The main disc lifts under fluid differential pressure. The handwheel operates the bypass line to adjust bypass flow and the associated pressure condition; it is not the normal drive for the main check disc.
Typical selection options
| Product | JIS 10K Flanged Lift Check Valve with Bypass |
|---|---|
| Nominal size | DN50–DN600 |
| Pressure class | JIS 10K |
| Body material | Cast iron, ductile iron, steel or stainless options |
| Lining / seat | Soft or metal seat options |
| Connection | JIS 10K flanges |
| Operation | Fluid differential pressure; bypass handwheel |
| Temperature | 0–80°C |
| Media | Water and circulation water |
| Design / connection standard | JIS B 2002 / JIS B 2220 |
| Pressure and closure test | JIS B 2003 |
Series reference options, not all possible combinations of size, material, pressure and temperature. Allowable working pressure varies with temperature; select the build when ordering.
Installation and selection
Typical water-service reference: 0–80°C. Select different seals for higher temperatures. Check the flow arrow, installation orientation and bypass connections. Manual bypass adjustment is not automatic constant-pressure regulation.
Purchasing questions
What does the handwheel control?
It adjusts the bypass opening; the main check function remains fluid-operated.
What should an enquiry include?
Size, JIS 10K connections, medium, temperature, pressure, mounting orientation and bypass requirements.
