VALVE CODES & STANDARDS
Codes & Standards Made Easy
In an industry with more codes and standards that any human could possibly memorize—having a handy list of these to reference when searching for a hard-to-find valve can make all the difference.
These codes and standards charts cover material, product dimension, design, examination, inspection, testing, procedure, pressure/temperature ratings and safety.
Pressure classes refer the pressure-temperature operating ratings. The class defines the working pressure range at a specific temperature that a valve is suitable to operate. The ratings provided here are tabulated by material groups.
- Based on the American Society of Mechanical Engineers
- Some Class Examples: Class 150, Class 300, Class 600, Class 900, Class 1500, Class 2500
- Commonly used by the Chemical, Refining and Power industries
CWP (COLD WORKING PRESSURE)
- CWP is defined as the maximum service pressure permitted in the ambient temperature range -20 to 100F expressed in PSI
- Some Class Examples: 120CWP, 150CWP, 200CWP, 300CWP, 400CWP, 500CWP, 800CWP
- Mostly used to categorize Iron, Bronze or Brass valves
WOG (WATER OIL & GAS)
- WOG is an older standard that does not apply a maximum temperature requirement
- Some Class Examples: 400WOG, 600WOG, 800WOG, 1000WOG, 2000WOG, 3000WOG