Brochure

Parker Hannifin Corporation
Climate & Industrial Controls Group
Cleveland, OH
Flo-Con Pressure Regulators and Valves
346
Catalog CIC-2003-1/US
Abbreviations and Terminology
Abbreviations and Terminology
Abbreviations
A (Amp) Ampere
BTU/hr British Thermal Units per Hour
BTU/min. British Thermal Units per Minute
°C Degrees Celsius or Centigrade
cm
2
(sq. cm) Square centimeters
CPR Crankcase Pressure Regulator
CSA Canadian Standards Association
°F Degrees Fahrenheit
EPR Evaporator Pressure regulator
ft (') Feet
in (") Inches
hg Mercury
Hz Hertz (frequency, cycles per second)
ID Inside diameter
kcal/h Kilocalories per hour
kg Kilogram
kg/cm
2
Kilogram per square centimeter
kw Kilowatts
lbs Pounds
lbs/min Pounds per minute
m Meter
m
3
/h Cubic meters per hour
mm Millimeter
mm hg Millimeters mercury equivalent vacuum
MOPD Maximum Opening Pressure Differential
NEMA National Electrical Manufacturers Association
NPT National Pipe Thread
OD Outside Diameter
ODS Outside Diameter Sweat or tubing O.D.,
which can be soldered into fitting
psi Pounds per square inch
psig Pounds per square inch gauge
sq. cm (cm
2
) Square centimeters
SWP Safe Working Pressure
TXV Thermostatic Expansion Valve
UL Underwriters Laboratories, Inc.
V Volts
Explanation of Terminology
Design pressure (SWP): The maximum allowable
working pressure for which a valve or regulator
is designed.
Evaporator temperature: Saturated temperature
in the evaporator.
Maximum fluid temperature: The highest
normally allowable internal temperature for
a particular valve.
Maximum Opening Pressure Differential: The
maximum difference between the pressure at
the valve inlet and the pressure at the valve
outlet at which a solenoid will open consistently
(MOPD).
Minimum fluid temperature: The lowest normally
allowable internal temperature for a particular
valve assuming a clean, oil-free fluid and the
absence of thermal or pressure shock.
Net weight: The weight of a particular valve. Does
not include shipping cartons.
Pressure drop: The pressure difference between
the pressure at the valve inlet and the pressure
at the valve outlet.
Shock: A sudden, violent increase in pressure;
can be caused by a rapid change in tempera-
ture, pressure, velocity, or direction.
Valve or regulator capacity: All capacities are
maximum for the conditions listed at each
table. No “reserve capacity” is included in this
catalog.
Conversions to metric:
1 ton = 200 BTU/min
1 ton = 3024kcal/hr
1 kw = .2844 ton
1 kw = 56.89 BTU/min
1 kw = 860 kcal/hr
1 bar = 1.0197 kg/cm
2
1 bar = 14.5 psi
1 ATM = .98 bar = 14.7 psi
Control Valve Symbols and Functions