Butterfly valve of the technical and application of the principle areas
1, Technology
Butterfly Valve by Butterfly valve body, the hydraulic bypass valve joint, a heavy hammer, the release of devices, manual pumps (or electric pumps), rack of electronic transmission and control of the fuel tank, and other parts. Oil from the pressure of imported oil tank rack drive, the piston rack on promoting butterflies My training gear axis of rotation to open the butterfly plate, and coaxial on the move Zhigao Dian weight. Weight on the pallet through the device to release the lock on the spindle axis spindle lock; lock spindle axis fixed by the electromagnet and support up to control the device. When the time of the accident, as part of the electronic control of the movement, electricity electromagnet, the spindle axis lock out of control, a heavy hammer in the role of the self-release under the rotation axis around so that the butterfly valve to close automatically.
The butterfly valve of the hydraulic system, the use of cutting 2 to close the butterfly valve to control the speed at the beginning of the closure of speed in order to reduce the time for Speed and the continued rise in rates; stage after the closure of the slow rate of up to control water pressure.
2, and the technical characteristics of the main technical parameters
2.1 technical features
The whole assembly with a flashlight dual-use hydraulic system so that the whole structure of the compact, easy to use.
In the absence of external power supply, the use of gravity to shut down its own storage. When the unit has been growing too fast, overheated bearings and loss of field when the generator can automatically shut down, which had a crew of the automatic protection.
With a speed of the closure of two properties.
Electromagnet used to control the spindle lock body of a safe, reliable operation and small power.
2.2 The main technical parameters, indicators
D741-10 with a heavy hammer-type butterfly valve, for example, the main technical data: pressure, 1MPa; diameter, φ400, φ500, φ600, φ800, φ1000, φ1200; the use of the highest-head, 100m; the highest step-up head, 145m; open , 5min manual about 1min or so electric; closing time, fast paragraph 5 ~ 10s; slow clearance above 10 ~ 50s; the scope of protection has been growing too fast, 1.8 times the rated speed (adjustable).
3, application specific locations and results
Linhai City, Zhejiang Province, Tan Chai Station Pingyang County, Zhejiang use of hydropower plant equipment, automatic production of two weight-D741X-10 butterfly. Power for the type of hybrid, there is pressure tunnel 1100m, diameter 2.6m, pressure pipe length 50m, diameter 1.2m, design head 45.5m, the highest-head 47m, the design flow 1.8m3 / s, turbine HL220-WJ-50A, power generation Machine SFW-630-6/990 (reactance shunt excitation), rated voltage 400V, rated capacity of 630kW, the rated speed of 1000r/min. Jan 2, 1991 into the big power grid to March 1993, the two machines running together, 7780h. Valve weights running well, the evaluation are as follows: (1) moves in the right equipment to achieve safe production, two open 203 butterfly, to close at 203, 100% accuracy rate movements; (2) the average time to open the electric 55s, Load rejection of fast time set to 5s, to quickly reduce the rate of increase in speed, the rate of increase of 40%, slower clearance time is set to 20s, after the slow rise in water pressure to reduce the rate of increase in the rate at 21 %; (3) stands in the accident in the process of generating units has been growing too fast when more than 1.4 times the rated speed, the device made by the gun so that a heavy hammer into the automatic closure of the release valve to prevent the expansion of the accident, an increase of running a sense of security.
4 Conclusion
First of all, to improve the reliability of the equipment to ensure the safety of the stands. Second, to reduce the labor intensity of workers to run, to reduce the maintenance workload. Two units to reduce the staff on duty 4, the annual savings of about 80,000 yuan.
In addition, the valve in one (less) were on duty and power networks in isolation or in power when the electricity lost when the plant automatically shut down a heavy hammer release, without back-up DC power to operate.
In some of the power plant design, if the unit is scheduled to GD2 hydraulic structures and layout of the conditions, can not find a suitable guide vane closing time to ensure that the unit rate on the rise and water pressure on the appreciation is less than the standard required to allow the value of At this time can be taken to speed weight-2 butterfly valve closed fast to the benefit of reducing the speed increase, after the slow reduction in water pressure can rise. This law set up than the artificial resistance reliable than the surge tank to set the economy.
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