The dual tube filter element DQ6803GA20H1.5C is mainly used for oil filtration in the top shaft oil system or hydraulic system of steam turbines. Its working principle is based on the dual tube design and efficient filtering medium, ensuring that the oil reaches the required cleanliness before entering the oil pump.

1. Dual tube design and switching function
A dual tube filter consists of two independent filter cartridges, each with a filter element installed inside. This design allows for the replacement or cleaning of the filter element without stopping the machine, ensuring the continuous operation of the system. The specific work process is as follows:
-Normal working condition: One of the filter elements (such as filter element A) is in working condition, and hydraulic oil is filtered through this filter element to remove impurities. The other filter element (such as filter element B) is in standby mode.
-Filter blockage and switching: When filter A is blocked by impurities and the pressure difference increases, the system will send a signal to prompt the replacement of the filter. At this point, filter element B is switched to the working state and filter element A is switched to the standby state through the switching device.
-Filter element replacement: During the operation of filter element B, the operator can safely replace filter element A. After the replacement is completed, filter element A is reused as a backup filter element.

2. The role of filter media
The filter element DQ6803GA20H1.5C adopts high-quality glass fiber filter material, which has high filtration accuracy and large pollutant holding capacity. Its working principle is:
-After the oil enters the filter element, solid particles and impurities are blocked by the filter material, and clean oil flows out through the filter element.
-The high-precision and uniform pore size design of the filter material ensures efficient filtration while reducing the resistance to oil flow.

3. The function of differential pressure transmitter and bypass valve
-Differential pressure transmitter: used to monitor the pressure difference between the inlet and outlet of the filter element. When the pressure difference exceeds the set value, the transmitter will send a signal to prompt the operator to replace the filter element.
-Bypass valve: When the filter element is severely clogged, the bypass valve will automatically open to ensure that the oil can still flow when the filter element is clogged, but the filtration effect will decrease at this time.

4. System protection and maintenance
-Reduce wear: By removing solid particles from the oil, the filter element significantly reduces wear on the oil pump and other hydraulic system components, extending equipment life.
-Maintenance and replacement: Regularly checking the blockage of the filter element and replacing it in a timely manner according to system prompts is the key to maintaining efficient system operation.