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Principles of steam traps——HERO VALVE

HERO VALVE CO.,LTD.
2020-07-03

A steam trap is a kind of valve, also called a trap, and a drain valve. It drains condensate, air, and carbon dioxide gas in the steam system as soon as possible, while automatically preventing steam leakage to the maximum extent. There are many types of traps, each with different performance.


When selecting a trap, first select its characteristics to meet the best operation of the steam heating equipment, and then consider other objective conditions, so that the trap you need is correct and effective.


Free float steam trap


The free float steam trap uses the principle of buoyancy. The float floats up and down with the change of water level according to the amount of condensate, automatically adjusts the opening of the valve seat hole, and continuously discharges the condensate. When the condensate stops entering, the float The bottom of the drop returns to the closed position, and the drainage stops. Since the drain valve seat hole is always below the condensed water level, a water seal, water, and gas are naturally separated, and no steam leakage is achieved.


Bellows type steam trap


The main action element of the membrane box steam trap is a metal membrane box filled with a liquid whose vaporization temperature is lower than the saturation temperature of water. When the device was just started, low-temperature condensate appeared in the pipeline, and the liquid in the capsule was in a condensed state. The valve is in the open position. When the temperature of condensate gradually rises, the filling liquid in the capsule starts to evaporate, the pressure in the capsule rises, and the diaphragm drives the valve core to move in the closing direction. Before the condensate reaches the saturation temperature, the trap is completely closed, and the capsule follows the steam temperature Change control valve switch, play a role in blocking steam and drainage.


Inverted bucket trap


Inside the inverted bucket trap is an inverted bucket as a liquid-level sensitive part. The opening of the bucket is downward, and the connecting lever of the inverted bucket drives the valve core to open and close the valve. The inverted bucket trap can exhaust air, not afraid of water hammer, and has good anti-fouling performance. The degree of supercooling is small, the steam leakage rate is less than 3%, the maximum back pressure rate is 75%, there are many connections, and the sensitivity is not as good as that of a free float trap. Because the inverted bucket trap is closed by steam upward buoyancy, when the working pressure difference is less than 0.1MPA, it is not suitable for selection.


Bimetallic steam trap


The bimetallic steam trap is a bimetallic temperature sensing element that drives the valve core to open and close the valve. When the device is just started, low-temperature condensate appears in the pipeline, the bimetallic plate is flat, and the valve core is in the open position under the elastic force of the spring. When the temperature of the condensate gradually rises, the bimetallic temperature sensing element begins to bend and deform, and pushes the valve core to the closed position. Before the condensate reaches the saturation temperature, the trap is completely closed. There is always high temperature condensate in front of the valve, no steam leakage, and good energy saving effect.


Thermodynamic steam trap


Thermodynamic steam trap is a very sturdy and simple working trap. This type of steam trap works on the power generated by the flash steam passing through the trap. During the start-up phase, due to the pressure, the disc is lifted, and the condensate and air pass through the inner valve seat and are discharged from the three small holes in the peripheral outlet through the lower part of the disc. There is a movable valve plate in the thermodynamic steam trap, which is both a sensitive part and an action execution part. According to the different thermodynamic principles of the flow rate and volume change when steam and condensed water pass through, different pressure differences are generated up and down the valve plate, and the valve plate is driven to open and close the valve.


——CHINA·HERO VALVE



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