Instrument air pressure reducing valve
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Pneumatic control valves are all equipped with an instrument air pressure regulator as an accessory. I would like to ask: besides regulating pressure and filtering dust, why does water accumulate inside it in winter? Also, what are the hazards if the water accumulation here isn’t drained? (I won’t hesitate to give high scores to those who answer.)
The air filter you mentioned is just one of the components in the air supply unit. Let me post the technical details regarding the air supply unit! The most direct hazard is that water freezing in winter can block the nozzle of the locator, preventing control of the control valve! ! ! :Handshake: In pneumatic transmission systems, the pneumatic trio refers to the air filter, pressure regulator, and oil mister. Some brands of solenoid valves and cylinders allow for oil-free lubrication (lubrication is achieved through grease), so there is no need to use an oil mister! A component formed by the tubeless connection of three major parts is called a triad. The three key components are essential air supply devices in most pneumatic systems; installed near the equipment that uses air, they serve as the final guarantee for the quality of compressed air. The installation order of the three main components, in the direction of air flow, is the air filter, followed by the pressure reducing valve, and then the oil mister. A combination of an air filter and a pressure reducing valve can be called a pneumatic two-piece unit. The air filter and pressure reducing valve can also be combined together to form a filter-pressure reducing valve (which functions in the same way as when the air filter and pressure reducing valve are used separately). In some situations, oil mist in compressed air is not allowed, so an oil mist separator is required to filter out the oil mist from the compressed air. In short, these components can be selected as needed and combined for use. Air filters are used to clean the air supply; they can remove moisture from compressed air, preventing it from entering the device along with the gas. A pressure relief valve can stabilize the air supply, keeping it at a constant level, and this helps to reduce damage to hardware such as valves or actuators that may occur due to sudden changes in air pressure. Filters are used to clean the air supply; they can remove moisture from compressed air, preventing water from entering the device along with the gas. An oil mister can lubricate the moving parts of a machine, as well as those parts where it is difficult to apply lubricant, **thereby extending the machine’s service life. Instructions for Using the Air Source Treatment Triple Unit 1. There are two ways to drain water from the filter: pressure-driven drainage and manual drainage. When draining manually, the water must be removed until it reaches the level below the filter element. 2. When adjusting the pressure, pull up the knob first before turning it; pressing down on the knob serves to lock it in place. Turning the knob to the right increases the outlet pressure, while turning it to the left decreases it. When adjusting the pressure, it should be increased gradually and evenly to the desired value, rather than being adjusted to that level in one step. 3. Method of using the oil feeder: The oil feeder uses JIS K2213 compliant transmission oil (ISO Vg32 or equivalent). Please do not fill the cup to more than 80% full. The number 0 represents the lowest oil level, while 9 represents the highest oil level. It cannot rotate from the 9-0 position; it must be rotated clockwise.
The air contains a certain amount of moisture, and after passing through the air compressor, its temperature rises to some extent. Under the effect of condensation, some water accumulates in the two air storage tanks of the air compressor; this water collects in the air filter pressure reducing valve, and the water accumulated in the transparent cover at the bottom of this valve can be seen with the naked eye.
I don’t think there will be any water issue, because the valve operates repeatedly, and such repeated operation means that the instrument air is in circulation. We are a methanol plant in Shaanxi, and we have not encountered any issues with water accumulation there to date. Also, what type of pressure relief valve are you using? Could it be related to the pressure relief valve?
Filtering dust is easy to understand, but how is water removed? If it’s not discharged at the same time, how is it carried to the nozzle?
The presence of water in the air pressure reducing valve indicates that the quality of the instrument air is inadequate; the dew point of the instrument air should be 10 degrees lower than the local minimum ambient temperature.
I think it’s because the dew point of the instrument air is too high, which causes water accumulation in winter
Accumulated water indicates that the instrument air is of poor quality; the standard requires that the dew point be at least 10 degrees lower than the local minimum temperature.
The air filtration pressure reducing valve not only filters and reduces pressure but also serves to separate and settle substances, allowing liquids in the air to settle and achieving gas-liquid separation. Since the air passes through the filter at high speed, it is crucial to carefully check whether the drying system is functioning properly, starting from the source. If water accumulates, freezing can occur at low temperatures, resulting in a disruption of the gas supply and affecting the operation of the valve.
Find the source; if it’s troublesome, install a water outlet device on the main pipe!
All air treatment units nowadays come equipped with automatic drain valves. Please improve the air quality; under normal conditions, there should be no water accumulation in the instrument air
There are no items to score today; we will score them tomorrow. May I ask for the model of the filter pressure reducing valve with automatic drainage in your factory?
The accumulation of water in winter is also a normal phenomenon, but it must be drained at all times to prevent water from reaching the electrical valve positioners or electrical converters and freezing there, which could cause the self-regulating valves to stop functioning. I have encountered this phenomenon many times; the solution is that there is a drain knob at the bottom of the filter – simply turn this knob slightly open, and once you feel air being released, that’s it. While this results in energy waste, it ensures the normal operation of the device.
After thinking it over, I realize that we here in the south have relatively fewer troubles. After all, the temperature in Guangdong never drops below zero degrees, so at least I don’t have to empty the water tank as often as those in the north;P
The moisture content in the instrument air indicates that the dehumidification effect of the compressed air produced by the air compressor is poor. High moisture levels in the instrument air pose the greatest risk to control valves, as it can cause the springs in the actuation mechanisms to rust, and the cylinders may freeze up, preventing the control valves from functioning properly.
It’s very dangerous for instrument air to contain water; it’s necessary to address the issue at its source, improve the quality of the instrument air, and identify the causes to prevent cross-contamination of different media
High moisture content in instrument air indicates that the drainage of water from the instrument air is not timely; strengthening this drainage process is the key solution!
In fact, water in the instrument air is not allowed, whether in the north or the south. In winter, the north may freeze over ； In the south or during other seasons, moisture in the instrument air can cause instability in the operation of control valves; in severe cases, the control valves stop functioning.