American standard valve is a fluid conveying system in the control unit, a cut-off, regulation, guide, to prevent the reverse flow, voltage regulator, the leakage of the shunt or overflow, etc; Used for fluid flow control system of the valve, from the most simple of American standard cut-off valve to the extremely complex control system used in all kinds of American standard valve, its quite a wide varieties and specifications. The valve can be used to control air, water, steam, all kinds of corrosive medium, mud, oil, liquid metal and radioactive medium, etc. All types of fluid flow. American standard valves are API and ASME standard, ASTM, ASTM material standard; According to the American standard design, manufacturing, production and testing of the valve is called the American standard valve. American standard valve pressure test standard: 1 is the nominal pressure. Five times, the test time for 5 min, body not burst test time, no deformation, don't ooze water valve leakage, pressure gauge does not drop as qualified. Qualified strength test, then the leak test, leak test pressure is equal to the nominal pressure, the valve without leakage test time, pressure gauge does not drop as qualified. American standard flange can refer to ASME B16. 5 standard about flange. American standard valve type, code-named Z - Gate valves, P - Drain valve, Q - Ball valve, D - Butterfly valve, J - Cut-off Industrial Valves, etc. ; American standard Industrial Valves pressure corresponding to the national standard: for 300 lb. For 2. 5. 4. 0. 150 lb 1. 6, 2. 0. 6 400 lb. 3mpa。 10 600 lb. 0mpa。 Class because the nominal pressure and the temperature of the benchmark is not the same. No strict corresponding relation between the two. American standard valve with gb valve five main difference: 1, the unit for national standard valve nominal diameter mm, American standard valve nominal diameter of the unit is in ( Inches) 。 Level unit is MPa, 2 gb Industrial Valves, American standard valve pressure rating unit is the LB. 3, flange standard American standard and national standard is not the same. 4, the structure is not the same length. 5, inspection requirements, American standard valve inspection requirements than the elevation.
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