Nicholson has a wide variety of Thermodynamic Steam Traps to accommodate applications through psi. Most models utilize Nicholson's exclusive Celtron®. Thermodynamic steam traps. If you wish to learn more about the Velan steam trap line or traps in general, please visit Thermodynamic steam traps have a unique operating principle which relies on the dynamics of water and flash steam. They are simple, robust and reliable and.


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From the Closed to thermodynamic steam traps Open Position Thermodynamic Explanation When in the closed position, steam inside the pressure chamber exerts a Closing Force on the valve disc and seals the pressure chamber shut.

Thermodynamic Steam Traps | TLV - A Steam Specialist Company (International)

Thermodynamic steam traps time, the pressure chamber thermodynamic steam traps Closing Force i. When the Closing Force becomes weaker than the Opening Force Lifting Forcethe disc elevates and discharges condensate again. In the closed position, the Closing Force is determined solely by the steam pressure acting on the top of the disc.

The Opening Force is determined by inlet pressure on the underside area of the disc. That Opening Force area becomes reduced when the valve is closed, essentially confined to the inlet port diameter.

As a simplified explanation, a greater surface area on the top of the valve disc than on the bottom creates a significant force difference, and can provide tight closure.

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This difference in surface areas prevents the valve from opening even if the pressures exerted on both sides of the disc are similar, which is why some manufacturers employ wider diameter discs for more effective sealing.

When the Closing Force becomes weaker than the Opening Force, the valve opens thermodynamic steam traps a new discharge cycle begins. Open and Closing with Air in the Steam System Aerodynamic Explanation At least on start-up, the vapor stream that enters the trap can also be comprised of significant amounts of air.

Air and steam vapors act similarly in creating the Closing Force to shut a thermodynamic disc trap. However, unlike steam, air does not condense at environmental conditions to allow the disc to open; thermodynamic steam traps common disc traps can lock shut.

How Disc Traps Work: A Look at their Mechanism and Merits

This condition is known as Air Binding. Air binding can be a typical event creating a drainage failure cold trapand there are several methods thermodynamic steam traps deal with this phenomenon.


For related information, please see: Air Binding Air Binding in Disc Traps Since air does not thermodynamic steam traps like steam, the pressure within the chamber does not drop and the Opening Force cannot overcome the Closing Force, preventing condensate discharge.

Disc trap manufacturers deal with air binding issues in a variety of ways.


Some create intentional air leakage pathways across the disc. Others incorporate a separate blowdown valve on a strainer to be used at start-up to help vent vast amounts of air.

The differences in design may be thermodynamic steam traps by referring to functional steam loss values, which can represent steam loss during normal operation. If a trap already has a built-in leak pathway, its sealing capability thermodynamic steam traps be compromised from the beginning.

Usage of a Leakage Path If a leakage path is created, steam as well as air is discharged, wasting energy.

Thermodynamic Steam Traps

The valve also opens and closes more frequently, which increases wear and shortens the life of the trap. Advanced Thermodynamic Disc Traps An innovative method of handling air is the combination of a built-in thermostatic air vent that works on start-up.

This advanced disc trap design is called Thermodynamic Disc thermodynamic steam traps Thermostatic Vent. If this is a problem, it can easily be fitted with a diffuser which considerably reduces the discharge noise.


Mains drainage applications often only need to be fitted with low capacity versions, providing proper consideration is given to siting the drain pockets correctly. Impulse steam trap Thermodynamic steam traps impulse trap as shown in Figure At 'start-up' the main valve D rests on the seat E leaving a passage of flow through the thermodynamic steam traps between piston and cylinder and hole F at the top of the piston.

Pages - Thermodynamic Steam Traps

Increasing flow of air and condensate will act on the piston thermodynamic steam traps and lift the main valve off its seat to give increased flow. Some condensate will also flow through the gap between the piston and disc, through E and away to the thermodynamic steam traps outlet.

As the condensate approaches steam temperature some of it flashes to steam as it passes through the gap.