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STEAM TRAPS

There are 4 types of steam trap:

Mechanical Traps- They have a float that rises and falls in relation to condensate level and this usually has a mechanical linkage attached that opens and closes the valve. Mechanical traps operate in direct relationship to condensate levels present in the body of the steam trap. Mechanical steam traps have a typical service of life of 3 years. Inverted bucket and float traps are examples of mechanical traps. Float traps are classified into "free ball float traps" and "lever ball float traps".

Temperature Traps- They have a valve that is driven on / off the seat by either expansion / contraction caused by temperature differ from mechanical traps in that their design requires them to hold back some condensate waiting for it to cool sufficiently to allow the valve to open. In some exceptional circumstances this is not desirable if condensate needs to be removed as soon as it is formed. According to best practices to save energy and reduce CO2 emissions, in most of applications (like tracing lines) it is universally accepted that condensate must be removed 40 °C (104 °F) below saturation temperature. This best practice is only possible by using temperature operated traps. Thermostatic traps, Bi-Thermostatic traps and bimetallic traps are examples of temperature operated traps.

Thermodynamic (TD) Traps - Thermodynamic traps work on the difference in dynamic response to velocity change in the flow of compressible and incompressible fluids. As steam enters, static pressure above the disk forces the disk against the valve seat. The static pressure over a large area overcomes the high inlet pressure of the steam. As the steam starts to condense, the pressure against the disk lessens and the trap cycles. This essentially makes a TD trap a "time cycle" device: it will open even if there is only steam present, this can cause premature wear. If non-condensable gas is trapped on top of the disc, it can cause the trap to be locked shut.

Venturi Nozzle Traps- They work based on the two-phase flow to remove condensate from steam systems. Steam and condensate pass through multiple stages where the denser liquid (condensate) continuously throttles the venturi nozzle, which keeps the steam from escaping. The design is very simple and does not contain any mechanical part that can fail. Its correct sizing is somewhat more critical than mechanical traps. Because a working steam system creates condensate continuously, the venturi nozzle is loaded continuously. Any contaminations are carried away with the condensate.



| Ball Valves | Cast Steel Globe Valves | Cast Steel Gate Valves | Cast Steel Check valves |
| Flush Bottom Valves | Butterfly Valves | | Steam Traps | Pilot Operated Pressure Reducing Valves | Safety Valves | Moisture Separators | Crane - Butterfly Valve | Saunders - Diaphragm Valve (Hc4)
Strainers| Disc Check Valves etc. |
|Ball Float Traps| |
Union Bonnet Wheel Valve| |ISI Globe Valve| |ISI Gate Valve|
|
Globe Steam Stop Valve | |Cast Steel Globe Valve| |Ball valve for Water, oil, air application|


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