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Page 2 / Bulletin 22-05 A

Port Size

Connection Size 

(SW, BW)

Body Size

Kv

Cv

20 mm (3/4”)

3/4”, 1”

1”

10.8

12.6

25 mm (1”)

3/4”, 1”, 1-1/4”

1”, 1-1/4”

12.5

14.6

32 mm (1-1/4”)

1-1/4”, 1-1/2”

1-1/4”, 2”

22.3

26

40 mm (1-1/2”)

1-1/2”, 2”

2”

30

35

50 mm (2”)

1-1/2”, 2”

2”

41.1

48

A4W Port, Connection, and Flow Coeffi cient Table

A4WO Outlet Pressure Regulator Cross Section 
(1-1/2” Valve Body Shown)

Seal 
Cap

Bonnet 
Assembly

Diaphragm

Outlet 

Pressure 

Passage (N)

Closing 

Spring

Modulating 

Plug (Piston)

Stainless 
Steel Body

Gauge 

Port

Aluminum
Port Plate

Adjustment 

Stem

Passage (T)

Passage (P)

Inlet Pressure 
Passage (N)

Pilot Plug

Description

All A4WO outlet pressure regulators 
are pilot operated and require a 
minimum of 0.14 bar (2 psig) pressure 
drop across the valve to fully open.  
Th

  e valves are an integrated assembly 

of three modules:

A body, which contains the 

1. 

modulating plug, but is ordered to 
suit a particular connection size.  
Th

  e port size defi nes the size of 

the body;

A port plate, which defi nes the 

2. 

valve function.  Control features 
can be added by incorporating 
pilot solenoids: either an Electric 
Shut-Off  (S) or a Electric Wide 
Open Bypass (B);

Th

  e bonnet, which contains the 

3. 

range set spring and adjustment 
stem.

Th

  e A4WO is a normally closed valve 

furnished with socket weld and weld 
neck options only.  Th

  is unique design 

allows the regulator to be welded 
into the line without disassembly, yet 
provides full access for cleaning and 
servicing from the top only.

Th

  ese valves will modulate to maintain 

a pressure as set for in the fi eld, in 
spite of fl uctuations in load, changes 
in ambient, changes in available 
refrigerant fl ow paths, and other 
operating variances.  Appropriately 
sized, these valves will modulate the 
fl ow of liquid or vapor, high side or 
low side in a wide variety of system 
arrangements.  Each port size will 
have a specifi c maximum capacity 
at full opening corresponding to the 
available or sensible-pressure.

Th

  e throttle range on this new design 

is greatly enhanced, resulting in 
optimal performance at low load 
conditions.   Current regulator designs 
can regulate down to 20% of a valves 
maximum rating.  Th

  e A4W series or 

regulators can regulate down to 10% of 
the valves maximum capacity.

Th

  ese valves are generally ordered 

with close upstream strainer to 
prevent entrance of foreign material 
into the valve and the rest of the 

Summary of Contents for A4WO

Page 1: ...eatures are its stainless steel and aluminum construction which allows it to withstand corrosive environments and its overall light weight minimizes installation costs Product Features Suitable for Am...

Page 2: ...ectric Shut Off S or a Electric Wide Open Bypass B The bonnet which contains the 3 range set spring and adjustment stem The A4WO is a normally closed valve furnished with socket weld and weld neck opt...

Page 3: ...n diagram is blocked off at the port plate This passage N is used for the A4W inlet regulator variation and is not required for a standard A4WO outlet regulator A plug is installed at the factory to p...

Page 4: ...gh the pilot plug because the pilot plug piston is fully seated Simply de energize the B feature on the valve to regulate A4WOS Principle of Operation The port plate for the A4WOS is the same port pla...

Page 5: ...are factory set for a given set pressure The seal cap is wired to the bonnet cap screw and the wires are sealed with a lead seal The relief pressure setting is stamped on the seal Note if the lead se...

Page 6: ...weld valves require that the pipe be inserted into the socket until bottomed against the stop The pipe is then to be backed out approximately 1 16 of an inch before welding Use of welding rings is op...

Page 7: ...he pilot assembly 17 21 on an A4WO is required then the compression must be taken off the range spring as described above and the bonnet bolts 4 removed If a solenoid feature is incorporated the solen...

Page 8: ...12 14 18 16 19 20 21 22 23 24 25 26 27 29 31 28 32 30 34 33 23 48 47 46 45 44 35 36 37 38 39 40 41 42 43 A4WO Exploded Parts View A4WOS shown Note The port plate for a A4WO and A4WOE outlet pressure...

Page 9: ...46 49 Port Plate A4WOES Only 208944 208944 208944 208944 208944 35 42 Piston 208778 208779 208780 208781 208782 35 39 Spring Piston 208795 208796 208797 208798 208799 35 39 41 42 Wear Seal Piston 2088...

Page 10: ...0 0 mm 3 54 90 0 mm 3 54 D 266 7 mm 10 5 299 5 mm 11 79 312 7 mm 12 31 E 41 4 mm 1 63 53 1 mm 2 09 49 3 mm 1 94 A4WO Butt Weld BW Dimensions A B C D E Dimension Port Size 20 25 mm 3 4 1 32 mm 1 1 4 40...

Page 11: ...ient temperatures The higher fluid temperatures require lower ambient temperatures for the maximum coil temperature not to be exceeded Conversely low fluid temperatures permit higher ambient temperatu...

Page 12: ...s Division Defective products or parts thereof returned to the factory with transportation charges prepaid and found to be defective by factory inspection will be replaced or repaired at Refrigerating...

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