What is the function and principle of the trap

The basic function of the steam trap is to discharge the condensed water, air and carbon dioxide gas in the steam system, and to prevent the leakage of steam automatically. The variety of traps is very much, there are different performance. Here to share the trap working principle is as follows:

The trap is installed between the steam heating equipment and the condensate return header. When opened, the barrel is at the bottom and the valve is fully open. After entering the drain valve, the condensate flows to the bottom of the barrel, filling the valve body and completely immersing the barrel. Then, the condensate is discharged to the return header through the fully open valve. Steam also enters the trap from the bottom of the barrel and occupies the top of the barrel, generating buoyancy. The barrel body slowly rises and gradually moves the lever towards the valve seat until the valve is completely closed.

As the condensate level continues to rise, the force generated continues to increase until it can overcome the pressure difference and open the valve. The trap valve begins to open, and the pressure difference acting on the disc decreases. Air and carbon dioxide gas through the barrel exhaust holes, gathered at the top of the trap.

Types and Principles of 1. Trap

1, mechanical type trap mechanical type, also known as float type, is the use of condensate and steam density difference, through the condensate level changes, so that the float lift drive the valve flap to open or close, to achieve the purpose of steam drainage.

2, thermostatic type steam trap using the temperature difference between steam and condensate caused by the temperature sensing element of the deformation or expansion drive valve heart opening and closing valve. Thermostatic trap supercooling degree is relatively large, the general supercooling degree is 15 degrees to 40 degrees, it can use part of the sensible heat in the condensate, the valve always has high temperature condensate, no steam leakage, energy saving effect is remarkable. 3, thermal power type trap according to the principle of phase change, by steam and condensate through the flow rate and volume change of different thermodynamic principles, so that the valve plate up and down to produce different pressure difference, drive the valve plate switch valve.

What are the role of the 2. trap trap use and use of steam equipment only need steam, in this equipment to produce condensate, condensate becomes a harmful fluid, but also mixed with air and other non-condensable gas, become the cause of equipment failure and reduce performance. In this case, the trap can quickly exclude the condensate, prevent steam leakage, exclude air and other non-condensable gases.

Precautions for the use of 3. traps

1. Before installing the trap, use pressurized steam to purge the pipeline to remove impurities in the pipeline, so as not to enter the trap and affect its normal operation.

2, before and after the trap to install the valve, convenient trap inspection and maintenance at any time.

3, condensate flow should be consistent with the trap installation arrow mark.

4. The outlet pipe of the trap cannot be immersed in water.

5, each equipment should be installed independently of a trap.

6, thermostatic trap need to have more than one meter before the heat preservation of the cooling pipe, other forms of traps should be as close to the equipment.

7. If there is condensate recovery after the trap, the outlet pipe of the trap should be connected to the main pipe from the top of the recovery main pipe to reduce back pressure and prevent backflow.

8. If condensate is recovered after the trap, pipelines of different pressure levels should be recovered separately.

9. After the trap, the condensate recovery manifold cannot climb, which will increase the back pressure of the trap and affect the discharge of condensate.

10, after the trap condensate into the recovery before the main pipe to install check valve, to prevent the condensate back to the pipeline.