1. A good compressor valve should
run more than one year under a
normal operating conditions. Short
valve life results in lost production
time and high maintenance cost.
A good manufacturer designs
compressor valves based on
simulation of valve dynamics to
obtain both valve life and
compressor efficiency.
A computer simulation of valve
dynamics will;
Solve valve failure, such as
broken plates, springs.
Improve compressor
performance, reducing horsepower
or increasing capacity.
Reduce rod load and
discharge temperature.
Change or compare
different valve types and get better
compressor performance with
longer valve life.
0
0.03
0.06
0.09
0.12
0 50 100 150 200DC
Lift=0.08"
Lift=0.04"
Reducing lift causes late close
Crank Angle (degree)
SuctionValveDisplacement(in)
Effect of Valve Lift
Figure a
300
600
900
1200
Ps
Pd
0 20 40 60 80 100
Lift=0.040
Lift=0.080
Percent Swept Volume (%)
CylinderP(psig)
Effect of Valve Lift on Compressor HP
Figure b
0
0.015
0.030
0.045
0.060
0.075
100 150 200DC
10 lb/in
50 lb/in
100 lb/in
Crank Angle (degree)
ValveDisplacement(in)
Effect of Valve springs
Figure c