Oxygen Butterfly Valve

◆ As the opening and closing device on the oxygen pipeline in the metallurgical industry, the oxygen valve has many particularly strict requirements compared with other general valves. Because oxygen is a flammable and explosive dangerous product, it must be leak-proof, anti-static, and spark-proof to avoid accidents. In terms of structure, the design is: frictionless seal, which effectively reduces the wear of the seal pair, packing wear and upper seal wear; grounding screws are installed on the side flange to avoid static sparks; the exposed part of the valve stem needs to be dust-proof and oil-proof. Butterfly valve has the advantages of good sealing performance, light and flexible operation, safety and reliability, and long service life.

◆ Relevant regulations and standards for oxygen valve design

The design should comply with the "Several Regulations for Oxygen Pipe Networks in Iron and Steel Enterprises" issued by the Ministry of Metallurgy in 1981, as well as the "Oxygen and Related Gas Safety Technical Regulations" (GB16912-1997), "Oxygen Station Design Code" (GB50030-91) and other regulations and standards Requirements.

◆ The maximum flow rate of oxygen in carbon steel pipes should meet the standard requirements.

◆ In order to prevent fire, a section of copper-based alloy or stainless steel pipeline with a length of not less than 5 times the pipe diameter and not less than 1.5m should be connected after the oxygen valve.

◆ Oxygen pipelines should have as few elbows and bifurcations as possible. Oxygen pipeline elbows with working pressure higher than 0.1MPa should be stamped into valve flanges. The airflow direction of the bifurcation head should be at an angle of 45° to 60° with the airflow direction of the main pipe.

◆ In the butt-welded concave-convex flange, the red copper welding wire is used as the O-ring seal, which is a reliable sealing form for the flame resistance of the oxygen flange.

◆ The oxygen pipeline should have a good electrical device, the grounding resistance should be less than 10Ω, and the resistance between the flanges should be less than 0.03Ω.

◆A vent pipe should be installed at the end of the main oxygen pipeline in the workshop to facilitate the purging and replacement of the oxygen pipeline. A filter should be installed before the longer oxygen pipeline enters the workshop regulating valve.

◆ All parts in contact with oxygen should be strictly degreased, and after degreasing, use oil-free dry air or nitrogen to blow clean.

◆ Argon arc welding or arc welding should be used for welding.

◆ The oxygen valve should be opened and closed slowly. The operator should stand on the side of the valve and open it all at once.

◆ It is strictly prohibited to use oxygen to blow the pipeline or use oxygen to test leaks and pressure.

◆ The operation ticket system shall be implemented, and the operation purpose, method and conditions shall be explained and stipulated in more detail in advance.

◆ Manual oxygen valves with a diameter greater than 70mm are allowed to operate when the pressure difference between the front and rear of the valve is reduced to within 0.3MPa.

◆ The oxygen pipeline should be checked and maintained frequently, rust removed and painted, once every 3 to 5 years.

◆ The safety valve and pressure gauge on the pipeline should be checked regularly, once a year.

◆ Perfect the grounding device.

◆ Prior to hot work, replacement and purging should be carried out. When the oxygen content in the blown gas is 18% to 23%, it is qualified.

◆ The selection of valves, flanges, gaskets, pipes, and fittings should comply with the relevant regulations of "Oxygen and Related Gas Safety Technical Regulations" (GB16912-1997).

◆ Establish technical files, train operation, overhaul and maintenance personnel.

◆ Increase the importance of construction, maintenance and operation personnel to safety.

◆ Improve the vigilance of managers.

◆ Improve the level of science and technology.

◆ Continuously improve the oxygen delivery program.

◆ Design: API 609·

◆ Face to face: API609、ISO5752-20、ISO5752-13、DIN F4、EN558

◆ Flange end: ASME B16.5、ASME B16.47、EN1092-1、GOST 12815 、Gost 33259 、MSS SP44

◆ Butt-welding end: ASME B16.25

◆ Test: API598

◆ Fire safe: API607、API6FA

◆ Size: 2”~48”

◆ Class: 150Lb~900Lb or PN6~PN160

◆ Temperature: 100℃~280℃~420℃~600℃

◆ Connection: Double flange、LUG、WAFER

◆ Operation: Worm Gear、Pneumatic actuator

◆ Application: Iron and steel industry, metallurgy, petrochemical, chemical industry

◆ Body: Stainless steel、F304、F316、F321、CF8C、Aluminum bronze、Brass、ASTM A494 M-35-1,UNS N24130、M30C、N06625、Monel 400、Monel K500、INCONEL625, etc.

◆ Disc: Stainless steel、SS304、SS316、 SS321、CF8C、Aluminum bronze、Brass、Monel 400、INCONEL625, etc.

◆ Stem: Monel K500、INCONEL625、C63200、XM-19

Seat: PTFE、RPTFE、MONEL、ASME B564 NO400、C63200、F304、F316、SS+STL、SS+nitriding

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