The core value of an oxygen-enriched degreasing safety valve lies in the degreasing and cleaning procedures performed during manufacturing that far exceed conventional standards, ensuring all oxygen-contact surfaces meet strict cleanliness requirements.The main safety valve product names of China safety valve Network include:900 DIN Safety Valve,Air Compressor Safety Valve,A69Y Main Safety Valve(W Series) Welding Safety Valve,Anti-sulfur Spring Type Safety Valve,ANSI Bellows Safety Valve,Air, Gas Valve,Ammonia-used Safety Valve,A28X Air Compressor Safety Valve,AD Safety Valve Muffler,Bellows Spring Fall Lift SafetyValve,Built-in Safety Valve,Butterfly Spring Type Safety Valve,Copper Safety Valve,Duplex Safety Valve,Double Lever Safety Valve.

Why Oxygen Safety Valves Must Be Strictly Degreased

Oxygen itself does not burn, but it violently accelerates the combustion of nearly all materials. Residual grease, lubricants, or organic particles inside a safety valve can self-ignite due to friction heat or adiabatic compression when high-pressure oxygen flows through. Tender documents explicitly require that degreasing of oxygen-dedicated safety valves be performed according to the HG20202 specification. In international practice, oxygen cleaning typically follows ASTM G93 or CGA G-4.1 standards, requiring residual oil content below 100 mg/m2 and solid particles below 50 mg/m2.

Key Manufacturing Capabilities and Cleaning Verification

Qualified oxygen safety valve manufacturers must have dedicated cleaning facilities and verifiable testing methods. Cleaning is typically performed in a cleanroom or controlled environment using ultrasonic cleaning, solvent cleaning, or specialized water-based cleaners. Post-cleaning inspection includes white light visual examination and ultraviolet black light inspection, the latter capable of detecting hydrocarbon residue fluorescence as low as 40 mg/m2. Only oxygen-compatible lubricants such as Fomblin or Krytox are permitted during assembly, with strict quantity control. Finished products require double bagging, nitrogen purging, and labeling as Cleaned for Oxygen Service.

Relevant Manufacturers and Supply Capabilities

HEROSE offers a range of brass and 316 stainless steel safety valves available with cleaned for oxygen service configurations, covering cryogenic safety valves and high-pressure relief valves for industrial gas and cryogenic storage applications.

GOETZE produces the 492GOX series designed specifically for oxygen applications, with Monel alloy valve body components to resist oxygen combustion risk. The valves undergo rigorous oxygen pressure impact testing and are suitable for high-pressure oxygen and medical gas systems.

Bray International provides cleanroom services for oxygen valve cleaning according to EIGA 33/18, MSS-SP-138, ASTM G93, and CGA G-4.1 standards. The process includes degreasing, cleaning, drying, dual white light and UV inspection, nitrogen purging, and sealed packaging.

DeZURIK operates a dedicated cleanroom at its Sartell facility, performing oxygen service cleaning per MSS-SP-138. After cleaning, white light and UV black light inspections are conducted, and valves are double-bagged after secondary pressure testing.

Flow Safe safety valves are degreased and explicitly suitable for oxygen, natural gas, and other flammable gas media.

In China, the Yingkou Xinjing Oxygen Plant specifies oxygen-dedicated safety valves manufactured per JB/T12955 and degreased per HG20202, model Ay42Y-16P DN50 for oxygen-enriched piping. Cixi Fly Pipe Equipment offers the A48Y series stainless steel safety valves suitable for oxygen, gas, and steam media.

Selection Guidelines

The safety of oxygen-enriched degreasing safety valves is built on verifiable cleaning procedures. Selecting manufacturers with cleanroom cleaning capabilities, UV inspection methods, and oxygen-compatible lubricant management systems is key to ensuring system safety. International manufacturers such as HEROSE, GOETZE, Bray, and DeZURIK, as well as domestic suppliers compliant with HG20202 requirements, can provide relevant products. Cleaning compliance documentation should be the core acceptance criterion during procurement.

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