Standard rating: 200 WOG
Brass Check Valves typically have a 200 WOG rating. WOG stands for Water, Oil, and Gas. 200 WOG means 200 psi for these media. Example: a valve for a 200 psi water line.
Higher ratings: 400 WOG and 600 WOG
Some Brass Check Valves have higher ratings. 400 WOG and 600 WOG are common. These handle higher pressures. Example: a 600 WOG valve for industrial use.
Pressure rating at higher temperatures
Pressure ratings decrease at higher temperatures. A 200 WOG valve may be rated lower at 180°F. Always check the temperature-pressure chart. Brass Check Valves require derating for heat.
Steam ratings: SWP
Some Brass Check Valves have SWP ratings. SWP stands for Steam Working Pressure. A 150 SWP rating means 150 psi steam. Example: a valve for a low-pressure steam line.
Example: residential water supply
A home uses a Brass Check Valve with a 200 WOG rating. The valve handles household water pressure. Example: a safe water supply.
Example: commercial water system
A commercial building uses a Brass Check Valve with a 400 WOG rating. The valve handles higher pressure. Example: a reliable commercial system.
Example: industrial process line
A factory uses a Brass Check Valve with a 600 WOG rating. The valve handles high pressure. Example: a durable industrial valve.
Pressure testing
Brass Check Valves are pressure-tested. They are tested at 1.5 times the working pressure. This ensures safety. Example: a valve tested at 300 psi for a 200 WOG rating.
Cracking pressure
Check valves have a cracking pressure. This is the pressure needed to open the valve. Low cracking pressure is better for low-flow systems. Brass Check Valves have different cracking pressures.
Manufacturer specifications
Always check the manufacturer's pressure rating. Ratings vary by valve type and size. Brass Check Valves should be used per guidelines.
Final pressure rating summary
Brass Check Valves typically have 200 WOG ratings. Higher ratings are 400 WOG and 600 WOG. Steam ratings are given in SWP. Pressure ratings decrease at higher temperatures. Brass Check Valves are available for many pressure ranges. Example: choose the right rating for your system.