The liquid ring compressor is a positive displacement compressor, which directly depends on changing the gas volume to increase the gas pressure. The characteristics of the liquid ring compressor are simple structure, easy manufacture, simple operation, few wearing parts, and small exhaust pulsation and noise. In addition, the liquid has a sufficient cooling effect, and the final temperature of the compressed gas is very low, so the liquid ring compressor is suitable for compressing gases that are easily decomposed at high temperatures, such as acetylene, carbon sulfide, hydrogen sulfide, etc. Because the compressed medium is not in direct contact with the cylinder, the liquid ring compressor is also particularly suitable for compressing highly corrosive gases (such as chlorine). In this case, a liquid that does not work with the compressed gas can be used as the sealing liquid, such as concentrated sulfuric acid when compressing chlorine gas.
Compressor commonly used pressure unit conversion:
1MPa (Megapascal) = 1000kPa (kPa) = 1000000Pa (Pascal)
1bar (bar) = 0.1MPa
1atm (standard atmospheric pressure)=0.1013MPa=1.013bar=760mmHg =10.33mH2O
1kgf/cm2 (engineering kilogram force)=0.981bar=0.0981Mpa
1psi(Lb/in2)=0.07031kgf/cm2=0.06893 bar=6.893kpa
1MPa=145psi
Psi (lb/in2) pounds per square inch
So what pressure can a liquid ring compressor achieve?
Before that, we need to clarify the difference between “gauge pressure”, “absolute pressure” and “differential pressure”:
Absolute pressure: Absolute pressure refers to the total pressure acting on the surface area of an object, and its zero point is based on absolute vacuum, also known as total pressure or total pressure, abbreviated symbol “abs.”.
Gauge pressure: refers to the total pressure acting on the surface area of an object, and its zero point takes the local atmospheric pressure as the reference point. Shorthand notation “G.”.
Differential pressure: The difference between any two pressures is called differential pressure. Such as static pressure liquid level gauge and differential pressure flowmeter are used to measure the size of the differential pressure to measure the size of the liquid level and fluid volume.
Absolute pressure = relative pressure (gauge pressure) + atmospheric pressure;
Gauge pressure = absolute pressure – atmospheric pressure > 0;
Differential pressure is the relative difference between the pressures of the suction and exhaust ports Δp = p1 – p2
In the industry, the pressure of the liquid ring compressor is usually expressed as the differential pressure, that is to say, when the compressor is working normally, the pressure difference between the Suction and Exhaust measured by the pressure gauge is calculated.
The liquid ring vacuum compressor developed and produced by EVP VACUUM SOLUTION can achieve a pressure of 15bar G. The following are some typical compressor models and the achievable differential pressure value
Single stage compressor:
2BV series compressors can achieve 0.5bar G.
2BE series compressors can achieve 1.5bar G.
SY series compressors can achieve 3bar G.
Two-stage compressor:
2SY series compressors can achieve 6Bar G.
LRC series compressors can achieve 7barG. LRV Series connection can achieve 15barG.
The liquid ring compressor is the same as the liquid ring water ring pump, It is a customized product. EVP VACUUM SOLUTION can design and provide different solutions based on the different requirement of customers .
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