- 🔹 Small Mobile Piston Air Compressor Working Principle
- A piston air compressor uses the reciprocating motion of a piston inside a cylinder to compress air and deliver it at a higher pressure.
1. Intake Stroke
As the crankshaft drives the piston from top dead center to bottom dead center, the volume inside the cylinder increases and the pressure drops.
The intake valve automatically opens due to the pressure differential, drawing atmospheric air into the cylinder.
At this point, the exhaust valve remains closed.
2. Compression Stroke
As the piston moves from bottom dead center to top dead center, the air inside the cylinder is compressed, gradually increasing the pressure.
As the gas is compressed, its temperature also rises.
The intake valve closes, preventing backflow of gas, and the entire cylinder becomes a closed chamber.
3. Discharge Stroke
When the pressure inside the cylinder exceeds the back pressure of the exhaust valve, the exhaust valve automatically opens.
The high-pressure air is pushed out of the cylinder and into the air storage tank or piping system.
Exhaustion ends when the piston reaches top dead center.
4. Cycle Repeats
The piston continues to reciprocate, completing the three stages of intake, compression, and exhaust over and over again, achieving continuous air supply.
🔹 Main Components
Cylinder – The main space where air is compressed.
Piston – Reciprocates within the cylinder, completing the compression process.
Crankshaft – Converts the motor's rotational motion into reciprocating motion of the piston.
Inlet & Discharge Valves – Control the flow of air into and out of the cylinder, opening and closing automatically based on pressure differences.
Connecting Rod – Connects the piston to the crankshaft, transmitting motion.
Flywheel – Maintains uniform rotational speed and aids heat dissipation.
Lubrication System – Reduces friction and extends life.
🔹 Types of Piston Air Compressors
Single-stage
Air is compressed once within a single cylinder, typically to a pressure of 7–10 bar.
Commonly used in small workshops and pneumatic tools.
Two-stage
Air is first compressed in the first-stage cylinder before entering the second-stage cylinder for further compression.
Can reach 20–30 bar, offering higher efficiency.
Mostly used in industrial applications, spray painting, and gas cylinder filling.
Multi-stage
For higher pressure requirements (e.g., above 100 bar), multi-stage compression is required, gradually reducing the temperature and increasing the pressure.
Used in steel mills, chemical plants, diving, military, and other fields.
Specifications
|
Model |
Exhaust pressure |
Capacity |
Cylinder |
Diesel engine/motor |
Dimension |
Weight |
||
|
Length |
Width |
Height |
||||||
|
W-1.8/5 |
0.5 |
1.8 |
100*3 |
S1100 |
140 |
70 |
100 |
320 |
|
W-2/5 |
0.5 |
2 |
115*3 |
S1100 |
165 |
81 |
105 |
450 |
|
W-2.6/5 |
0.5 |
2.6 |
115*3 |
S1110 |
165 |
81 |
105 |
490 |
|
W-2.8/5 |
0.5 |
2.8 |
115*3 |
S1115 |
178 |
87 |
124 |
550 |
|
W-2.8/5-GD |
0.5 |
2.8 |
115*3 |
15KW/20HP |
178 |
87 |
124 |
550 |
|
W-3/5 |
0.5 |
3 |
125*3 |
S1115 |
180 |
90 |
130 |
600 |
|
2V-3.5/5 |
0.5 |
3.5 |
115*4 |
S1125 |
180 |
95 |
130 |
650 |
|
2V-3.5/5-D |
0.5 |
3.5 |
115*3 |
18.5KW/25HP |
180 |
95 |
130 |
650 |
|
2V-4/5 |
0.5 |
4 |
120*4 |
S1125 |
180 |
95 |
130 |
700 |
|
2V-4/5-D |
0.5 |
4 |
120*4 |
18.5KW/25HP |
180 |
95 |
130 |
700 |
|
W-1.8/7 |
0.7 |
1.8 |
100*3 |
S1100 |
165 |
81 |
105 |
450 |
|
W-1.8/7-D |
0.7 |
1.8 |
100*3 |
11KW/15HP |
165 |
81 |
105 |
450 |
|
W-2.6/7 |
0.7 |
2.6 |
125*3 |
S1115 |
178 |
87 |
124 |
480 |
|
W-2.6/7-D |
0.7 |
2.6 |
125*3 |
15KW/20HP |
178 |
87 |
124 |
480 |
|
W-3.2/7 |
0.7 |
3.2 |
125*3 |
S1125 |
196 |
90 |
125 |
550 |
|
W-3.2/7-D |
0.7 |
3.2 |
125*3 |
18.5KW/25HP |
196 |
90 |
125 |
550 |
|
W-3.2/7-ZD |
0.7 |
3.2 |
125*3 |
18.5KW/25HP |
196 |
90 |
125 |
550 |
Product detail
1) It has simple structure and light weight, so it is easy to move.
2) The diesel portable piston air compressor is easy to operate and maintain.
3) High quality air delivery.
4) With advanced technology and low cost.
5) Valve plate and spring bar are made of Swedish special steel and made by special treatment.
6) Piston ring: special design; integral casting; excellent flexibility; lowest lubricant consumption
7) Cylinder: made of boron cast iron; wear-resistant; especially suitable for dusty environment
8) Cylinder head: extruded; streamlined appearance; good heat dissipation performance.
9) Energy efficient.
10) With anti-vibration frame, stable and smooth operation.
11) Professional design and special manufacturing.
🔹 Piston Air Compressor vs. Screw Air Compressor
| Aspect |
Small Mobile Piston Air Compressor |
Screw Air Compressor |
|---|---|---|
| Working Principle | Uses reciprocating piston in a cylinder; piston moves down to intake air and moves up to compress and discharge. | Uses two intermeshing helical rotors (screws); air is trapped between rotors and compressed continuously as it moves along the screws. |
| Structure | Cylinder, piston, crankshaft, valves (inlet/discharge). | Male & female rotors, housing, oil/air separation system. |
| Air Delivery | Intermittent – air is discharged in pulses with each piston stroke. | Continuous – smooth and steady airflow without pulsation. |
| Pressure Range | Can achieve higher pressures (up to 30 bar in 2-stage, >100 bar in multi-stage). | Typically 7–13 bar (can be designed up to 25 bar, but less than piston machines at ultra-high pressure). |
| Capacity (Flow Rate) | Suitable for low to medium capacity (few m³/min). | Suitable for medium to very large capacity (up to hundreds of m³/min). |
| Efficiency | Lower efficiency due to mechanical losses and heat. | Higher efficiency, especially in large-scale continuous operation. |
| Noise & Vibration | Louder and more vibration (due to reciprocating motion). | Quieter, smoother operation (rotary motion). |
| Maintenance | Requires more frequent maintenance (valves, piston rings, lubrication). | Lower maintenance frequency; mainly oil, filters, and separator changes. |
| Service Life | Shorter lifespan if heavily loaded continuously. | Longer service life, designed for 24/7 industrial operation. |
| Initial Cost | Lower purchase price, economical for small businesses. | Higher purchase price, but more cost-effective in continuous use. |
| Best Applications | Small workshops, garages, laboratories, intermittent use, high-pressure needs (e.g., gas filling, PET bottle blowing, diving, military). | Factories, automotive production, textile, food & beverage, electronics, mining, construction – anywhere continuous and stable air supply is needed. |
🔹 Summary
Small Mobile Piston Air Compressor = low flow + high pressure + low cost + intermittent operation.
Screw compressor = high flow + stable air supply + continuous operation + industrial applications.
👉 Simple explanation:
If you need high pressure but only infrequently, choose a piston compressor.
If you need high flow and 24/7 continuous operation, choose a screw compressor.
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