JB/T 2001.21-1999 This standard is a revision of JB 2021-84 "Type and size of centralized air release valve for hydraulic presses (Pg=315×100000Pa)". This standard specifies the type, size and technical requirements of centralized air release valves for water systems. This standard is applicable to centralized air release valves used in high-altitude and underground working cylinders, pipelines, etc. with a nominal pressure of 31.5MPa and inconvenient to operate during decentralized air release. This standard was first published on January 1, 1984. JB/T 2001.21-1999 Centralized air release valve for water systems (PN=31.5MPa) JB/T2001.21-1999 Standard download decompression password: www.bzxz.net

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Standard of the Machinery Industry of the People's Republic of China
JB/T 2001.1~2001.74—1999
Water system components
Water system assembly and parts1999-06-28 Issued
State Machinery Industry Bureau
2(-01-U1 Implementation
Standard of the Machinery Industry of the People's Republic of ChinaWww.bzxZ.net
Water system
Central air escape valve
Type and size
Watcr system-manifold air-escape-Typenndsize
[PN=31.5 MPa]
Added the type, size and technical requirements of the air release valve used in the water system. JB/T2001.21—1999
Represented 1221—34
Small standard with 31.5MPa, the inconvenience of gas exploration in high altitude underground cylinders, pipelines, etc. The centralized air release valve
? The referenced standards
1 are included in the marked clauses, which constitute the clauses of this standard through reference in this standard. When this standard is published, the full version shown is valid. All standard parts will be revised, and the parties using this standard should discuss and use them as soon as possible. The possibility of a new version of the standard is listed. J2T2001201999 Water System Centralized 1 Air Release Valve Core [PN = 31.5MPa] 3 Types and Sizes
3.1 The standard adopts 014×3m! According to the number of air release valves, there are two types: Type 1: a nested air release valve core [see Figure]: Type 1: a centralized air release adjustment core (Figure 1. 3.2 The size should comply with the provisions of 1 and 1
3.3 Figure 1 + 2! The central air valve core" is in accordance with the provisions of 1B/2001.20. Table
22001.2:.1
J3.T 2001.21.2
China Machinery Industry Bureau approved on 1999-06-28 4
2000-01-1 implementation
4 Technical requirements
1B/2001.21-1999
[-body: 2-centralized venting core; 3-accumulation period connection.1
4.1 Nominal 3].5MPu, test pressure 42MPa. 4.2 The body and the core are tested together to check the valve strength and tightness. The test method is shown in the technical specification of HT2001.20. Example of centralized venting valve: centralized venting type 1 J3/T2001.21-1999
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