The working principle and construction and installation points of rubber seated butterfly valve

The rubber seated butterfly valve is a kind of valve that uses a circular butterfly plate as the opening and closing part and rotates with the valve stem to open, close and adjust the fluid channel. The butterfly plate of the rubber seated butterfly valve is installed in the diameter direction of the pipeline. In the cylindrical channel of the rubber seated butterfly valve body, the disc-shaped butterfly plate rotates around the axis, and the rotation angle is between 0° and 90°. When it rotates to 90°, the valve is fully open.

Construction and installation points

1. The installation position, height, and direction of import and export must meet the design requirements, and the connection should be firm and tight.

2. For all kinds of manual valves installed on the thermal insulation pipeline, the handle shall not be downward.

3. Visual inspection must be carried out before the valve is installed, and the nameplate of the valve should meet the requirements of the current national standard “General Valve Mark” GB12220. For the valve whose working pressure is greater than 1.0MPa and plays a role in cutting off the main pipe, the strength and tight performance test should be carried out before installation, and it is allowed to be used after passing the test. During the strength test, the test pressure is 1.5 times the nominal pressure, and the duration is not less than 5 minutes. The valve housing and packing should be qualified without leakage. In the tightness test, the test pressure is 1.1 times the nominal pressure; the test pressure should meet the requirements of GB50243 standard during the test duration, and the valve disc sealing surface is qualified if there is no leakage.

Product selection points

1. The main control parameters of the rubber seated butterfly valve are the specifications and dimensions.

2. It can be operated manually, electrically or by zipper, and can be fixed at any angle within the range of 90°.

3. Due to the single shaft and single valve plate, the bearing capacity is limited, and the service life of the valve is short under the conditions of large pressure difference and large flow rate.