RS S81 Quick Start Manual

S81,S82 Solenoid Valve
Port 9mm (3/8") to 66mm (2-5/8")
FEATURES
•Pilot Operated
•Interchangeable Capacity Cartridges
•Low Pressure Drop
•Manual Opening Stem
•All Service From The Top
•Sweat-in-place Without Disassembly
•Maximum Opening Pressure Difference (MOPD):20.7
bar (300 psig)
•Design Pressure (MRP): 31.0 bar (450 psig)
•Molded Class "H" Coil Construction
•Pilot Light and QD Coil Assemblies available
DESCRIPTION
The new S8 series of commercial solenoids
were developed by the Refrigerating Specialties Divi-
sion of Parker Hannifin as a versatile, all purpose valve
in a wide range of port and connection sizes. With car-
tridge (port) sizes available up to 66mm (2-5/8"), S8 so-
lenoids are capable of handling greater flow rates than
competitive valves with similar non-flanged body styles.
In addition, this unique design incorporates the same
concept of cartridge interchangeability as found inthe
A8 series of regulators. This innovative design actually
utilizes the same capacity cartridges (and valve bodies)
as those used in the A8 regulator series, as well as the
same solenoid actuator, coil, and coil housing. Capac-
ity cartridges can be changed by simply unscrewing the
valve's four adapter bolts to facilitate the removal of the
adapter and cartridge assemblies. With this flexible line
of commercial solenoids now supplementing the exist-
ing line of A8 regulators, a wide variety of control valves
designed for commercial applications are now available
from a single reliable source. This ductile
Fig 1
Refrigerating Specialties Division
S81, S82
050415
iron-bodied solenoid valve with brazed copper couplings
is suitable for most common refrigerants, certain oils
and other fluids approved for use in refrigeration. This
valve may be opened by means of a manual opening
stem in case of electrical power failure or for servicing.
ORDERING GUIDE
Like the R/S line of A8 pressure regulators, the
new S8 solenoids are available in a number of port and
connection size combinations. When ordering, please
indicate both the port and connection size required
along with the coil voltage.
PRINCIPLES OF OPERATION
The Type S81 is a pilot operated solenoid. In
Figure 1, the valve is shown in its closed position with
the solenoid coil de-energized and the plunger and
piston plug in the seated position. When the solenoid
coil is energized, it forms a magnetic field that pulls up
the plunger, lifting it off its seat. Upward motion of the
plunger permits entrance of the fluid from the valve inlet
through the adapter and down through the pilot port to
the top of the piston. This forces the piston downward
and pushes the main port plug open, thereby permitting
flow of the refrigerant through the valve. The closing
spring meanwhile is held in a compressed position. De-
energizing the solenoid coil permits the spring-assisted
plunger to reseat, stopping the flow through the pilot
port. Bleed-off, through the bleed hole in the piston,
decreases the pressure above the piston and allows
the closing spring to force the main port plug upward
into a closed position to stop the flow. The pressure
difference across the valve, acting up on the area of the
valve seat, plus the force of the closing spring, holds the
mainport plug in a tightly closed position.
1
ISO 9001-2000 CERTIFIED
March 2006
32-00A