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PNEUMATICALLY COMPENSATED
INLET PRESSURE REGULATORS
TYPE A4AP-DN, A4A3P-DN
Port Size 3/4"- 4" (20 - 100 mm)
For Ammonia, R22, R134a, R404a, R507
Other Refrigerants and Oils
FEATURES
• Pilot operated characterized Modulating Plug for
precise control
• Suitable for all common refrigerants and oils
• 406 psig (28 bar) design pressure (PS)
• Flanges for threaded or welded steel pipe and copper
tube (copper not for ammonia)
• Unique modular construction
• Interchangeable parts
• Easy to service
• Close coupled strainers, optional
• Stainless Steel Diaphragm
• Manual opening stem
• Complies with Pressure Equipment Directive 97/23/EC
Pressure Ranges:
• A: 0-150 psig (0-10 bar)Standard
• D: 75-280 psig (5-19 bar)A4AP only
• V: 20 in. hg-120 psig (500 mm hg- 8.3 bar)
Fig. 1 A4AP
Refrigerating Specialties Division
310216
BULLETIN DN23-08B
Type A4AP-DN, A4A3P-DN
A4A3P-DN
January 2007
Installation and Service Information
Description
All A4 type regulators are pilot operated using upstream
pressure for the opening force and require a minimum 2
psi (0.14 bar) pressure drop to fully open.
These valves are generally ordered with close coupled
upstream strainer to prevent entrance of foreign
material into the valve and the rest of the system.
Purpose:
These pneumatically compensated inlet pressure
regulators modulate the flow of refrigerant gas or liquid
to maintain a varying upstream (or inlet) pressure in
response to a pneumatic signal received from a
pneumatic controller. The regulator set-point will be
directly varied, on a 1:1 basis (A4AP) or 3:1 basis
(A4A3P), with value of the air pressure supplied to the
bonnet. Thus a pneumatically compensated regulator,
by responding to the varying output air signal from a
pneumatic controller, can change the evaporator
pressure and temperature up and down to match a
varying load condition. A 1 psi increase in air pressure
will increase the set point by 1 psi for the A4AP and 3
psi for the A4A3P. Generally, the pnuematic controller
modulates the air pressure from 3 to 15 psig throughout
its control range.
1
I S O
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C E R T I F I E D
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Summary of Contents for Parker A4AP-DN
- Page 1 PNEUMATICALLY COMPENSATED BULLETIN DN23-08B INLET PRESSURE REGULATORS Type A4AP-DN, A4A3P-DN TYPE A4AP-DN, A4A3P-DN Port Size 3/4"- 4" (20 - 100 mm) For Ammonia, R22, R134a, R404a, R507 Other Refrigerants and Oils FEATURES • Pilot operated characterized Modulating Plug for precise control •...
- Page 2 In addition to the standard "P" or "3P" version, other set-point. The inlet pressure is not appreciably affected regulator variations can be combined along with the by variations in the outlet pressure. pneumatic variation to perform more than one control function.
- Page 3 turn the adjusting stem in (clockwise) until the pres- is easily accessible for adjustment and maintenance. sure gauge shows a slight rise in the inlet pressure. The location should be such that the regulator can not At this point the adjusting stem may be turned in to be easily damaged by material handling equipment.
- Page 4 polishing the piston, bore and modulating plug with regulator malfunction. All screens or filters must be fine crocus cloth. Inspect the seating area of the cleaned or replaced when they become dirty. At start Modulating Plug 33 for damage or erosion. If dam- up it is especially important that these items are aged it should be replaced.
- Page 5 valves isolating such sections should be marked, warning against accidental closing, and must not be Avoid all piping or control arrangements which might closed until the liquid is removed. Check valves produce thermal or pressure shock. must never be installed upstream of solenoid valves, or regulators with electric shut-off, nor should hand For the protection of people and products, all refriger- valves upstream of solenoid valves or downstream of...
- Page 6 For replacement parts and prices, consult PARTS KITS LIST PRICE SCHEDULE INDUSTRIAL Item Description AND FLO-CON (PK) Seal Cap Gasket, Seal Cap Nut, Stuffing Box Packing Ring Packing Washer Adjusting Stem Bonnet Nameplate Screw, Name Plate Screw, Bonnet Spring Rest, Upper Spring, Range Spring Rest, Lower Diaphragm Follower...
- Page 7 products which have been altered, or repaired in the Warranty field; damaged in transit, accidents, misuse, or abuse. Products disabled by dirt or other foreign substances All Refrigerating Specialties products are warranted will not be considered defective. against defects in workmanship and materials for a period of one year from date of shipment from originat- ing factory.
- Page 8 1/2"-13 Bottom Cap Bolt 1-5/8" - 2-1/2" 50 ft lb 5/8"-11 Bottom Cap Bolt 3"-4" 75 ft lb Parker Hannifin Corporation • Refrigerating Specialties Division Refrigerating Specialties Division 2445 South 25th Avenue • Broadview, IL 60155-3891 Telephone (708) 681-6300 • Fax (708) 681-6306...
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