Liu Hanwu and others of North China University of Science and Technology studied the stress and strain of two-way cartridge valve under different pressures. The results show that the stress concentration occurs at the outlet side of the two-way cartridge valve.
Wu Hao and Benseddiq Noureddine et al. analyzed the evolution law of semi-elliptical cracks in valves of coal-fired thermal power plant under thermal-mechanical load based on stress intensity factor analysis.
Yadav, Manoj Kumar and others have studied the cause of exhaust valve failure of oil extraction machine. The stress and strain are calculated by ANSYS software. The results show that the maximum stress occurs at the top of the valve; the strength of the valve decreases due to material decarbonization; these two reasons ultimately lead to valve bending failure.
Rykunich, Yu.M. and others have studied the deformation and fatigue cracking of pneumatic solenoid valve under cyclic impact load. The relationship between the number of cycles of valve opening and closing and the cracking is deduced experimentally under different structural materials.Christoph Boes analyzed the stress and deformation of hydraulic valves under high pressure.
In summary, domestic and international research mostly focuses on valve body, design of casting system, stress-strain analysis of valve body and optimization design of valve body based on strength analysis results.Due to the particularity and complexity of hydraulic valve body, there are few reports on the influence of casting defects on valve body strength. This research breaks through the traditional assumption of ideal casting and has important guiding significance for further understanding of valve body strength and reliability design and development of hydraulic valve.