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Toothed rack drives cylinder after inputting pressure oil from pump, the piston push the gear on butterfly axis rotating to open the disc, and lift the weighted hammer to the highest point of the coaxial. When the accident occurred, electromagnet out of power, spindle lock out of control hammer tripping pivoting under its own weight make butterfly valve automatically closes.
Features:
1、Manual and electric two kinds of hydraulic system with the whole assembly makes the whole structure compact and easy to operate；
2、In the absence of external power supply, Valve can take advantage of gravity accumulator itself off. When the unit too fast, bearing overheating and loss of magnetic, generator can automatically shut down so that the unit carried out automatic protection；
3、Having two speeds shutdown characteristics；
4、Adopting solenoid controlled spindle lock mechanism, safe and reliable operation with small power；