Thermostatic traps are normally open allowing fast venting of air during start-up |
During start-up, cold condensate drains through the trap, as temperatures reach 10 to 30 deg F of saturation, the thermostatic bellows element closes the trap |
During operation, thermostatic traps find an equilibrium point to drain condensate approximately 10 deg to 30 deg F below saturation at continuous flow |
Sub-cools condensate usually 10 deg to 30 deg F |
Normally open at start-up to provide fast air venting |
Follows steam saturation curve to operate over wide range of conditions |
Self-draining |
Energy efficient |
Fast response to changing conditions |
Fail mode is open |
Water hammer can damage bellows |
Superheat can damage bellows if it exceeds trap temperature rating |
Cooling leg required in some applications |
Brass bodies provide resistance to moderate water hammer and chemical attack |
Stainless steel Dura-Stata modules are easily replaced without disturbing piping connections |
Compact size reduces installation space requirements |
Inexpensive purchase price |
Range of seat pressures available up to 125 psig |
Balanced pressure |
Model 17C-A 2-25 |