... Machining Part1.product information(1) CNC Precision Machined valve parts(2) OEM Service Based on Drawings or ... Company Name: Qingdao Zehan Machinery Manufacturing CO., Ltd.(2) Main products: CNC machining precision parts: brass valve parts, brass pipe fittings, ... inspection devices: digital projector, Rockwell hardness tester, hydraulic valve test bench, micrometer, thread ring gauge and plug gauge ...