全焊接阀体管线球阀
full welded body pipeline ball valve
变速箱润滑油路安全阀体
transmission lubrication relief valve body
充油安全阀阀芯
charge relief valve poppet
带中心管的全焊接筛管
full weld-on pipe base screen
跨接安全阀体
crossover relief valve body
全焊接板式换热器
All-welded plate heat exchanger
全焊接钢结构
all welded steel structure