17
power is removed from the solenoid, it will cause the
compressor to unload.
INLET SHUTOFF VALVE UNLOADING - This
unloading method utilizes an actuated valve to close
off inlet fl ow to the compressor, thereby preventing
Actuated Inlet Ball Valve. This valve is wired
and plumbed to the compressor inlet, but still
requires plumbing to gas inlet piping, and a
pneumatic pressure source
Figure 13: Actuated Inlet Ball Valve
Unloading
the compressor from loading. The actuated valve is
either a direct acting electrical solenoid valve, or an
actuated ball valve that uses a three way solenoid valve
to pneumatically operate a ball valve.
Solenoid Valve - A direct acting inlet solenoid shutoff
valve requires very simple wiring/plumbing (see
Figure 12). The valve is a Normally Closed type valve
(compressor is unloaded), that requires an electrical
signal to open (compressor is loaded). Check the side
of the solenoid for the voltage requirement - usually
either 120 VAC or 24 VDC. The Inlet Solenoid is
plumbed between the inlet gas piping and the inlet
to the compressor. The inlet solenoid is specially
sized for the pulsing fl ow requirements of a booster
compressor.
Actuated Ball Valve - The actuated ball valve type of
inlet shutoff valve requires both an electrical signal to
operate, as well as a pneumatic pressure source of
50-150 psig, unless otherwise indicated on the valve
(see Figure 13). Check the solenoid for the voltage
requirement - usually either 120 VAC or 24 VDC. The
port requiring a pressure source will be labeled as such.
Use a minimum of 3/8” tubing of appropriate pressure
rating to connect to the pressure source. All other ports
will be connected. The valve is set to close (unload
the compressor) when there is no power or unloader
pressure present. When the valve is energized and
has a pneumatic pressure source, the valve will open,
thereby loading the compressor. The actuated valve
is specially sized for the pulsing fl ow requirements of
a booster compressor.
SAFETY DEVICES
The following devices may be included with your
Hycomp compressor system (see Figure 14).
However, if they are not included, it is required that they
be installed and properly adjusted, prior to operation
of the compressor. Lack of these safety devices will
void the compressor warranty. In addition, damage
to equipment & personnel may occur if these devices
are not properly installed. Additional safety devices
not listed here may be necessary to properly protect
equipment and personnel.
Temperature Switch – Excessive discharge
temperatures will cause premature failure of compressor
components and will void any factory warranty. All
compressors must have a temperature shutdown
switch placed as near to the compressor discharge as
possible. The switch should be set to shutdown the
compressor just above its maximum normal operating
temperature. Elevated temperatures may be a result
from wear and the fi rst signs of valve and ring failure.
Temperature switches can be used as a detection
method to help prevent unexpected compressor
failures. Discharge temperature switch setting must
NEVER exceed 340 degrees Fahrenheit.
Low Oil Pressure Switch – While oil pressure loss in
the crankcase is a rare event, it can result in extensive
and costly damage to the compressor. A low oil
To Next Page
Loading...