stvvalves

 Butterfly valve is a kind of valve which uses round butterfly plate as the opening and closing part and rotates around the valve axis to open, close and regulate the fluid channel. It is mainly used for cutting off and throttling in the pipeline. The butterfly plate of butterfly valve is installed in the diameter direction of pipeline. In the cylindrical passage of the butterfly valve body, the disc-shaped butterfly plate rotates around the axis with a rotation angle of 0 ° C~90 ° C; Between, rotate to 90 ° C, the valve is fully open. Butterfly valve and butterfly rod have no self-locking ability. In order to locate the butterfly plate, worm gear reducer should be installed on the valve rod. Using worm gear reducer can not only make the butterfly plate have self-locking ability, make the butterfly plate stop at any position, but also improve the operation performance of the valve. The streamline design of the butterfly plate can reduce the loss of fluid resistance, so it is an ene...

1, the installation position, height, import and export direction must meet the design requirements, the connection should be firm and compact 0.2), all kinds of manual valves installed on the insulation pipe, the handles must not be downward. 2, the valve must be visually inspected before installation, the nameplate of the valve should comply with the current national standard “General Valve Mark” GB 12220. For valves with a working pressure greater than 1.0 MPa and a shut-off function on the main pipe, the strength and tight performance tests shall be carried out before installation, and shall be used after passing the test. In the strength test, the test pressure is 1.5 times the nominal pressure, the duration is not less than 5 minutes, and the valve casing and the packing should be qualified without leakage. In the rigorous test, the test pressure is 1.1 times of the nominal pressure; the test pressure shall meet the requirements of GB 50243 in the duration of the test, and the...