WPN-250 Bi-Metallic Steam Traps are available in sizes 1/2″ – 1″ and pressure up to 2260 psig. Also the max diff. pressure up to 2230 psi. They are extremely robust and reliable, making them a suitable choice for superheated steam, high pressure applications, as well as outdoor applications that are subject to freezing.
When the system is cold, the trap is fully open; discharging air and cold condensate. When the bi-metallic plates inside the trap heat up, they expand; pulling the seat closed and restricting flow. Prior to steam temperature being reached, the trap shuts off tightly. Cooler temperatures cause the seat to open further. Therefore, trap capacity will increase when colder condensate is in contact with the Bi-metal element. Trap capacity is therefore given at different temperatures below saturated steam temperature.