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PROBLEM POSSIBLE CAUSES

Air inlet valve does not open as gauge drops to 0.0 psid. 1. Air inlet disc stuck to seat.

Air inlet valve does not open and differential on gauge will 1. Leaking No. 1 shut-off valve.

not drop.

Air inlet opens below 1.0 psid. 1. Dirty or damaged air inlet disc.

2. Scale buildup on disc or bonnet.

Check valve opens below 1.0 psid. 1. Dirty or damaged check disc or seat o-ring.

2. Damaged seat.

IS420XL (REV. 4/13)

Maintenance Instructions

Testing Procedures

1. Close inlet and outlet shut-off valves before disassembling

device.

2. Remove canopy screw and canopy.

3. Bleed off pressure by opening the No. 2 test cock.

4. Unscrew the bonnet from the body by turning counterclock-

wise. CAUTION: Apply force at the outside edge of bonnets.

DO NOT use wrench or screwdriver on top of bonnet or oat

guides, damage can result.

TEST NO. 2

Purpose: To test the check valve for tight-

ness in the direction of ow.

Requirement: The check valve shall be

drip-tight in the normal direction of ow

when the inlet pressure is at least 1.0 psi

and the outlet pressure is atmospheric.

STEPS:

1. Attach high side hose of the differential

pressure gauge to test cock #1. Open

test cock #1 and bleed all air from the

hose and the gauge by opening the

high side bleed needle valve. Close the

high side bleed needle valve.

2. Close inlet shut-off valve.

3. Open test cock #2. The air inlet valve

will open and the water in the body will

drain out through test cock #2. When

this ow of water stops, the differential

pressure indicated by the gauge after

it has settled will be the pressure drop

across the check valve. This value must

be 1.0 psi or greater. Record this value.

If water continues to ow out of test

cock #2, then the inlet shut-off valve is

leaking.

4. Close test cocks #1 and #2 and remove

equipment.

5. Replace air inlet canopy.

6. Open inlet shut-off valve, then outlet

shut-off valve.

5. Remove the oat assembly, spring retainer, spring and spider.

The seat and seat o-ring may now be removed.

6. Clean all parts with clean water only.

7. After completing inspection, replace necessary parts and re-

assemble. Repair kits are available from your supplier.

8. Retest according to "TESTING PROCEDURES".

Troubleshooting

TEST NO. 1

Purpose: To test the opening pressure dif-

ferential of the air inlet valve.

Requirement: The air inlet valve shall open

when the pressure in the body is more than

1.0 psi above atmospheric pressure. The

air inlet valve shall be fully open when the

water drains from the body.

STEPS:

1. Bleed water through both test cocks to

eliminate foreign material.

2. Install appropriate ttings for test kit

hoses.

3. Remove air inlet canopy.

4. Install the high side hose of the diffe-

rential pressure gauge to test cock

#2. Open test cock #2 and bleed air

from hose and gauge by opening the

high side bleed needle valve. Close

the high side bleed needle valve.

5. Close outlet shut-off valve then close

inlet shut-off valve.

6. Slowly open the high side bleed needle

valve being especially careful not to

drop the pressure differential too fast.

Record the pressure differential at

which the air inlet valve opens.

7. Close test cock #2 and remove equip-

ment.

8. Open inlet shut-off valve.

CANOPY

CANOPY SCREW

BONNET

O-RING

RELIEF

VALVE

ASSEMBLY

AIR INLET

DISC

SPRING

RETAINER

CHECK SPRING

POPPET

SEAL RING

SEAT

O-RING

OUTLET SHUT-

OFF VALVE

FLOAT

BODY

TEST COCK #2

TEST COCK #1

INLET SHUT-

OFF VALVE

TEST COCK #1

OUTLET SHUT-

OFF VALVE

3/4" SIZE

1" SIZE

ZURN WILKINS

1747 Commerce Way, Paso Robles, CA 93446 Phone:855-663-9876 Fax:805-238-5766

www.zurn.com

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