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.

这种抽油泵柱塞游动阀采用机械强制开启和关闭的结构，柱塞为等径光管、浮动结构，可防止发生气锁游动阀、阀球关闭滞后、砂卡柱塞现象。

youdao

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。

youdao

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.

特大型不锈钢阀体熔模精密铸造与砂型铸造比较，最大的问题是铸件的凝固控制。

youdao