HA4A STANDARD REGULATOR
OPERATION
Inlet pressure is channeled through the internal
equalization passage to the inlet pressure control
module. The valve modulates open when inlet pressure
exceeds the pressure setting on the control module.
The gas or liquid passes through the inlet pressure
control module to enter the space on top of the piston,
which forces the main valve seat to open and regulate
flow. As inlet pressure increases, the main valve seat
opens further to maintain the selected inlet pressure. A
minimum pressure difference of 2 psi (0.14 bar) is
adequate to fully open the main valve. When inlet
pressure decreases below the pressure setting on the
control module, the closing spring will cause the main
valve seat to throttle closed.
ADJUSTMENT
Connect a pressure gauge via a gauge valve at the
gauge port on the regulator adapter. Set the control
module range spring at minimum force (control module
stem turned counterclockwise). Operate the
refrigeration compressor system and achieve
approximate desired suction pressure. Turn the control
module stem clockwise until a slight increase in inlet
pressure is detected by the gauge. The inlet pressure
setting can now be increased by turning the control
module stem clockwise or decreased by turning it
counterclockwise. The system should be allowed to
operate for a period of time before the final adjustment
is made. The inlet pressure control module is available
in Range A, 0 to 150 psig (0 to 10 bar); or Range B, 30
to 300 psig (2 to 21 bar). A vacuum Range V, 20" to 130
psig (–0.67 to +9 bar) is also available.
HA4AK RESEATING RELIEF
REGULATOR
OPERATION
(Same as HA4A) Inlet pressure is channeled through
the internal equalization passage to the reseating relief
control module. When inlet pressure exceeds the relief
setting, the control module opens wide to allow
pressure to enter the space on top of the piston. This
causes the main valve seat to open and relieve the inlet
pressure, provided the outlet pressure is at least 2 psi
(0.14 bar) lower. A 5 psid (.35 bar) closing spring is
standard on ¾" through 1¼" valves. See page 6 for
M3K pilot details.
When used for defrost relief from low side to an
intermediate pressure, a check valve on the outlet is
required to prevent back flow during refrigeration.
ADJUSTMENT
The control module is nonadjustable, factory-set and
sealed. Available in Range A, 0 to 150 psig (0 to 10 bar);
or Range B, 30 to 300 psig (2 to 21 bar).
HA4AL DIFFERENTIAL PRESSURE
REGULATOR
OPERATION
Inlet pressure is
channeled through the
internal equalization
passage to the
differential pressure
control module. Outlet
pressure (or other) is
introduced to the space
on top of the differential
pressure control module
diaphragm via an
external sensing tube. A
range spring on the top
of the control module
diaphragm allows the control of the differential
between inlet and outlet pressure. Increased range
spring force increases the differential setting. Inlet
pressure, counteracted by the range spring plus outlet
pressure, enters the space on top of the piston which
forces the main valve seat to open and regulate flow.
The external sensing tube on the 5" & 6" valves must
be customer supplied and field installed.
ADJUSTMENT
Connect a pressure gauge via a gauge valve at the
gauge port on the regulator adapter for the inlet
pressure reading. A pressure gauge downstream is
also required. With the control module range spring
force at the minimum (control module stem turned fully
counterclockwise, at this point pressure differential is
at minimum), slowly turn the control module stem
clockwise until the desired pressure difference
between the two gauges is achieved. A final adjustment
should be made after system has operated for a period
of time. The system must be capable of generating the
desired pressure difference for the regulator to open.
Range A, 0 to 150 psig (0 to 10 bar).
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