomenon. The product has the characteristics of small volume, light weight, flexible action, reliable sealing, convenient installation, especially suitable for occasions with restricted installation space, suitable for water, steam, oil, nitric acid, acetic acid, strong oxidizing medium and other media.
2. Material of Butterfly Type Non-return Valve:
| Item | Description | Available Materials |
| 1 | Body | WCB; Grey cast iron GG25; Ductile iron GGG40; CF8M |
| 2 | Spring | Stainless steel 316 |
| 3 | Door | Stainless steel 316,304; Al.Bronze; Carbon steel |
| 4 | Lifting Eye Bolt | Â Steel |
| 5 | Seat Gasket | BUNA-NÂ Â RESILIENT SEAT MOLDED TO BODY |
| 6 | Hinge pin | Stainless steel 316 |
| 7 | Stop pin | Stainless steel 316 |
| 8 | Gasket | Teflon |
| 9 | Stop pin retainer | Â Steel |
| 10 | Hinge pin retainer | Â Steel |
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