The butterfly plate of the wafer lug butterfly valve is installed at the cross section of the pipeline. In the cylindrical channel of the butterfly valve body, the disc-shaped butterfly plate rotates around the axis, and the rotation angle is between 0°and 90°, and the valve is fully open when it rotates to 90°.

Structure of lug type butterfly valve

The lug type butterfly valve is connected between two pipeline flanges with double-headed bolts. Its structure is simple, small in size and light in weight, and consists of only a few parts. And it can be opened and closed quickly by just rotating 90°, which is easy to operate, while the valve has good fluid control characteristics. When the butterfly valve is in fully open position, the thickness of the butterfly plate is the only resistance when the medium flows through the valve body, so the pressure drop generated through the valve is small, so it has good flow control characteristics. The double-offset butterfly valve has two types of seal, elastic seal and metal seal. For resilient seal valves, the seal can be set on the valve body or attached to the butterfly plate perimeter.

Application of lug type butterfly valve

Butterfly valve is not only widely used in general industries such as petroleum, gas, chemical, water treatment, etc., but also used in cooling water system of thermal power station.

Used for gas pipeline in sulfuric acid industry: furnace front blower inlet and outlet, relay fan inlet and outlet, electric mist elimination tandem and coupling valve, S02 main blower inlet and outlet, converter regulation, preheater inlet and outlet, etc. to regulate and cut off gas volume use.

It is used for sulfur burning, conversion, dry suction section in sulfur acid system, and is the preferred brand of valve for sulfur acid device, and is considered by the majority of users as a butterfly valve with good sealing performance, light operation, vice corrosion, high temperature resistance, easy operation, flexibility, safe and reliable use, and has been widely promoted and used.

Lug type butterfly valve is also widely used in: chemical, petrochemical, smelting, pharmaceutical, food and other industries in SO2, steam, air, gas, ammonia, CO2 gas, oil, water, brine, lye, seawater, nitric acid, hydrochloric acid, sulfuric acid, phosphoric acid and other media in the pipeline as a regulating and intercepting device use.

Structural features of lug type butterfly valve

①The unique design of three-way eccentric makes the sealing surface frictionless between the transmission, which prolongs the service life of the valve.

②Resilient seal generated by torque.

③The ingenious wedge design makes the valve have the automatic sealing function of tightening the more it is closed, with compensating and zero leakage between the sealing surfaces.

④Small volume, light weight, light operation and easy installation.

⑤Pneumatic and electric devices can be configured according to user requirements to meet the needs of remote control and program control.

⑥Change parts material can be applied to various media, and can be lined with anti-corrosion (lined with F46, GXPP, PO, etc.).