air compressor rated pressure 7kg is what does that mean?

In simple terms

"7kg" refers to this air compressor maximum gas pressure capable of continuous and stable output it is equivalent to 7 kilograms of thrust per square centimeter of area. You can imagine it as pumping up the tires and hitting a certain level of immobility. The "immobility" drive is the embodiment of pressure.

For example: just like you push a door with your hand, the pressure of 7kg is about the same as that of 7kg of strength to firmly press on the door, and the door does not move-this is the upper limit of the "hard work" of this machine.

What is this pressure enough?

In general, the pneumatic wrench, paint spray gun, soot blowing and pneumatic valve in the factory can basically cope with the pressure of 7kg. However, if it is an occasion that requires special strength, such as large-scale injection molding or some special processes, it may not be enough.

How does the water lubricated air compressor participate in this?

If this 7kg pressure air compressor uses water lubrication technology the way it works is very interesting-the inside of the machine does not use oil to help seal and cool down, but directly uses water to complete these tasks.

Specifically:

• when compressing air the water will form a layer of water film between the rotor and the cavity, separating the two metal surfaces, not only preventing them from direct friction, but also taking away the heat generated by compression.
• The gas that comes out there will be some water vapor inside, but because there is no oil involved in the entire compression process, the air coming out is very clean and there is no need to worry about oil pollution.
• When the machine is running, water circulates continuously in it, cooling while lubricating, just like adding coolant to the engine, but the "coolant" here is also doing the work of lubricating oil.

Why care about this 7kg?

Because this is the one the manufacturer told you. "Promise Value"-- The machine can work for a long time and without stopping under this pressure, without overheating or problems. If you exceed this value to use, the machine will be difficult and its life will be shortened.

Just like a car's manual says "maximum load 500kg", you can't run with 600kg, but tires and brakes are easy to break down after running for a long time.

One sentence summary

7kg is the upper pressure limit for this air compressor to "work steadily". And if it is water-lubricated, then while outputting this pressure, it can also protect itself without oil, clean gas, and rely on water inside, which is especially suitable for places that require air quality.