Test Research on Continued Exhaust Fault of Safety Valve Used in Pressure Reducer

Abstract

The integrated pressure reducer used in an oxygen system of certain aircraft has experienced continuous deflation failure of the low-pressure safety valve for many times in the process of use.In order to analyze the cause of the failure,the test is designed and performed according to the configuration and operational principle and analysis of fault phenomenon and fault tree.The test and simulation result show that the damp properties of reducer valve is mismatch with safety exhaust flow is primary reason lead to this fault.Under the large flows condition,the reducer valve will be in the vibrate state which result in the valve worn and lead to the output pressure increases slowly and finally over the open pressure of safety valve.As the exhaust flows of safety valve are more than the rated output flows,reducer valve losses the function of pressure regulation until gas of cylinder is entirely exhaust.The fault can be resolved by changing the damp properties of valve.

Keywords

• integrated pressure reducer
• safety valve
• dynamic properties
• damp properties
• release pressure