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Quick closing butterfly valve
Quick - off butterfly valve is mainly used in high safety grade system such as steam turbine extraction pipeline and blast furnace gas residual pressure power generation device
Application
Quick - off butterfly valve is mainly used in high safety grade system such as steam turbine extraction pipeline and blast furnace gas residual pressure power generation device. Suddenly steam turbine load rejection of the steam turbine unit in order to prevent the pressure inside the suddenly drops, inside the exhaust tube and combine each heater in steam turbine caused by more than 3000 turn high-speed rotating turbine blade suddenly reverse operation and cause the turbine blade broken, damaged malignant accident of the steam turbine generator, the used as emergency cut-off valve, there was a crisis situation in the system, It can implement emergency valve closing within 0.3~0.8 seconds to realize reliable cut-off of pipeline.
Characteristic
• The valve uses a three-dimensional eccentric metal seal structure, when closed, the metal sealing ring installed on the valve plate and the tapered body sealing face pressed each other and into a circular contact, open the sealing ring and the seat of the whole sealing face off each other at the same time, that is, instant contact and instant separation. There is no macro friction between the sealing surface, small wear, small opening and closing moment, high sealing accuracy, high temperature resistance, and long service life;
• Butterfly plate laminated composite cone metal sealing surface is composed of several sealing layers, sealing contact part is a cone surface, rather than a line, the first layer sealing failure, as long as the move a little, there are several layers can play a sealing role, to overcome the line sealing in the sealing wear, can not be sealed and leakage shortcomings;
• The hydraulic actuator uses fork drive to push the stem of the butterfly valve to rotate to realize the opening and closing of the valve and adjustment; One end of the transmission box is a hydraulic cylinder control system, and the other end is installed with a reset spring cylinder;
• Hydraulic actuator hydraulic source can be provided by steam turbine anti-fuel oil or hydraulic supply station, according to customer site conditions.
Design Guides
| Design and manufacture | Structure length | Flange connection size | Inspection and test | Pressure and temperature reference |
| NB/T47044 JB/T11490 |
GB/T 12221 | GB/T9124.1、JB/T79、 | GB/T13927 | NB/T47044 GB/T 12224 |
Product Range
| Nominal pressure | PN6～PN63 | |
| Nominal size | DN200～DN2400 | |
| Body matenal | 20、Q235、Q345、WCB、WC6、WC9、CF8 | |
| Test pressure(MPa) | Strength test (Water pressure) | 1.5×P(38℃ pressure rating) |
| Sealing test (Water pressure) | 1.1×working pressure | |
| Applicable Temperature | -29℃～575℃ | |
| Applicable medium | Steam, water | |
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.