Three eccentric hard butterfly check valve is my company set a variety of advanced technology development and the development of a new generation of slow closing check valve. The valve is widely used in metallurgy, hydropower, thermal power, heat, petrochemical, water conservancy, municipal and other industries, the use of independent adjustable hydraulic damping slow closing system for working conditions, pipeline and media parameters of the valve hydraulic damping slow closing The device is adjusted to the best position, installed in the pump outlet and water supply and drainage lines to prevent the media back to prevent water hammer impact, can effectively protect the machine, pump and pipeline safety.