Fabric compensators versus water traps (also known as steam traps) are two different devices that are used to solve different problems in piping systems, respectively. Fabric compensators are mainly used to compensate for thermal expansion, vibration or displacement in pipeline systems, while water traps are used to automatically remove condensate water from steam systems while trying to prevent steam from escaping.
The principle of action of a water trap is as follows:
Condensate collection and discharge： When steam condenses into water in a heating device, the trap automatically detects the presence of condensed water and drains it from the system. This is because condensed water (condensed water) is denser than steam, so it can be deposited at the bottom of pipes or equipment.
Thermodynamic water trap：
Float trap: This is one of the most common types. Inside the trap is a float that rises as condensate accumulates, pulling the valve open, allowing the condensate to drain. Once the condensate drains, the float drops and the valve closes, stopping the steam from escaping.
Bimetallic sheet water trap: Two metals with different expansion coefficients are combined together, and when condensed water is present, the bimetallic sheet is bent due to temperature difference, driving the valve to open and discharging the condensed water; When the condensate is drained, the steam reheats the bimetallic sheet to return it to its original shape, closing the valve.
Pulsed water trap: Use pressure pulses of steam to operate the valve. When the condensate accumulates to a certain amount, the valve is briefly opened to allow the condensate to drain quickly, and subsequently the valve is closed to stop the steam from escaping.
Mechanical water trap：
Bell-shaped float trap: Similar to the float type, but using a bell-shaped float that controls the valve opening and closing as the condensate water level rises and falls.
Thermostatic water trap：
Such traps operate using the temperature difference between steam and condensate. They usually contain a sensitive element, such as a vapor pressure-sensitive diaphragm or bellows, which causes the valve to open to drain the condensate when the temperature drops (i.e., when condensate is present).
The trap is designed to ensure efficient operation of the steam system and avoid the accumulation of condensate in the pipeline or equipment, as the condensate not only hinders the flow of steam, but also causes water hammer phenomenon, causing vibration and damage to the pipeline. In addition, the timely drainage of condensate water also helps maintain the thermal efficiency of the system and avoids energy waste.