Brochure

Catalog CIC-2003-1/US
Distributors and Flow Controls
Parker Hannifin Corporation
Climate & Industrial Controls Group
Cleveland, OH
193
Service
& Check
Valves
Distributors &
Flow Controls
Introduction Refrigerant Distributors
Refrigerant Distributors
Refrigerant distributors are of two basic designs, each
having certain merits that the design engineer may
regard as best for the application. Parker produces both
basic types with the largest range of sizes, variations
and specials of any manufacturer. (Distributors are
made of brass unless aluminum is specified.)
The
nozzle type distributor has a permanent or
replaceable sharp-edged orifice to mix the two-phase
fluid before it enters the coil circuit passageways. By
changing nozzles with different orifice sizes, one body
type may be used for various refrigerants, loads, and
also for different numbers of circuit sizes.
The
Venturi (low pressure drop) distributor has a
machined, contoured throat on the approach side with
diverging circuit holes beyond the smallest section of
the throat. There is no separate nozzle; therefore the
pressure drop is less than the sharp-edged orifice
distributor. The throat size is determined by the number
and size of the circuits and cannot be altered.
Nozzles for orifice type distributors for various suction
temperatures in °F and refrigerants are listed in the
tables starting on page 195. These numbers determine
the hole size.
Venturi Nozzle Type