Lug Butterfly Valve

The Lug Butterfly Valve made in China JOEPAI factory adopts a protruding flange connection structure, with threaded ear holes on both sides of the valve body, which can be disassembled and maintained separately at both ends of the pipeline.

It is suitable for systems that require end closure or dead end operation scenarios. Compared to butterfly valves, the lug design provides higher structural strength and installation flexibility, and is widely used in industries such as petrochemicals, power plants, water treatment, papermaking, food, and pharmaceuticals.

Installation and Maintenance

1. During installation, the valve disc should be stopped in the closed position.
2. The opening position should be determined according to the rotation angle of the butterfly plate.
3. Lug Butterfly Valves with bypass valves should be opened before opening.
4. The installation should be carried out according to the manufacturer's installation instructions. For heavy butterfly valves, a solid foundation should be set up.

Key Points for Construction

1. The installation position, height, and import/export direction must meet the design requirements, and the connection should be firm and tight. All types of manual valves installed on insulated pipelines must not have handles facing downwards.
2. Before installing the valve, a visual inspection must be conducted, and the valve nameplate should comply with the current national standard "General Valve Marking" GB 12220. 

For Lug Butterfly Valves with a working pressure greater than 1.0 MPa and a shut-off function on the main pipeline, strength and tightness tests should be conducted before installation, and they can only be used after passing the tests. During the strength test, the test pressure shall be 1.5 times the nominal pressure, and the duration shall not be less than 5 minutes. The valve shell and packing shall be qualified if there is no leakage.

During the tightness test, the test pressure is 1.1 times the nominal pressure; The test pressure should meet the requirements of GB 50243 standard for the duration of the test, and it is considered qualified if there is no leakage on the sealing surface of the valve disc.