Brochure

Parker Hannifin Corporation
Climate & Industrial Controls Group
Cleveland, OH
Catalog CIC-2003-1/US
354
Industrial Refrigeration Products: Pressure Regulators
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Pilot operated for precise control
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Characterized modulating plug for stable control
under low flow conditions
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Many control variations are possible
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Convertible to other variations
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Optional close coupled strainers up to 100mm (4")
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Manual opening stem
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Easy to service
Description
These compact, heavy-duty, pilot-operated regulators are
suitable for use with Ammonia, R-22, R-134a, R-404A,
R-507 and other common refrigerants and fluids approved
for use in refrigeration systems.
The A4 family of regulators includes valves that control
inlet, outlet or differential pressure. Each regulator is
available with an assortment of additional variations which
enable one regulator to perform several functions. The
most common arrangements are shown on pages 354-358.
Port sizes 20-100mm (3/4" to 4") are flanged body valves.
Port sizes 125 -200mm (5" - 8") are weld end body valves.
Ordering Tips
A4 regulators with variations are normally ordered factory
assembled and tested. However, the A4Z regulators and
the Adaptomode® modules shown on pages 372-374 are
available separately for stock or field conversions.
Flanges are generally ordered with the regulator and are
specified as part of the model number. Male flanges are
provided for both inlet and outlet. Flanges may also be
ordered separately from pages 433-435.
The A4R regulators are available for remote pilot operation.
The pilot regulator (A2B) and pilot solenoid must be ordered
separately.
Variations B, S and D, alone or in combination with other
variations, require a selection of voltage, coil and pilot light.
For variations with two solenoids, each selection applies to
both. Not all voltages are available for each type of coil and/
or pilot light. Refer to the table on page 376 for availability. For
other variations, enter “0” into those fields of the model code.
A4 regulators are generally ordered with an upstream
strainer to prevent entrance of foreign materials into the
valve and the rest of the system.
Back flow through these regulators will occur when outlet
pressure exceeds inlet pressure by several PSI. To avoid
backflow under these conditions, order the check valve
option to install downstream of the regulator.
Regulators will be set to standard set points for the selected
range (see page 349). For variations “K” and “BK”, a
custom setting can be indicated at the end of the model
number by adding the value in PSI preceded by a “-”,
i.e. -100. For Range V, indicate PSI as above, or inches
Hg by adding the setting in inches preceded by “-Hg”, i.e.
-Hg10.
A4 Adaptomode
®
Series
Materials
Body:
20-100mm.................... Gray Iron (ASTM A126 Class B)
125-100mm........................ Cast Steel (A-352 GR, LCB)
Seat.................................................. Lapped Metal to Metal
except A4K 20-32mm (¾" to 1¼") ......................... PTFE
Pilot Seat ............................................ Chrome Plated Steel
Diaphragm ................................ Stainless Steel, Preformed
Specifications
Maximum Fluid Temperature ........................ 105°C (220° F)
Minimum Fluid Temperature:
20-32mm (¾" to 1¼") ................................ -45°C (-50°F)
40-200mm (1
5
⁄8" to 8") ................................ -50°C (-60° F)
Design Pressure (MRP)......................... 27.6 bar (400 psig)
Flow Coefficients
Flanged Body Style
20-100mm Ports
Weld End
Body Style
125-200mm
Ports
Port Flow
Reduced Capacity Plugs
Size Coefficient 50% 35% 17%
Kv (Cv) Kv (Cv) Kv (Cv) Kv (Cv)
20 6.2 (7.2) 3.1 (3.6) 1.0 (1.2)
25 8.6 (10.0)
32 15.0 (17.5) 5.2 (6.1)
40 28.6 (33.4) 10.0 (11.7)
50 42.4 (49.5)
65 60.0 (70.0) 21.0 (24.5)
75 86.0 (100.0) 30.0 (35.0)
100 116.0 (135.0) 41.0 (48.0)
125 171.0 (200.0)
150 308.0 (360.0)
200 471.0 (550.0)
Technical Information