Capsule Steam Trap - How It Works
- On start-up, cold air and condensate enter the trap. As the capsule is
also cold, the valve is open and the air and condensate are discharged.
- The capsule warms up as the condensate approaches steam temperature. Its
liquid filling boils and the vapour pressure acting on the diaphragms pushes
the valve head toward the seat fully closing at the selected discharge temperature
before any steam is lost.
- As the condensate within the trap cools, the vapour filling condenses
and the internal capsule pressure falls. The valve reopens, discharging condensate
and cycle repeats.