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Uses and characteristics: hand wheel screw type open and close machine widely used in supporting the use of water conservancy and hydropower, thermal power plant, nuclear power plants, municipal environmental protection engineering and strobe, column sewage gate, a filter screen, a checkgate, butterfly valve, gate, to reality canals and pumping station water interception drainage opening and closing. With opening and closing height display, light and flexible hand, locking check, open-air installation, anti-corrosion anti rust force is powerful wait for a characteristic.

Structure principle: the hand wheel type screw opening and closing machine is driven by the rotation of the nut to rotate the nut, the screw up and down, the opening and closing.