Brochure

Page 4 – Bulletin 110-10
Independent
Suction
Oil Separator / Reservoir
OF-303, OF-303-BP
or ROF-413-T Oil Filter
Y1236-C
Common Discharge Header
To Condenser
Oil Level Controls
Common Suction Header
Figure 2
High Pressure Oil Return System
DESIGNING THE HIGH PRESSURE OIL
RETURN SYSTEM
High pressure oil return systems are fabricated slightly different
than low pressure oil systems, but they achieve the same result
of supplying oil to the compressor. Both types of systems are
used within the industry.
The oil separator used on the high pressure systems is designed
to also serve as an oil reservoir. The oil in the reservoir is at a
discharge pressure. This pressure must be reduced to a pressure
slightly higher than the compressor crankcase so that it can be
managed by the oil level control. This can be accomplished by
using the Y1236‑C Pressure Differential Valve.
SYSTEM COMPONENTS
Y1236-C PRESSURE DIFFERENTIAL VALVE
The Sporlan Y1236‑C Pressure Differential Valve is designed for
use on high pressure oil return systems or others applications
where a differential pressure regulator is required. The valve
permits the Oil Level Control mounted at the compressor to feed
at any spec if ied level because the pressurized oil at the control is
slightly greater than crankcase pressure. Without the Y1236‑C,
excessive pres sure drop across the mechanical oil level control
would cause the control to overfeed the compressor. This occurs
because more force is required on the float ball, thereby a higher
oil level, to overcome the pressure drop through the port to close
the oil level control.
The Y1236‑C reduces the inlet pressure by controlling a differen ‑
t ial across the valve outlet and the force supplied to the valve’s
element. With high pressure oil return systems, suction pressure
is supplied to the element when located between the oil separa‑
tor/reservoir and the oil level control. The valve is adjustable from
a 10 to 25 psi (0.69 to 1.7 bar) differential. Turning the adjust‑
ment stem counterclockwise reduces the differential. One turn
of adjustment is equal to 2.5 psi (0.18 bar) change. The standard
differential setting from the factory is 17 psi (1.2 bar).
The Y1236‑C includes a removable 100 mesh inlet strainer to
pro tect the valve from circulating contaminants. The removable
strainer can be purchased separately (p/n: 1538‑000).
1.93" (4.90 cm)
2.02" (5.13 cm)
1.62"
(4.11 cm)
1.35"
(3.43 cm)
0.97"
(2.46 cm)
2.43" (6.17 cm)
6.10" (15.49 cm)
3/8" SAE Flare
(Outlet)
3/8" SAE
Flare
(Inlet)
1/4" SAE
Flare
Figure 3
Y1236-C Pressure Differential Valve