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Empty discharge check valve
Empty discharge check valve is also called automatic backflow valve, mainly used at the outlet of water pump, with the pump minimum flow recirculation valve work, to maintain the safe operation of the system
Application
Empty discharge check valve is also called automatic backflow valve, mainly used at the outlet of water pump, with the pump minimum flow recirculation valve work, to maintain the safe operation of the system.
Characteristic
• The lifting and closing of the main valve are linked with the bypass opening, and the bypass flow is automatically controlled to achieve the purpose of energy saving and emission reduction;
• Automatic control, no need for external drive, reduce energy consumption and additional equipment investment, reduce installation and maintenance costs;
• Stable operation of the main pump at low flow;
• The low-flow implementation reduces the occurrence of water hammer in the system and protects the equipment.
Design Guides
| Design and manufacture | Flange connection size | Inspection and test | Pressure and temperature reference |
| NB/T 47044 | GB/T9124.1、JB/T79 | NB/T 47044 | NB/T 47044 |
Product Range
| Nominal pressure | PN160～PN320 | |
| Nominal size | DN50～DN300 | |
| Body matenal | 20、A105、WCB | |
| Test pressure(MPa) | Strength test (Water pressure) | 1.5×P(38℃ pressure rating) |
| Sealing test (Water pressure) | 1.1×P(38℃ pressure rating) | |
| Applicable Temperature | -29℃～570℃ | |
| Applicable medium | Steam, water, etc | |
Note：
1、The valve beyond the above specifications can be customized according to user requirements;
2、The applicable temperature range of each valve shall be subject to the actual pressure bearing material of the valve.