How Temperature Discharge Steam Traps work
Spirax Sarco Fixed Temperature Discharge Steam Traps operate using a liquid expansion element that reacts precisely to temperature. Inside the trap is a sealed element filled with a temperature-sensitive fluid. As condensate cools, the fluid contracts, allowing the valve to open and discharge the liquid. When the temperature rises toward the preset point, the fluid expands, pushing the valve closed. Unlike self-adjusting thermostatic traps, these traps are set to operate at a fixed temperature, meaning condensate is only released once it reaches that defined threshold. This makes them ideal for applications where controlled discharge is required, such as tracing lines, freeze protection, and systems that rely on sensible heat.
This fixed-point operation delivers predictable and stable performance. In steam applications, models like the No.8 liquid expansion trap can be adjusted to discharge condensate at a chosen temperature between 60°C and 100°C, allowing engineers to fine-tune heat retention within the system. In water and frost protection duties, products such as the Bydrain remain fully closed during normal conditions, but automatically open as temperatures approach freezing, draining the line before damage can occur. By responding purely to temperature rather than pressure or flow, Spirax Sarco Fixed Temperature Discharge Steam Traps provide precise control, protect pipework and equipment, and ensure systems remain safe, efficient, and stable in both steam and water circuits.
