What is a trap, do you know?

by:Lianke Valve     2022-09-06
According to the working principle of the trap, we can divide the trap into three types. They are mechanical, float type, and thermal energy type. But does anyone know what exactly they are? If not, let's take a look together! Next, I will introduce the trap to you. Mechanical type: The action depends on the change of the condensate level in the steam trap, including: Float type: The float is a closed hollow sphere. Open-up float type: The float is a barrel type with an upward opening. Open-bottom float type: The float is a barrel type with the open-bottom down. Thermostatic type: The action depends on the change of liquid temperature, including: Bimetallic sheet: The sensitive element is bimetallic sheet. Steam pressure type: The sensitive element is a bellows or an ink cartridge, which is filled with volatile liquid. Thermodynamic type: The action depends on the change of the thermodynamic properties of the liquid. Disc type: Due to the different flow rates of liquid and gas under the same pressure, the different dynamic and static pressures generated drive the disc valve to act. Pulse type: When the condensate of different temperatures passes through the two-pole orifice plates in series, different pressures will be formed between the two-pole orifice plates, which will drive the valve disc to act. Working principle: The steam 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 trap, the condensate flows to the bottom of the bucket, fills the valve body, and completely submerges the bucket body. Then, the condensate is discharged to the return water header through the fully open valve. Steam also enters the trap from the bottom of the barrel, occupying the top of the barrel, creating buoyancy. The barrel rises slowly, gradually moving the lever towards the valve seat until the valve is completely closed. Air and carbon dioxide gas pass through the vent hole in the barrel and collect at the top of the trap. The steam discharged from the exhaust hole will condense due to the heat dissipation of the trap. When the incoming condensate begins to fill the barrel, the barrel begins to exert a pull on the lever. As the condensate level continues to rise, the resulting force increases until the differential pressure can be overcome to open the valve. The trap valve begins to open and the differential pressure across the disc is reduced. The barrel will drop rapidly, leaving the valve fully open. The non-condensable gas accumulated on the top of the trap is discharged first, and then the condensed water is discharged. When the water flows out of the barrel, it drives the dirt out of the trap together. At the same time as the condensate is drained, steam begins to enter the trap again, and a new cycle begins. Main advantages: 1. The fluid velocity is controlled at about 30m/S to prevent cavitation damage, the fluid channel is labyrinthine, and the fluid direction is constantly changed; the allowable pressure difference is 25MPa. 2. The throttling surface is separated from the sealing surface, and different throttling elements are arranged according to the hydrophobic flow. The surface of the inner components of the valve is hardened, and the hardness can reach HRC70, which is tightly closed and has a long service life. 3. The valve body assembly adopts a self-internal pressure sealing structure, the greater the pressure difference, the better the sealing performance. 4. The valve body assembly and the actuator adopt a floating connection, which can eliminate the stuck phenomenon caused by the misalignment of the valve core and the push rod. Notes: 1. Before installation, clean the pipeline equipment to remove impurities to avoid blockage. 2. The steam trap should be installed as far as possible below the steam-using equipment and in a place where it is easy to drain. 3. Steam traps should be installed in places that are easy to overhaul, and should be arranged as centrally as possible to facilitate management. 4. Each steam heating equipment should be installed with steam traps separately. 5. The installation of the bypass pipe shall not be lower than the steam trap. 6. When installing, pay attention to the direction of the arrow on the valve body and the flow direction of the pipeline medium should be consistent. 7. The flow direction of the medium in the inlet and outlet pipelines of the steam trap should have a downward slope of 4%, and the nominal diameter of the pipeline should not be smaller than that of the steam trap. 8. When the drainage capacity of one steam trap cannot meet the requirements, several steam traps can be installed in parallel. For use in places where freezing may occur, antifreeze measures must be taken. The above is my explanation of the trap, I hope it can help you. Lianke Valve Co.,Ltd. is a company dedicated to valve innovation and manufacturing, hoping to manufacture better and more suitable valves for use in various places.
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