1. Valve pressure classification:
The pressure standards of valves mainly include the national standard (equivalent to the German standard, because the German industry developed early, and many Chinese standards refer to the German standard), the American standard, and the Japanese standard.
1. The national standard pressure level is represented by PN** (the unit is kilogram, ** represents pressure, which is a number), commonly used levels are PN6/10/16/25/40/64/100, and higher pressures can be specified Digital representation.
2. The pressure of the American Standard is represented by **LB (LB is the unit <pound>, ** represents the pressure, which is a number). Commonly used grades are 150/300/600/900LB. Higher pressure is also expressed by specific pressure numbers plus units.
In addition, American standard pressure is also represented by class**, such as class150/300/600,
Class150 is equivalent to 150LB.
3. The pressure of the daily standard is represented by **K, and the commonly used ones are 10K and 20K. You can check relevant information for more information.
Of course, valves of different standards not only have different pressure representation methods, but also have completely different installation dimensions and flange standards.
2. Valve pressure unit and conversion:
1. MPa, Kg, Bar. Note: 1MPa = 10Kg=10bar
1Mpa=1000Kpa (kpa), 1KG=100Kpa (kpa),
2. PSI, commonly used in relatively high pressure levels, such as 1000psi, 5000psi, 9000psi,
1000psi is approximately 64kg, which can be converted in turn.
3. Pound LB, the pressure unit of American Standard, if you see ***LB, it can be judged as an American Standard valve.
4. K is the Japanese pressure unit, commonly 10K, 20K, which is the pressure mark of the Japanese standard valve.
Unit conversion:
150LB=PN20, 300LB=PN50, 400LB=PN64, 600LB=PN100, 900LB=20, 150LB=PN150, 1500LB=PN250, 2500LB=PN420,
Regarding the pressure of the valve, it can basically be divided into two types: normal pressure and high pressure. There is no absolute limit between the two, but only relative.