Brochure

Catalog CIC-2003-1/US
Refrigeration Solenoid Valves
Parker Hannifin Corporation
Climate & Industrial Controls Group
Cleveland, OH
265
Refrigeration
Solenoid Valves
Technical Information Jackes-Evans Refrigeration Solenoid Valves
Jackes-Evans Refrigeration
Solenoid Valves (RB/ORB Series)
Refrigerant Solenoid Valve Features
Stainless
steel
plunger
Totally encapsulated
Class F coil, UL
Listed, CSA
Certified
Pivoted-edge
diaphragm operation
for lower pressure
drop
Available in extended
end copper, sweat, flare
and pipe connections
Manual bypass
for simple
system
evacuation
PTFE diaphragm for reliability,
long life, tight seating
Solenoid Coil Operation
Magnetic
Field
Attractor
Coil
Plunger
Frame or
coil housing
Pilot Operated Valve, Normally Closed Shown
Coil De-energized, Valve Closed Coil Energized, Valve Open
Coil
Equalizer
Orifice
Plunger
Closed
Diaphragm
Pilot Orifice
Coil
Equalizer
Orifice
Plunger
Diaphragm
Pilot Orifice
Open
Direct Operated Solenoid Valve, Normall Closed Shown
Coil De-energized, Valve Closed
Plunger
Attractor
Coil
Return
Spring
Orifice
Plunger
Coil
Return
Spring
Attractor
Orifice
Coil Energized, Valve Open
Note: Parker Jackes-Evans refrigeration solenoid
valves are being discontinued. For all new
applications, see pages 229-262 of this catalog
for new and improved R Series refrigeration
solenoid valves. See page 267 for the R Series/
Jackes-Evans Cross Reference chart.
Operating Principles
What is a Solenoid Valve?
The solenoid valve is an electronically operated
device. It is used to control the flow of liquids or
gases in a positive, fully-closed or fully-open mode.
The valve is commonly used to replace a manual
valve or where remote control is desirable. Solenoid
valves are operated by a variety of electrical
switches. Among them are automatic temperature,
pressure and time switches or manual switches.
When energized, the solenoid coil provides a strong
magnetic force which pulls a steel plunger up into
the plunger tube. This opens the valve orifice in a
normally closed valve, permitting the flow of liquids
or gases.
Two-Way Solenoid Valves
Two way valves control flow in one direction. They
may be direct operated or pilot operated, normally
closed or normally open.
Direct Operated Solenoid Valves
(See illustration at the right.)
Are used in systems requiring low flow capacities
or in applications with low pressure differential
across the valve orifice. The sealing surface that
opens and closes the main valve orifice is con-
nected to the solenoid plunger. The valve operates
from zero pressure differential to maximum rated
pressure differential (MOPD) regardless of line
pressure. Pressure drop across the valve is not
required to hold the valve open.
Pilot Operated Valves
(See illustration at the right.)
Pilot operated valves are the most widely used
solenoid valves. The pilot orifice is much larger than
the equalizer orifice. When the coil is energized, the
plunger lifts off the pilot orifice. The pressure above
the diaphragm is reduced to the outlet pressure
of the valve. The resulting pressure differential
across the diaphragm creates a force which lifts
the diaphragm off the main port, opening the valve.