Pilot valve casting and casting technique thereof

Abstract

The invention discloses a pilot valve casting comprising a valve main body and a valve base. The valve main body is in a cylinder shape, and the valve base is square; the valve main body is internally provided with flow passes, the flow passes comprise the upper flow pass and the lower flow pass, and the upper flow pass communicates with the lower flow pass; the upper flow pass comprises a first flow pass body, a second flow pass body, a third flow pass body, a fourth flow pass body and a fifth flow pass body; and the first flow pass body communicates with the second flow pass body, the fourth flow pass body and the fifth flow pass body, and the second flow pass body communicates with the third flow pass body, the fourth flow pass body and the fifth flow pass body. The invention further discloses a casting technique of the pilot valve casting. According to the pilot valve casting, structures of the flow passes and flow pass ports and the diameters of the flow pass ports are reasonably designed, and the casting has the advantages of being high in integrated level, high in reliability and long in service life. Through the casting technique of the pilot valve casting, air holes and bubbles in the casting process are reduced, and the qualification rate of the casting is greatly increased.

Description

technical field [0001] The invention relates to a valve body casting, in particular to a pilot valve casting and its casting process. Background technique [0002] With the development of industrial technology, hydraulic control systems are more and more widely used in mechanical control and industrial valves. Pilot valve castings, as the basic components of automation to control fluid direction, have the advantages of high integration, high reliability, and long life. Their performance and life largely determine the stability and working capacity of the entire hydraulic system. [0003] The existing pilot valve castings have the following disadvantages: the sand core in the middle of the casting mold generates a large amount of gas during the preparation process, and the sand core cannot be exhausted in time, resulting in many pores on the pilot valve casting, resulting in a casting rejection rate of up to 70%; on the other hand , because the flow channel of the pilot valv...

AI Technical Summary

Problems solved by technology

[0003] The existing pilot valve castings have the following disadvantages: the sand core in the middle of the casting mold generates a large amount of gas during the preparation process, and the sand core cannot be exhausted in time, resulting in many pores on the pilot valve casting, resulting in a casting rejection rate of up to 70%; on the other hand , because the flow channel of the pilot valve casting is too small and the structure is complex, the gas in the sand core is not removed smoothly during the pouring process, and the smaller sand core is easily broken under the action of molten iron pouring and high temperature

Images