ZURN 350 Bedienungsanleitung

INST2018_Model350_65-250 Rev. 11/18 ZURN.COM.AU

ZURN WILKINS BACKFLOW

Double Check Valve Assembly

INSTALLATION & MAINTENANCE

MODEL 350 65-250mm

INSTALLATION INSTRUCTIONS

CAUTION: Installaon of Backﬂow Preventers must be performed

by qualiﬁed, licensed personnel. The installer should be sure

the proper device has been selected for the parcular installa-

on. Faulty installaon could result in an improperly funcon-

ing device.

-ZURN WILKINS Model 350 Double Check Valve assemblies are

for use on potable water lines where a health hazard does

exist in the event of a backﬂow situaon.

-Damage to the device could result wherever water hammer

and/or water thermal expansion could create excessive line

pressure. Where this could occur, shock arrestors, check valves

and/or pressure relief valves should be installed downstream

of the device.

-If installaon is in a pit or vault, the Backﬂow Preventer must

never be submerged in water because this could cause a

cross-connecon. Make sure that the pit or vault always

remains dry by providing ample drainage.

1. Before installing a Model 350 Backﬂow Preventer, ﬂush the

line thoroughly to remove all debris, chips and other foreign

maer. If required, a strainer should be placed upstream of the

Backﬂow Preventer. CAUTION: Do not use a strainer in seldom

used emergency waterlines such as ﬁre lines.

2. Provide adequate space around the installed unit so that the

test cocks will be accessible for tesng and servicing.

3. Install valve at least 300mm above surrounding ﬂood level.

4. Always consult local codes for installaon methods, approvals

and guidance.

5. Resilient seated shutoﬀ valves are required to be installed on

both the inlet and outlet of the device to make ﬁeld tesng

possible.

WARRANTY: ZURN WILKINS Valves are guaranteed against defects of material or workmanship when used for the services recommended. Please

refer to the LWG Zurn/ Zurn Wilkins Product Warranty Statement for details.

PERFORMANCE

1200kPa

60 Celsius

2400kPa

MODEL 350 FEATURES

Max. Working Water Pressure

Max. Working Temperature

Hydrostatic Test Pressure

End Connections Flanged

WATERMARK

AS/NZS 2845.1

LIC. 1379

TYPE

TESTED

AS/NZS 4020

LIC. 20111

STANDARDS COMPLIANCE

-Australian Watermark (AS/NZS 2845.1) Approved Lic. 1379

-Type Tested AS/NZS 4020 Lic. 20111

PLACING THE DEVICE IN SERVICE

1. Start with both shut-oﬀ valves closed. Slowly open the inlet

shut-oﬀ valve unl the backﬂow preventer is completely

pressurized.

2. When the unit has been pressurized, vent any trapped air by

slightly opening each of the four test cocks.

3. Slowly open the downstream shut-oﬀ valve. The Model 350

Double Check Valve assembly is now in service.

4. Aer the Model 350 has been properly installed, test the device

(see “TEST PROCEDURES”). If the device fails the test, remove

the ﬁrst and second check valves and thoroughly ﬂush the

device. Clean rubber and seats of all debris and place unit back

in service.

65, 80 & 150mm 200 & 250mm

OUTDOOR INSTALLATION: The Model 350 Backﬂow Preventer may be installed outdoors only if the device is protected against

freezing condions. Exposure to freezing condions will result in improper funcon or damage to the device. The installaon locaon

must be kept above 0°C. All the basic installaon instrucons apply.

DIRON OF F

�

WILKINS MODEL 350

DIRON OF F

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WILKINS MODEL 350

INST2018_Model350_65-250 Rev. 11/18 ZURN.COM.AU

ZURN WILKINS BACKFLOW

Double Check Valve Assembly

INSTALLATION & MAINTENANCE

MODEL 350 65-250mm

TESTING PROCEDURES

TEST NO. 1 - TIGHTNESS OF #1 CHECK VALVE

REQUIREMENT:

The stac pressure drop across check valve #1 shall be at least

1.0 psid. If test cock #3 is not at the highest point of the check

valve body, then a vercal tube must be installed on test cock

#3 so that it rises to the top of the check valve body.

PROCEDURE:

1. Slowly open all 4 test cocks to remove any foreign material and

aach ﬁngs.

2. Aach hose from the high side of the test kit to the #2 test

cock.

3. Open test cock #2 and bleed all air from the hose and gauge

by opening the high side bleed needle valve. Close high side

bleed needle valve. If a tube is aached to test cock #3, open

test cock #3 to ﬁll the tube. Close test cock #3. Close #2

shut-oﬀ valve then close the #1 shut-oﬀ valve.

4. Hold gauge at same level as test cock #3 or water level in tube.

Slowly open test cock #3. Record the stac pressure drop

across check valve #1 aer gauge reading stabilizes and water

stops running out of test cock #3.

5. Close all test cocks, open shut-oﬀ valve #1 and remove test

equipment.

TEST NO. 2 - TIGHTNESS OF #2 CHECK VALVE

REQUIREMENT:

The stac pressure drop across check valve #2 shall be at least

1.0 psid. If test cock #4 is not at the highest point of the check

valve body, then a vercal tube must be installed on test cock

#4 so that it rises to the top of the check valve body.

PROCEDURE:

1. Aach hose from the high side of the test kit to the #3 test

cock.

2. Open test cock #3 and bleed all air from the hose and gauge by

opening the high side bleed needle valve. Close high side bleed

needle valve. If a tube is aached to test cock #4, open test

cock #4 to ﬁll the tube. Close test cock #4. Close #1 shut-oﬀ

valve.

3. Hold gauge at same level as test cock #4 or water level in tube.

Slowly open test cock #4. Record the stac pressure drop

across check valve #2 aer gauge reading stabilizes and water

stops running out of test cock #4.

4. Close all test cocks, slowly open shut-oﬀ valve #1 & #2 and

remove test equipment.

EQUIPMENT REQUIRED: Diﬀerenal pressure gauge test kit.

VENT HOSE

LOW SIDE HOSE

HIGH SIDE HOSE

LOW SIDE BLEED

NEEDLE VALVE

#1 TEST COCK

#4 TEST COCK

#3 TEST COCK

#2 TEST COCK

#2 SHUT-OFF

VALVE

#1 SHUT-OFF

VALVE HIGH SIDE BLEED

NEEDLE VALVE

INST2018_Model350_65-250 Rev. 11/18 ZURN.COM.AU

ZURN WILKINS BACKFLOW

Double Check Valve Assembly

INSTALLATION & MAINTENANCE

MODEL 350 65-250mm

SERVICING CHECK VALVES

Aach a ratchet wrench, 17mm deep socket, and a 100mm

long extension are recommended for removing check

assemblies.

1. Close inlet and outlet shut-oﬀ valves.

2. Open No. 2, No. 3 and No. 4 test cocks to release pressure

from valve.

3. Loosen & remove the grooved coupling around the access

cover. Remove cover.

4. To service only the #1 check assembly, remove the 6 bolts,

washers and o-rings from the back of the #1 check assembly.

Separate the retainer and the seal ring from the check

assembly and proceed to step #8.

5. To service both checks or the #2 check, the #1 check assembly

must ﬁrst be removed. Remove the 4 nuts and washers

retaining the #1 check assembly. Remove the #1 check

assembly from the body.

6. To remove the #2 check assembly, remove the 7 nuts,

washers and the #2 check retaining ring. Grasp the check

assembly by the stem and remove from valve.

7. Remove all 6 bolts, washers and o-rings from the check

assembly (See “Check Assembly” illustraon). Separate

retainer from check assembly to expose seal ring for inspec-

on.

8. Inspect the rubber seal ring for cuts or embedded debris. If

the reverse side of the seal ring is unused, it is possible to

invert the seal ring. This would be considered a temporary

soluon to ﬁxing a fouled check and should be replaced with

a new seal ring as soon as possible.

9. Inspect valve cavity and seang areas. Remove any debris.

10. Reverse the above procedures to reinstall check assemblies.

Lubricate seat o-rings to hold them in place while reinstalling

seat. Place washers on studs and ghten retaining nuts

evenly.

11. Reinstall access cover and grooved coupling.

NOTE:

If any poron of the seat assembly is damaged or missing or if

the seat sealing rib is damaged in any way, do not aempt to

ﬁeld repair it. Contact your local ZURN WILKINS representa-

ve for assistance.

CHECK ASSEMBLY

SEAT ASSEMBLY

SEAL RING

O-RING

(BOLT)

SEAL RETAINER

WASHER

BOLT

CHECK HANDLE

O-RING (SEAT)

65 & 80mm

100 & 150mm

SEAT ASSEMBLY

SEAL RING

O-RING

SEAL RETAINER

WASHER

NUT

O-RING (SEAT)

SEAT ASSEMBLY

SEAL RING

O-RING

(BOLT)

RETAINER

WASHER

BOLT

200 & 250mm

All Model 350 Double Check Valve Backﬂow Preventers must be

inspected and maintained by licensed personnel at least once a

year or more frequently as speciﬁed by local codes. Replace-

ment of worn or damaged parts must only be made with

genuine “ZURN WILKINS” parts.

GENERAL MAINTENANCE

1. Clean all parts thoroughly with water aer disassembly.

2. Carefully inspect rubber seal rings and o-rings for damage.

3. Test unit aer reassembly for proper operaon (refer to

“TESTING PROCEDURES”).

INST2018_Model350_65-250 Rev. 11/18 ZURN.COM.AU

ZURN WILKINS BACKFLOW

Double Check Valve Assembly

INSTALLATION & MAINTENANCE

MODEL 350 65-250mm

#2 PLATE RETAINER (4” & 6”)

(PLASTIC RETAINER MODELS 21/2” & 3”)

#2 CHECK ASSEMBLY

FIGURE 1 FIGURE 2 FIGURE 3

#1 CHECK ASSEMBLY

#1 RETAINER

GASKET

SERVICING CHECK VALVES cont ’d

PROBLEM POSSIBLE CAUSES CORRECTIVE ACTION

LEAKING CHECK VALVES 1. Debis on seat or seal ring 1. Clean seat area

2. Damaged seat area 2. Replace check assembly

3. Damaged seat o-ring 3. Replace seat o-ring

4. Damaged bolt o-ring(s) on check retainer 4. Replace o-ring(s)

LOW OR NO FLOW 1. Device installed backwards 1. Verify ﬂow direcon arrow

2. Gate valves not fully open 2. Turn handles counter-clockwise

3. Low supply pressure 3. Aach pressure gauge to testcock

#1 & verify pressure

TROUBLESHOOTING

INST2018_Model350_65-250 Rev. 11/18 ZURN.COM.AU

ZURN WILKINS BACKFLOW

Double Check Valve Assembly

INSTALLATION & MAINTENANCE

MODEL 350 65-250mm

PERFORMANCE CHARACTERISTICS

MODEL 350 65, 80 & 100mm

104

12.6 25.2 37.9 50.5

FLOW RATES (l/s)

PRESSURE LOSS kPa

65mm 80mm

100mm

MODEL 350 150 & 200mm

104

25.2 50.5 75.7 100.9 126.2 151.4

FLOW RATES (l/s)

150mm

200mm

104

63.0 126.0 189.0 252.0

MODEL 350 200 & 250mm

PRESSURE LOSS (kpa)

200mm

250mm

PRESSURE LOSS kPa

FLOW RATES (l/s)

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