How Thermodynamic Traps Work

The disc is the only moving part in the thermodynamic steam trap. There are two concentric seat rings under the disc in the valve body. The surface is very flat. When the disc is sucked into the seat ring, it will play a role Good closing action.

The inner ring seals the drain (steam outlet), and the outer ring seals a space above the disc. Except for the part facing the valve seat ring under the disc, and a small area in the center facing the inlet channel of the trap, most of the rest of the area is facing the condensate after the outlet.

After the steam comes out through the water trap, its flow rate increases, and the disc will be sucked into the valve seat ring suddenly. At this time, the upper part of the disc is full of steam with relatively high pressure, and the lower part is facing the lower temperature and higher pressure steam. lower condensation.

As the temperature drops, the steam on the disk condenses, the pressure drops, and the disk is pushed open again under the back pressure of the condensed water at the outlet... the cycle repeats.

According to the principle of phase change, steam traps rely on the different thermodynamic principles of flow rate and volume change when steam and condensed water pass through, so that different pressure differences are generated between the upper and lower sides of the valve plate, and the valve plate is driven to open and close the valve. Because the working power of thermodynamic steam trap comes from steam, so the waste of steam is relatively large. Simple structure, water hammer resistance, maximum back of 50%, noise, frequent valve work, short service life.