The National Bureau of Quality Supervision and Inspection Center undertook the acceptance of the General Administration of Science and Technology project

[China Instrument Network Instrument Development] Recently, the National Valve Product Quality Supervision and Inspection Center (Fujian) undertook the General Administration of Quality Supervision, Inspection and Quarantine (AQSIQ) scientific and technological planning project “Research on Acoustic On-line Detection Technology of Valve Leakage” successfully passed the review and acceptance of the expert group. The project completed the content and requirements stipulated in the project task book. The workload is saturated. The research results have engineering application value. It has been highly evaluated by the expert group and it is agreed that the technology can be applied and promoted.
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The valve is an important control component in the fluid delivery system and has the functions of cutting off, adjusting, diverting, preventing backflow, regulating, diverting, or overflow and pressure relief. At present, the use of a large number of valves, the valve leakage fault is not easy to be found, there are many high temperature and high pressure, toxic and hazardous, flammable and explosive working media in the petrochemical industry production site, in the event of a leak, it is likely to have a major safety accident.
The project has established a domestic advanced internal leakage testing device for the valve, which can test the sound intensity of various internal leakage conditions of various valves, and adopt multi-physics coupling technology to simulate the modal and flow fields of different internal leakage conditions of various valves. Harmonic field simulation research and analysis, determine the corresponding relationship between sound intensity and endoleak under endoleak conditions, provide guidance for the qualitative and quantitative on-line leak detection of valves, and have important economic and social benefits.
(Original title: The National Bureau of Quality Supervision and Inspection Center undertook the acceptance of the General Administration of Science and Technology project)

Zinc Die Casting Products are a metal forming process in which molten zinc metal is put under pressure and injected into a die.    
Zinc are alloys that have high strength and hardness, outstanding corrosion resistance,full recyclability, mechanical properties, high thermal and electrical conductivity and strength at high temperatures. Zinc alloys possess high dimensional stability for complex shapes and excellent thin walls. The cost of raw material is low.

Zinc Die Casting Products are efficient and economical and offers a wide range of durable shapes and components. Little or no machining is required after a part is die casted, because the process provides very close tolerances for even complex shapes. Zinc Die Castings can also be easily plated or finished. Zinc Die Casting Products are dimensionally stable and heat resistant.


Although this alloy exhibits excellent casting characteristics, it has seen limited use by die casters. It does however possess some interesting characteristics that may be of assistance to designers. Its creep performance is rated higher than the other zinc alloys and it maintains higher strength and hardness levels after long-term aging.
The behavior of zinc alloys under stress is non-linear and time-temperature dependent on strain-rate, i.e. the ratio of stress to strain is not constant, even at low stresses, and varies with time resulting in continuous plastic flow under constant applied load. Designers of structural components should be aware of the creep limitations of zinc alloys, which do not have a single value for elastic modulus or yield strength. Yield strength (allowable stress) under sustained loading is dependent on the allowable design strain (% elongation) over the required service life. Working values for the elastic modulus and yield strength are important for design purposes. Standard engineering formulae used for calculating cross-sections of elastic materials must therefore be used with some caution.
This alloy exhibits excellent damping capacity and vibration attenuation in comparison with Aluminum Die Casting alloys.
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