non-standard flap valve
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Round Casting Iron Prevent Backwater Flow Non-standard Flap Valve
Cast iron square falp gate valve with round type, metal seat, non-return, flange end falp valve, produce process is casting, with the below a advantage 1. More energy-saving (such as opening and closing the door without manual application of external force) 2. Long service life (simple mechanical structure, convenient maintenance) 3. Convenient to use (switch does not require manual operation)
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