Long distance pipeline of pneumatic valve performance test requirements

long distance pipeline is affected by geographical condition and natural condition, must withstand the climate changes in temperature, the influence of the terrain and earthquake, etc. Therefore, pneumatic valve of long distance pipeline inspection and test is more strict, must carry on the casing strength pressure test, leakage test, performance test, bend test, tensile test and fire test, durability test, etc. , some of the pneumatic valve should also do cold resistant and heat resistant test. Test of pneumatic valves shall be sealed performance is good, flexible working, accurate and good durability, action for conveying have granules medium pneumatic valves should also do wear resistance test.