instrument valve is made of stainless steel,high pressure and high airproof, precise making,easy to install,reliable quality. SPECIFICATIOND0MLHDN660G1/46585DN1060G1/26887DN1570ZG3/48687DN2080ZG1100100 1. Design & Manufacture According To: GB/T 12224-1989 ; JB/T 7747-1995.2. Connect: Inside and Outside Thread.3. Structure: awl seals; Movable Valve disc.4. Test: GB/T 13927-1992;API 598.5. Material ...