How Sealed Steam Traps work?
Spirax Sarco Sealed Steam Traps operate using the same proven internal principles as traditional mechanical and thermostatic traps, but with one critical difference: the body is permanently sealed.
Instead of using a bolted cover and gasketed joints, the trap is welded closed at the factory.
Inside, the operating mechanism—whether a balanced pressure capsule, inverted bucket assembly, or bimetallic element—responds to the presence of condensate and steam in the same way as its serviceable equivalent.
For example, sealed thermostatic models use a temperature-sensitive capsule that opens when cooler condensate is present and closes as steam temperature is reached, while sealed inverted bucket designs rely on buoyancy to cycle the valve open and closed.
This ensures accurate condensate discharge with zero live steam loss in normal operation.
The sealed construction eliminates external leak paths entirely. With no gaskets, cover bolts, or joint faces, there is nothing to loosen, degrade, or fail over time.
This makes Spirax Sarco Sealed Steam Traps ideal for tracer lines, hygienic services, and difficult-to-access installations where maintenance time must be minimised.
The result is dependable condensate control, improved safety, and a significant reduction in maintenance overhead across the steam system.
