Why named heavy duties?
Heavy duty compressor has follows features than normal compressor:
1.Long working time,constant working tims more than 16 hours every day
2.Suitable for dirty working enviroment ,this require compressor has good radiator to cool itself   temperaure,keep in good condition
3.Low speed,and big crank case,good dynamic balance :Low speed (around 600-800rpm)mean long working life for compressor,big crank case and good dynamic balance can keep compressor working at smooth and steady condition,this is very good for compressor working life
4.Good bearing,this is heavy duty features
5.Intake valve Assembly instead of intake valve strip,long working life,and quality performance
6.Enough air delivery volume,also this show compressor cost performance and if the compressor save energy or not.Every heavy duty compressor has enought air delivery as its stated etc---
  The compressor technical data as follows;
 

Model	HD-0.53/12.5
Power(Hp,Kw)	5.5,4, 3 PHASE
Working Pressure(Bar,Psi)	12.5,180
Air Delivery(L/min,CFM)	530,18.7
Cylinder(diameter × piece)	Ф105×1,Ф55×1
Tank(L)	300L
Speed(r.p.m)	860
Net Weight(Kgs)	210
Meas(L×W×H ,Cm)	150×52×110