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RADHIKA
TECHNOLOGIES PVT. LTD. undertakes Reconditioning work of
Compressor valves and then Pneumatically testing the same.
The
following procedural steps are under taken.
Ø
The
valves are cleaned completely along with the spares for
decarburization.
Ø
The
depth of valve seat seating areas are checked and re-machined if
the
same are found to be less than the required depth.
Ø
The hardness of Valve Plates & Damper Plates are checked.
The Hardness
acceptance limits - Valve Plates/
37 HRC ; Damper Plates 43 HRC
Ø
Each
individual valve seat is lapped to the required finish.
Ø
All
the reconditioned elements are assembled as a valve assembly and
pneumatically tested for the passing of air at the simulated
working conditions
occurring in the compressor.
Generally the compressor valves are
tested using a solvent, such as kerosene / diesel / petrol etc.
This solvent test reveals only whether the sealing elements are
sealing against the seat at the atmospheric pressure or not. It
does not reveal leakages between the seat and the stop plate
(catcher plate) or around the center bolts. It also can not
reveal leakages that shall occur when the valve shall be
subjected to the working pressures inside the cylinder of the
compressor. It is very important
that these other leakage paths are also checked & sealed.
At RADHIKA
TECHNOLOGIES PVT. LTD.
a special fixture is used to test the reconditioned
valves with air pressure.
The valves are kept in the fixture of the
test bench as they are kept in the cylinder of a compressor.
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The air pressure of
1.04 Kg/cm2 to 4 Kg./cm2 is applied
depending upon
the stage of the valve.
-
The fluttering of
air is used to give the proper seat of valve plate and valve
seat. -
When the continuous
pressure is applied the leakages in the valve is
determined in
terms of cfm.
-
All the valves tend
to leak some what over the passage of time, but a properly
reconditioned valve should give a leakage of less than 3 cfm.
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