Gauge needle valve is an important part of instrumentation piping system, there are stop valve and ball valve, its function is to open or cut off the pipeline access. Needle-shaped stop valve good sealing, long service life, even if the sealing surface is damaged, only need to replace the vulnerable parts, you can continue to use. Needle valve installation should pay attention to the flow direction of the medium and the body of the arrow on the same direction. Needle Valve Standard and Application Specification Standard Item Standard No. Standard Name Application Standard (American Standard) Design and Manufacture Standard JB / T 7747-1995 Needle Stop Valve ASME B16.34-1996 Flange, Thread and Weld Connecting Valve JB / T 8473-1996 Instrumentation valve group JB / T3595-2002 General requirements for power station valves GB / T1224-1989 General requirements for steel valves GB / T12235-1989 Universal valves Flanged steel stop valve and lifting check valve Structural length Standard GB / T15188.1-1994 Length of the valve structure welded butt joint valve ASME B16.10-1996 Length of the valve structure GB / T15188.3-1994 Length of the valve structure Female thread connection valve GB / T15188.4-1994 Length of the valve structure Female thread connection valve GB / T Flange connection check valve and check valve (through valve) Structure length JB / T Reduced diameter forged steel gate valve, stop valve, throttle valve, check valve structure length Connection Standard JB / T 1751-1992 forged steel valve socket weld connection end size ASME B16.11-1991 JB / T 1752-1992 Forged steel valve threaded end size ANSI B16.25-1991 Material Standard JB / T 5300-1991 General purpose valve materials Technical requirements for plain forgings ASTM A105-1991 Standard for inspection and test of normative valves forged or rolled steel tubes forgings or valves, fittings and parts for high temperature GB / T Common valve pressure test JB / T 9092-1999 Valve Inspection and Testing API STD 598-1996 Valve Inspection and Testing Other Standards GB / T Common Valve Signs
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