Parker A4W Series, Installation, Service And Parts Information

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Refrigerating Specialties Division
9
TROUBLE SHOOTING SUGGESTIONS
SYMPTOM PROBABLE REASON CORRECTION
Regulator does not
Diaphragm or Pilot Seat dirty, damaged Clean or replace. Clean strainer.
shut off fl ow.
or frozen.
Diaphragm follower stuck or damaged. Clean or replace. Install follower carefully.
Piston jammed with excess dirt. Remove Piston and clean dirt from Seal Ring and groove.
Clean bore with crocus cloth. Clean valve and strainer.
Modulating plug leaking due to excess dirt Clean or replace Modulating Plug and or Valve Seat.
or damage.
Diaphragm and Pilot Seat Replace. Reduce fl ash gas by reducing amount of liquid in suction
eroded due to fl ash gas. line. For example, reduce rate of liquid overfeed.
Regulator does not Diaphragm ruptured Replace. If Range D make sure two
open. or badly deformed. diaphragms are installed.
Diaphragm Follower stuck, damaged Clean or replace.
or frozen. Install follower carefully.
Piston Seal Ring worn or torn. Replace Seal Ring. Check for reason.
Regulator Operation
Diaphragm or Pilot Seat dirty
Clean or replace. Clean strainer.
erratic.
or damaged.
Diaphragm Follower has dirt on the outside Clean or replace.
diameter or outside diameter is damaged.
Other system components, line controllers, Adjust, repair or replace.
thermostats, etc., erratic.
Regulator too far oversized. Check load. Replace with smaller regulator. If load has wide
variation, consider using two smaller regulators in parallel. Check
with factory.
Pressure drop across Inlet or outlet restricted. Check for restriction.
regulator too high. Clean strainer.
Regulator too small. Replace with properly sized regulator.
High pressure drop causes high rate of Increase pipe size at the outlet of the
expansion gas at regulator outlet. regulator.
Regulator does not open all of the way. Check Piston Seal Ring for wear.
Replace and determine cause for wear.
PORT SIZE
Parts Kit Number
and Part Quantities
Item No. Description and Contents 125mm 150mm 200mm
(5”) (6”) (8”)
Seat Kit, Main Valve 201534 201535 201536
2 Seat, Valve 1 1 1
3 O-Ring 1 1 1
4 Screw, Hex Head 1 1 1
5 Gasket 1 1 1
6 Wrench, Seat 1 1 1
Plug Kit, Modulating 201537 201538 201539
7 Plug, Modulating 1 1 1
8 Spring 1 1 1
H Seat Kit, Main Valve 1 1 1
(See Above)
Piston Kit 201540 201541 201542
9 Piston Stem 1 1 1
10 Ring, Seal 1 1 1
5 Gasket 1 1 1
Stem Kit, Opening 201546 201547 201548
11 Stem, Manual Opening 1 1 1
12 Nut, Packing 1 1 1
13 Packing, Stem 1 1 1
14 Washer, Flat 1 1 1
5 Gasket 1 1 1
PORT SIZE
Parts Kit Number
and Part Quantities
Item No. Description and Contents 125mm 150mm 200mm
(5”) (6”) (8”)
Cap Kit, Seal 201549 201550 201551
15 Seal Cap 1 1 1
16 O-Ring 1 1 1
Bolt Kit 201552 201553 201554
17 Bolt, Hex Head 6 10 16
18 Nut 8 12 16
19 Stud 2 2 0
5 Gasket 1 1 1
Gasket Kit 201558 201559 201560
3 O-Ring 1 1 1
5 Gasket 1 1 1
16 O-Ring 1 1 1
45 Gasket 1 1 1
10 Ring, Seal 1 1 1
Adapter/Cover Kit 202861 202484 203099
59 Adapter/Cover 1 1 1
5 Gasket 1 1 1
43 Gasket 1 1 1
21 Plug, Pipe 1 1 1
13 Packing 1 1 1
Parts Kits Which Are Exclusive to Each
Port Size Type A4W Regulator