The travelling valve of the pump is designed to be closed and opened forcibly, and the pump plunger adopts equal-diameter bare pipe with a floating structure to prevent gas lock and sand sticking.
The structure and structure parameters of the combined valve were designed according to the function claim to the combined valve of the circulate mode sand spraying device.
根据循环式喷砂设备对组合阀的功能要求， 介绍了组合阀的结构和结构参数设计。
3
Compared with large stainless steel valve body in sand casting, it was difficult to control solidification process in investment casting, which results in some defects in the valve body.