Pressures switches, type
PR & PRV, are designed for automatically starting & stopping
motors of compressors & pressurized water plants.
COMPRESSOR : The
pressure switches are designed for fitting to the air receiver by means
TYPE PRV : Type
PRV are pressure switches provided with an unloader valve which relieves
the pressure over the compressor piston when the electric motor stops. Hence, when the compressor
restarts, there is no gauge pressure on the compressor piston and
as a result the electric motor life & compressor life
: The stopping pressure is set
by turning the regulating nut (1) and the starting pressure, which
depends on the differential, by turning the regulating screw(2).
Start the plant. when the stopping pressure required is reached,
turn the regulating nut (1) anti - clock wise until the plant
If the plant stops before the pressure required is reached, the
nut should be turned clock wise.
Turning the regulating screw (2) anti - clock wise reduces the
differential (increases the starting pressure) while turning it
clock wise increases the differential pressure.