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A28W Male Threaded Brass Safety Valve

A28W Male Threaded Brass Safety Valve

  • Model:A28W-16T/A28W-25T / A28W-40T
  • Specification:DN15-DN80
  • Temperature:≦200℃
  • Medium:Water, oils, steam, gases, and corrosive media.
  • Pressure:16PN-160PN
  • Connection method: external thread
  • Driving method:spring type
  • Material:copper
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A28W Male Threaded Brass Safety ValveOverview

A28W male copper safety valve is a spring micro-opening safety relief valve with brass body and male interface. When the pressure in the protected small system or equipment exceeds the preset safety value, the valve will open automatically to release the medium and close automatically after the pressure returns to normal. W "means that the sealing surface is directly machined from the valve body material. Brass material ensures good corrosion resistance and thermal conductivity. The external thread connection is easy to install, and the overall structure is compact. It is specially designed to provide economical and reliable safety protection for low pressure and small-diameter non-corrosive medium systems. It is mainly installed on low pressure (generally ≤ 1.0MPa) pipelines or equipment such as small electric water heater, steam generator, coffee machine, small pressure vessel, compressor air storage tank, laboratory equipment and HVAC system, as the final safety protection device to prevent overpressure due to pressure control failure.

A28W Male Threaded Brass Safety Valve Product Diagram

A28W Male Threaded Brass Safety ValveCharacteristic

1.Brass body corrosion resistant

The valve body is made of brass, which has good corrosion resistance to water, steam, air and various non-corrosive media and is suitable for living and general industrial environment.

2.Easy external thread connection

The inlet end is a standard male thread (usually G1/2 ", G3/4"), which can be directly installed on the threaded interface of the equipment or pipeline. It is easy to install and remove without additional flange connection.

3.Spring micro-opening structure

Direct load spring and micro-opening valve flap design is adopted, with small opening height, moderate discharge and fast opening and closing. It is applicable to liquid or occasions requiring small discharge for pressure relief.

4.Body sealing surface ("W" type)

The sealing surface of the valve flap and the valve seat is directly machined from the brass material of the valve body, which is economical and practical, and can meet the sealing requirements of conventional working conditions.

5.Compact structure and wide applicabilityThe overall design is compact and typically has a manual test lever to check disc flexibility periodically. Suitable for various systems with relatively low operating temperatures and pressures.      

A28W Male Threaded Brass Safety Valvestructure principle

A28W Male Threaded Brass Safety Valve Structural Diagram

Part Name Material

NO零件名称 Part Name材料 Material
1阀 体 BodyZHPb59-1
2阀 瓣 DIscZHPb59-1
3阀 杆 stem45#
4阀 壳 clackHT200
5调节螺丝 regulating screwHPb59-1
6罩 壳 Housing of housingHT200
7拉 手 Pull handleA1/HT200
8弹 簧 Spring50CrVA


A28W Male Threaded Brass Safety Valvetechnology parameter

Performance Specifications Table

公称压力 (MPa)Nominal pressure (MPa)试验压力 (MPa)Test pressure (MPa)整定压力 (MPa)Set pressure (MPa)
1.62.40.84/1.05/1.37


A28W Male Threaded Brass Safety Valvestandard size

Standard requirements for external dimensions

Design and Manufacturing Standard: GB/T 12243-2005

Structural length standard: GB/T 12221-2005

Connection flange standard: GB/T 9113

Pressure and temperature rating: GB/T 12224-2005

Test and Inspection Standard: GB/T 13927-2008

A28W Male Threaded Brass Safety Valve Outline Drawing


Dimension Chart

公称通径 (DN)Nominal diameter(DN)管螺纹 (R)Pipe thread(R)管螺纹 (G)Pipe thread(G)尺寸(mm)Size
d0HL1LS
151/2”3/4”10188553730
203/4”1”14215664234
251”1 1/4”17240764540
321 1/4”1 1/2”2026786.55548
401 1/2”2”25298976756
502”2 1/2”323051087066
652 1/2”3”403591138486
803”3”503841268498