None RK1-720A Installationsanleitung PDF herunterladen (Seite 2)

POSSIBLE CAUSES

1. Air inlet disc stuck to seat.

2. “Old Style” pressure vacuum breaker (non-loaded air

inlet valve).

1. Leaking No. 1 shut-off valve.

2. Parallel installation with leaky No. 2 shut-off valve.

1. Dirty or damaged air inlet disc.

2. Scale buildup on seat.

1. Dirty or damaged air inlet disc.

2. Damaged seat.

IS720A (REV. 4/13)

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

2. Remove canopy screws counterclockwise and remove canopy.

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

4. Unscrew the bonnet from the body by turning counterclockwise.

5. Remove the disc & poppet assembly, check spring and spider assembly from body.

6. Clean all parts with clean water only.

7. After completing inspection, replace necessary parts and reassemble. Repair kits are available from your supplier.

8. Retest according to "TEST PROCEDURES".

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 no less 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 valve canopy.

4. Install the high side hose of the differ-

ential pressure gauge to test cock #2.

Open test cock #2 and bleed air from

hose and gauge.

5. Close #2 shut-off valve then close #1

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 #1 shut-off valve.

TEST NO. 2

Purpose: To test the check valve for tightness

in the direction of ow.

Requirement: The check valve shall be drip-

tight in the normal direction of ow when the

inlet pressure is 1.0 psi and the outlet pres-

sure is atmospheric.

STEPS:

1. Attach high side hose of differential

gauge to test cock #1. Open test cock

#1 and bleed all air from the hose and

the gauge by opening high side bleed

needle valve. Close high side bleed

needle valve.

2. Close #1 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 dif-

ferential 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 #1

shut-off valve is leaking.

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

equipment.

5. Replace air inlet valve canopy.

6. Open #1 shut-off valve, then #2 shut-

off valve.

CANOPY

PLASTIC

WASHER

DISC &

POPPET ASSY

SPIDER

ASSY

CANOPY

SCREW

BONNET

O-RING

SPRING

TEST COCK#2

BODY

BALL VALVE

TEST COCK#1

BALL VALVE

PROBLEM

Air inlet valve does not open as gauge drops to 0.0 psid.

Air inlet valve does not open and differential on gauge will

not drop.

Air inlet opens below 1.0 psid.

Check valve opens below 1.0 psid.

Troubleshooting

Testing Procedures

Maintenance

ZURN WILKINS

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

www.zurn.com

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