Valve pressure test is too simple for the construction workers, but carefully rolled over the norms, or found some problems: 1, test pressure: almost all of the norms of the strength test pressure is 1.5 times the nominal pressure, which is not problem. However, most of the high pressure seal test pressures (SH JB class) are 1.1 times the nominal pressure, but GB50235 (I do not know if there is no other norms?) Is 1.0 times the nominal pressure. 2, the regulator time: Part of the specification (GB50235) is packing pressure for 5 minutes, but also part of the (SH) is holding pressure ranging from 60 to 120 seconds. In practice, we generally use the packing pressure for 5 minutes, and most of the petrochemical plant requires the use of SH class norms, do not know if this is right? 3, the pilot project: No matter what the valve in the construction, are generally for strength and high pressure seal test (most valves do not have the upper seal structure), and petrochemical norms for different types of valves have different requirements, such as DN25PN150 Of the gate valve, petrochemical specifications (SH3064, JB / T9092) requirements must be made of the project: strength test, low pressure seal test, high pressure seal as optional. Is it necessary for us to improve our pilot project in accordance with the regulations? (1) This problem really makes people have a headache, or it is not easy to handle. Each industry has its own standard. The main one is to see which industry you are doing, and you can only do it according to the requirements of others. Of course, export products, we all know, you have to do in accordance with the corresponding foreign standards. (2) not only the test, you are not the same in other respects, such as the valve wall thickness requirements, flange connection size, the length of the structure is to do the valve is difficult to achieve a unified product but there are real problems. So, we do valve products is difficult to do it all.