ABSTRACT
This paper introduces the investigation of butterfly check valve with optimum closing performance, which was developed by Shanghai Petrochemical Complex and Tsinghua University for some feed water systems of power plant and Chemical plant. The valve is consisted of valve body, eccentric shaft disk with DN 1200 diameter, governor balance weight hammer and swing damping oil cylinder. All parameters of it have been obtained from optimum -r-t curve for preventing the destruction of systems from waterhammer. The software of optimum calculation has been complied for solving and treating many complex equations and boundary conditions. The paper includes how to determine water impulsive force and momentum on the disk when power fails and pump stops. It is very important and difficult. The experiments of valve turning without the water and valve on industrial systems have been completed and coincide very well with calculation.
