That direction is commonly shown somewhere on the unit with an arrow. The regulator will usually have an air gauge which visibly indicates the air pressure setting for the airflow to the downstream side of the regulator.
Note: Air pressure regulators in compressed air systems can only lower the air pressure. Dialing the pressure up past the supply line pressure cannot increase the downstream pressure past the tank pressure level, despite however many times you turn the knob! Air compressor regulators can be found within a combined system that has filters and lubricators as well.
For the sake of simplicity, I have not included a gauge in the drawing below, and only showed the theoretical flow path of the regulator, to give you an idea of how they actually work. This seal moves up and down, reacting to spring pressure or air pressure as the air supply pressure varies, and the seal moving against or away from the seats, allows more or less air to flow through the regulator. Lessening flow allows pressure to drop, increasing flow allows pressure to rise. The regulator acts very quickly, increasing or decreasing the flow of air through itself so that the downstream pressure remains fairly constant.
The accuracy of the air pressure downstream of the regulator is directly related to the quality of that air regulator. Lower cost regulators have a wider degree of accuracy and response time than premium and precision air regulators. Air pressure regulators are used for controlling pressure to a whole variety of pneumatic tools, and typically are available as either type:.
Relieving type regulators allow for high pressure to be adjusted to low pressure even in dead-end situations. On the contrary, non-relieving valves do not allow the excess downstream pressure to be relieved into the atmosphere.
But, you need to still release this trapped air somewhere right? So, a downstream valve would need to be introduced. General-purpose regulators can be expected to maintain an average pressure level range within a plus or minus PSI. Precision regulators can usually hold a line pressure within plus or minus 0. If you need a precision pressure setting for an application, know your pressure variation tolerance, and inform the regulator supplier, to make sure you get one that works for you.
And yes, precision regulators are more expensive than general-purpose regulators. Larger pressure regulators can be air-piloted, and slaved, to smaller, remotely installed, regulators that allow pressure adjustment of a regulator in a hostile environment by one that is installed in a more benign location.
Regulators can be supplied with accessories such as locks, are supplied with or without gauges, are available in electronic formats, and in a host of configurations for specific applications. The simplest and least expensive type of air regulators use an unbalanced-poppet-style valve.
This design does not have a separate diaphragm chamber is non-relieving and incorporates an adjustment spring. When the adjustment screw or regulator knob is turned at the top of this regulator to adjust air compressor pressure, the spring is compressed, forcing the diaphragm to move and thus pushing a poppet to uncover its orifice plate. The poppet throttles the orifice opening to restrict the flow and produce the desired amount of downstream pressure. As the pressure rises downstream, it acts on the underside of the diaphragm, balancing it again the force of the spring.
These types of larger and more expensive regulators incorporate a separate diaphragm chamber. A diaphragm chamber pressure regulator consists of an aspirator tube that is exposed to the output pressure. As flow increases through the regulator, this tube creates a slightly lower pressure in the diaphragm chamber, causing the diaphragm to deflect downwards and open the orifice without significantly reducing the output pressure.
This style of pressure regulator has minimal pressure drop across it. Larger diaphragms having increased response and sensitivity compared to smaller diaphragms. Another type of air compressor pressure regulator is the balanced poppet, which tends to have the same design as a separate diaphragm type but has a larger orifice to allow for greater airflow. In order for them to maintain good stability, the poppet is pressure balanced. This pressure balance cancels out the fluctuations of output pressure helping to improve response and sensitivity.
A final type is the precision regulator, which often employs several isolated diaphragms which act against the flapper valves and nozzles in a balancing principle.
Precision types of regulators are normally manufactured in limited flow capacities with smaller connection ports. To correctly size a regulator for your desired applications, the downstream equipment flow, and pressure requirements must be determined.
Selecting the best type of regulator for your specific application will first require you to go over these styles mentioned. All air compressor equipment should have a minimum of three feet of clearance on each side.
This is important for free air cooling and heat exchange on a daily basis as well as maintenance in the future. Every air compressor is different, so ask your service professional how much access space will be needed above and around your particular model. Whether indoors or outdoors, your compressor will need access to electricity. Before plugging it in for the first time, ensure that your compressor voltage is compliant with the socket to avoid blown fuses or fires.
The compressor should have a moisture separator. The dryer should have a pre-filter and an after filter. And the receivers should be sized based on the CFM of the compressors. Below is a typical example of an air compressor setup diagram. Between the inlet valve, pistons and tank, certain amounts of moisture can get through in the compressed air. For applications such as sanding, painting and blowing, moisture and lubricant can be problematic.
Therefore, an air compressor should be equipped with a filtration device at the air outlet. This will prevent condensation from diluting certain pneumatic applications and also stop lubricants from ruining paints and finishes.
The two devices can be linked with a short airline between the outlet of the dryer and inlet of the separator. For overhead applications in crowded workspaces, additional setup features can solve the problem of dragging hoses. If you intend to work on cars within your garage, for example, hoses could be an inconvenience as you circle vehicles from front to back. To prevent pulls and entanglements, consider installing an overhead apparatus that will link at the far end to your compressor and at the near end to your tools.
The apparatus can be set up as follows:. There are a variety of applications that can be performed with a garage-based compressed air system. From cutting and sawing to nailing and riveting. These tasks would otherwise require considerable hand coordination and arm strength but can now be accomplished quickly with pneumatic tools, which can be powered by portable, compact, vertical or horizontal air compressors.
However, the compressor you choose must provide sufficient cfm capacity combined for every tool you intend to employ in your arsenal. The following common garage-oriented pneumatic tools — all of which require 90 psi — generally correspond with the following cfm requirements :. Air tools make it possible to perform complicated, heavy-duty tasks in just a fraction of the time it would take to perform such tasks with manual tools.
I found a different pressure regulator assembly with the same plastic piston. Thanks in Advance. To Sam: check your resale- flea markets for a similar unit with same regulator that you can pick up for a few dollars and donar the parts from. Unfortunately, my rubber seat had disintegrated due to age so I had to fabricate one from a rubber plumbing seat used in older faucets.
I will follow up with this repair to make it better. Hi Dave. I have a Hitachi ecs compressor with the same regulator shown here, above. The top white disc that includes the nipple and that is part of the plastic piston on my regulator originally seemed pressed onto the piston assembly. However, in my case, that same disc with the nipple has separated from the rest of the piston.
Although the disc seats well on top of the rest of the piston, the regulator now leaks air when attempting to dial in a pressure. Amazon and the Amazon logo are trademarks of Amazon. Want to brag about your gorgeous compressor rebuild? Remove Regulator by using Crescent Wrench and turning hex nut counter-clockwise. Regulator Control Knob removed. Reassemble the above regulator parts. Clean inside of compressor manifold.
The regulator Tank Pressure Seat. Regulator rubber seat from the compression spring. Disassembled regulator and spring. Notice depth of the notches in the regulator seal. Grooves in regulator seal. Next Melben Air Compressors.
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