Unloader/Regulator
Models
22910A-22913A / 22910AR-22913AR
Spare Parts List
Item Part # Description Qty.
1 12112 Valve Body 1
2 12003 Valve Cap 1
3 12004 O-ring, Valve Cap 1
4 12005 Set Screw, Valve Cap 1
5 12016 Valve Stem 1
6 11507 O-ring, Valve Stem 1
7 11508 Back-up ring, Valve Stem 2
8 12015 Piston 1
9 04006 Cup (23mm) 1
Not used on
handwheel version
16
10 04018 Back-up ring, Piston 1
11 12089 Ball, Inlet 1
12 12090 Spring, Outlet Valve 1
12A 12011 Spring, Inlet 1
13 12111 Inlet Adapter 1
13A 12091 Spring Retainer, Outlet Valve 1
13B 12092 O-ring, Spring Retainer 2
14 12093 Outlet Valve 1
14A 12094 O-ring, Outlet Valve 1
15 12095 Seat, Inlet Valve (S.S.) 1
15A 12096 Seat, Outlet Valve (Brass) 1
16 22829 Spring, Silver 19
16 22830 Spring, Yellow 17
16 22831 Spring, Red 17
16 22835 Spring, Orange 15
17 12021 Nut 1
18 12023 Washer, Spring 1
19 12022 Adjusting Nut 1
20 06685 Plug, 1/4" 4
20A 12017 O-ring, Plug 4
21 06686 Spacer Disc, 1.0 mm max. 5
22 06430 Handwheel (optional) 1
The bottom three springs are the same thickness as p/n
22831, but all the springs are painted yellow.
+
When ordering handwheel, add "H" at the end of the unloader/
regulator number.
OPERATING CONDITIONS
Maximum Flow: 13.2 GPM (50 L/min)
Minimum Flow: 1.3 GPM (5.0 L/min)
Max. Temp: 158 oF (70 oC)
Inlet Port: 1/2" FNPT
Outlet Port: 1/2" FNPT
Bypass: 1/2" BSP
Pressure Range
22910A: (Silver Spring) 360-800 PSI (25-55 Bar)
22911A: (Yellow Spring) 360-1450 PSI (25-100 Bar)
22912A: (Red Spring) 360-2000 PSI (25-140 Bar)
22913A: (Orange Spring) 725-3000 PSI (50-200 Bar)
Seal Repair Kit - #12099
Includes
3, 6, 7, 9, 10, 13B, 14A, and 20A
Complete Repair Kit - #09530
Includes
3, 6, 7, 9, 10, 11, 12, 12A, 13B, 14,
14A, 15, 15A, 20A
INSTALLATION & OPERATING INSTRUCTIONS
1) The unloader is to be positioned on the discharge side of the pumping unit.
2) The bottom port (in) receives the pump discharge.
3) The side port (out) is the pressure outlet. Make sure all side ports are tightened securely.
4) The backside port (bypass) redirects the pumped media when the pressure outlet is closed.
CAUTION: The bypass line must always be open. No shut-ff device is permitted on this side of the unloader.
5) The proper sized bypass line can be directed to a holding tank, to atmosphere, or back to the pump inlet.
NOTE: Bypass lines returning to the pump inlet should be equipped with a thermal relief to prevent excessive
heat buildup in the bypass line that can be damaged the pumping system during periods of prolonged bypass.
CAUTION: Improper placement of the accumulator can affect the unloader capacity of your unloader and can
lead to severe system damage and possible bodily injury.
6) If an accumulator is used as a pulsation dampener in your pumping system, the accumulator must be positioned on the
downstream side of the unloader.
CAUTION: A properly sized pressure gauge must be used when attempting to adjust your unloader to its pres-
sure setting. Position gauge between the pump and unloader.
7) Select the proper spring assembly for your Series 22900 unloader. All spring ratings are based on the maximum operating pressure of the respective unloaders in the series. See reverse side for ratings.
NOTE: Cracking pressures at which the unloader is activated can rise 300-400 PSI over rated operating pres-
sures depending on your system.
8) Always adjust unloader springs to system pressure with the system open. Be sure before adjusting that the spray
nozzle orice is properly sized for the volume and pressure you desire and then ne tune the unloader.
Adjusting Pressure:
1) Valve should be tension-free, i.e. loosen nut (17) and adjusting nut (19) so that the piston rod can be moved manually.
2) Spring set and adjusting nut (19) -as well as nut (17) on spiral spring design- are to be tensioned while pump is running
and with open gun (in case of more guns, all have to be open) until required operating pressure is reached and no more
water runs out on bypass side. When the nozzle hole coordinates exactly with ow‑rate and pump pressure, no more
water should run over bypass when required operating pressure is reached.
3) Giant Industries, Inc. strongly recommends the use of a pop-off valve positioned between the pump and the unloader
as a safety backup to unloader malfunction.
IMPORTANT!Ifthenozzleholeistoosmalltoallowalltheuidtorunthroughtheholeaftertherequiredoper-
ating pressure has been reached, on no account is the valve to be adjusted higher than the maximum operating
pressure of the pump. In this case, the bypass is to be left paritally open. Nevertheless, it is advisable to have
suitable nozzles installed.
IMPORTANT! The spacer discs (21, 21A) which are under the adjusting nut (16) are there to keep the adjusted
pressure within limits. These discs are not to be removed.
REPAIR INSTRUCTIONS
Renewal of Piston Seals:
Screw guide plug (2) out of casing and remove hexagon screw (4). Remove piston body (8) by turning counterclockwise
with aluminum pliers or tongs (do not use a hard tool). Cut out worn seals. Carefully slide O-ring (6) an support rings (7)
onto piston rod. Note order of installation. Clip sleeve support ring (10) and sleeve (9) onto piston body. Check casing
surfaces and guide plugs (dirt or damage wear seals out quickly). Fasten piston body onto piston rod with Loctite 270.
Grease all parts lightly with Silicone before reinstalling.
To Check Valves:
Screw out plug (13A) and check whether kickback valve taper (14) or kickback valve plate (14) and kickback valve body
(15A) are worn out. Check O-ring (14A) for damage. Remove spring tensioning disc (13) with taper nose pliers and examine ball (11) and bypass valve body (15) damage. Valve seats can be screwed out with an inserted hexagon key (size 8).
Glue in new valve seats with Loctite 270. Allow to dry for 60 minutes before putting into operation.
DEFECT CAUSE REMEDY
Valve switches Leaky gun. Repair gun.
Giant Industries, Inc.
900 N. Westwood Ave.
Toledo, Ohio 43607
419-531-4600
Fax: 419-531-6836
www.giantpumps.com
repeatedly when
gun is closed.
Worn out kick-back Change kick-back
valve seat or 0-ring. valve seat (15A) and
O-Ring (14A).
Examine valve seat.
Leaky piston rod. Defective O-Ring/ Change piston rod seals
support Ring. (6,7) and examine
surface of guide plugs.
Leaky bypass at Nozzle too small, Install larger nozzle.
nominal pressure. too much water.
Worn out bypass Examine and change as
valve ball. necessary, ball (11), and
bypass valve seat (15).
Pressure gauge shows Valve set too high Turn back adjusting
high pressure above operating nut (19) and hexagon
uctuations when pressure. nut (17).
shutting off gun.
lime deposits etc.)
Grease parts before
reinstalling.
Copyright 2015 Giant Industries, Inc.
Leaky pressure pipe. Seal pressure pipe.
Leaky cup. Change cup (9).
Dirty valve. Clean valve (removing
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