1、 Purpose:
The hydraulic extraction check valve is installed in the extraction horizontal pipeline led out from the low-pressure steam guide pipe of the steam turbine, mainly to prevent the backflow of steam in the extraction pipeline or in case of accidents, which may cause overspeed of the steam turbine.
2、 Characteristics
1. The valve plate adopts a large oblique angle to shorten the opening and closing stroke, and the hydraulic assisted closing achieves fast opening and closing. The three-dimensional eccentric sealing structure separates when the seal is opened and seals when the contact is closed, making opening and closing lightweight and flexible. (≤ DN250 adopts cut-off type)
2. The valve plate is assisted by the closing thrust to achieve the purpose of cutoff and check.
3. The fast closing time can reach 0 5~1 second, emergency shutdown is safe and reliable.
3、 Technical requirements
1. Hydraulic source interface: RC1/2
2. Hydraulic cylinder operating pressure: 2.0 MPa
3. Emergency cut-off time; 0.5-1 second
4. Connecting flange: JB/T79-94 GB/9113.2000
5. Structural length: GB 12221-89
6. Power supply voltage: AC220-DC24V (specify when ordering)