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Air is problematic &harmful ingredient in steam going to process area. Presence of Air leads to corrosion and leakage from stem & condensate line and from vessels.

When liquid is removed from the system during startup, the air inside the steam & condensate piping is pushed through the air vent which steam is charged in to system.

Thermostatic Air vent:-

Uni Klinger offers thermostatic air vents for positive venting of air and other non-condensable gases from steam in chamber-type heat-transfer equipment. Typical applications include jacketed vessels, retorts, vulcanizers, jacketed sterilizers or other contained equipment where air could accumulate in the possible location of steam chamber and result in lower heat-transfer.

Air is automatically vented at slightly lower temperature than steam temperature throughout the operating pressure range.

Balance pressure type air vents are usually recommended for removing air in steam systems. Uni Klinger also offer Bimetallicair vents, however these are not recommended for removing hot air from steam systems because the valve opening temperature is more or less fixed. This is different from the valve on balanced pressure type air vents, which opens at a temperature that is a certain number of degrees lower than the saturation temperature of steam. Hot air is therefore discharged at all times regardless of fluctuations in steam pressure.

Mechanical type Steam Trap:-

The most effective way to release air by a steam trap from a steam space is to use a float type steam trap with an inbuilt air vent. As condensate should always get to the trap, the passage of non-condensable to the integral air ventis not held up during normal operation.

Uni Klinger Make Air eliminator are offered to remove air from water line, this air eliminator is installed at the highest point of pipeline so that the air is removed from this trap.

Steam trap bypass:-

It is natural to fit manual bypass before steam trap& is opened manually only at the time of start-up & this helps to remove the entrapped air. This allows the total flow of condensate to reach the trap.
Bypasses are often found around bucket traps, which are used to vent air. The assembly can be made automatic and more efficient by simply replacing the manual bypass valve with an automatic air vent. Manual bypasses may left open due to human error during operation and are therefore can be a potential source of wastage.

Vacuum breakers:-

An “air vent valve “has been installed at the top of vertical water supply piping for the purpose of discharging air. In case, pressure inside the pipe drops because of temporary suspension of water supply or due to some accident, the pressure at the top of the vertical piping becomes negative, this may lead to phenomenon of a backflow (inverted siphon) within the building. To avoid this, the top of vertical piping requires an air vent valve with vacuum breaker, which does function of introducing sufficient quantity of air to eliminate negative pressure and also capable of discharging air under pressure. Example- Top of vertical piping in collective housing and buildings, Top of vertical piping connected to direct boosting water supply lines 

Superheated steam mains:-

Superheated steam mains, generally, only require air venting at start-up. For this application, an air vent suitable to withstand high temperatures is required or a bimetallic type would be the best choice.