Eight character blind board

The eight character blind plate, as the name suggests, is shaped like an eight character. One end is a blind plate, and the other end is composed of a throttle ring. When transporting fluids, the throttle ring is used, and when cutting off, the blind plate is used. It has a similar function to a shut-off valve, and can be used to cut off when the valve leaks. Its sealing performance is relatively good. For systems that require complete isolation, it is generally chosen as an excellent isolation method. There should be two shut-off valves before and after the eight character blind plate, and when both are in the closed state, switch the eight character blind plate status. Common heat exchanger operation and standby, reactor operation and standby, nitrogen pipeline and process pipeline connection, etc. Another characteristic is clear labeling, making it easy to identify its installation status

Flanges can be divided into carbon steel according to their manufacturing materials: (20 #, A3, Q235, Q23 excellent, Q235B, 20G, 16Mn, Q345, Q345R, ASTM A234WPB, ASTM A105, etc.); Stainless steel: (304, 304L, 316, 316L, S30408, S30403, S31608, S31603, SUS304, ASTM A403, TP321, TP317L, 347, 0Cr18Ni9, 00Cr19Ni10, 00Cr17Ni14Mo2, 1Cr18Ni9Ti, 06Cr17Ni12Mo2, 022Cr17Ni12Mo2, etc.); Alloy steel: (16MnR, Cr5Mo, 12Cr1MoV, 10CrMo910, 15CrMo, 12Cr2Mo1, A335P22, St45.8/III, A10bB, etc.); Special alloy steel: (TP310S, 904L, Incoloy800, Incoloy825, Incoloy600, Incoloy625, etc.); Dual phase stainless steel: (F51, S31803, S2205, F53, 2507, S32750, F55, 2607, S32760, etc.)

Common types and codes of flanges: 1. PL plate flat welding flange, 2. SO neck flat welding flange, 3. WN neck flat welding flange, 4. SW socket welding flange, 5. Th threaded flange, 6. BL flange cover, 7. Eight shaped blind plate, 8. PJ/SE neck welding ring loose flange, 9. PJ/PR flat welding ring loose flange, 10. reducing flange, 11. stainless steel flange, 12. pressure vessel flange, 13. American standard flat welding flange, 14. American standard SO neck flat welding flange, 15. American standard WN neck welding flange. Common sealing surface form codes for flanges: protruding surface RF. Concave FM, convex M, tenon T, groove G, full plane FF, ring connecting surface RJ

Common execution standards for eight character blind plates: The current flange standards in China are divided into two systems, namely PN series (European system) and Class series (American system). The pressure markings specified in this standard are divided into PN markings and Class markings. The PN label has 12 pressure levels, namely: PN2.5; PN6; PN10; PN16; PN25; PN40; PN63; PN100; PN160; PN250; PN320; PN400。 The Class label has 6 pressure levels, namely: Class 150; Class 300; Class 600; Class 900; Class1500; Class 2500。 The implementation standards include GB series (standard), JB series (mechanical department), HG series (chemical department), ASME B16.5 (American standard), BS4504 (British standard), DIN (German standard), JIS (Japanese standard)

Standards: GB/T9112-2010, GB/T9119-2010, GB/T9116-2010, GB/T9115-2010

Chemical Department Standards: HG/T20592-2009, HG/T20615-2009, HG5010-52~HG5028-58, HGJ44-91~HGJ65-91, HG20592-97

American Standards: ASME B16.5, ASME B16.47

Mechanical Department Standards: JB81-59~JB86-59, JB/T79-94~JB/T86-94, JB/T74-1994

Pressure Vessel Standards: NB/T4702-2012, NB/T47021-2012

JB/T4701), NB/T47022-2012 (JB/T4702), NB/T47023-2012 (JB/T4703), NB/T47024-2012 (JB/T4704)