Air filter pressure reducing valve
Thread Content
During winter in the north, the pressure set for the air filter pressure reducing valve is 4 bar, and this value remains stable. Suddenly, it dropped to 2.5 bar and stayed there. When the air supply was disconnected and then reconnected, the pressure returned to 4 bar. Pressure fluctuations at the air supply inlet have been ruled out. Upon inspection, it was found that the area above the diaphragm was wet while the area below it was dry. Does anyone know exactly what the problem is? I believe it is possible that the water above the diaphragm has frozen, causing the diaphragm to deform and affecting the spring; however, there was no gas leakage at the site. The second possibility is that there is an iron ring in the central part of the diaphragm assembly; the center of this ring is perforated, and water enters those holes. Ice crystals form at the valve element as a result, which reduces the opening degree of the valve and lowers the outlet pressure.
The last edit to this post was made by ZhiGE on 2020-3-8 at 10:14. 1. I have encountered similar problems; it is generally believed that water enters through the exhaust port on the upper side of the diaphragm, which is used for exhaust to balance with atmospheric pressure； Later, protective measures were taken for this opening, but occasional malfunctions still occurred. Tests revealed that water was getting in through the screw on the pressure adjustment knob at the top; since the screw had flat threads, it did not provide any sealing function. Note: A small amount of water accumulation can evaporate through the vent. 2. Failures in the filtering pressure regulator generally occur after heavy rain or continuous rainfall, when the temperature drops below zero degrees, which causes the pressure feedback mechanism of the diaphragm or piston to fail. The working principle is shown in the figure below: 3. There are two types of pressure regulation controls for filter pressure reducers, one being diaphragm-type and the other piston-type. Piston-type ones are more susceptible to being affected. 4. Suggested improvement: Check the installation direction of the filter pressure reducer to prevent water from entering through the exhaust port ； Apply sealant glass glue at the threads of the filter pressure reducer, a type that can be removed later ； Shields can also be processed or manufactured for protection.
Thank you, I can now write the case studies in a standardized manner~
If the inlet pressure remains at a maximum of 5 kilograms, what is the maximum pressure that can be achieved at the outlet of the pressure reducing valve after passing through the filter? I believe it is also 5 kilograms.
Based on the principle, a filtering pressure regulator has only the functions of filling air and releasing air; it does not have a pressure-boosting function, so the outlet pressure will not be higher than the inlet pressure.
Water is getting in at the handwheel; I’ve wrapped it with self-adhesive tape, and I conduct more frequent inspections during winter