How to determine the flow direction of a three-way valve and the structure of deaerator accessories
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This post was last edited by liu530014416 on 2020-3-22 08:58. 1. Dear teachers, is the flow direction of this three-way valve correct? 2. Teachers, what is the professional name of this accessory, and what are the functions of 3, 4, and 5? What is the purpose of the red DN20 pipe that goes downward? Is it used for water replenishment? How to use this accessory? What is the internal structure like? Is it a large tube surrounding a smaller tube? 3. This rotary diaphragm deaerator is equipped with an exhaust pipe fitted with a manual valve, which leads to the steam drain expansion vessel. So, is the exhaust from the deaerator released automatically through the red component mentioned above, or is it done manually by opening the exhaust valve? It is said that the pressure should be controlled at 104 degrees and 20 KPA; if the exhaust valve is opened manually, the pressure in the deaerator shouldn’t be that high.
The flow direction indicators for the medium inside the three-way valve are good. For information on the water seal structure of deaerators, please refer to the explanation in the link below: https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=767002&page=1
Thanks. Should a pipe be connected for venting at those 3 flanges? And how does the deaerator maintain a pressure of 20 KPA? How are the non-condensable gases removed? I checked the deaerator here; there is a safety valve on the deaeration head, as well as a manual vent valve. Do non-condensable gases get discharged automatically through the safety valve? The manual valve remains open; if it is open, the deaerator will not have a pressure of 20 KPA.
3 Here, it should be connected to a vent, but not pointing upwards, otherwise it can easily injure people! The pressure of the deaerator is controlled by the incoming steam; do you really think that draining it will prevent pressure control? When the intake is greater than the exhaust, there is pressure inside the device, right?
Understood, the manual drain valve is left open