Zurn Wilkins 350XL Handleiding

Zurn Wilkins Niet gecategoriseerd 350XL

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Model 350XL LEAD-FREE*

Double Check Valve Assembly (1-1/4”- 2”)

*This product contains a weighted average lead content less than 0.25% for wetted surfaces.

*Meets the requirements of NSF/ANSI 61

INSTALLATION INSTRUCTIONS

CAUTION: Installation of Backow Preventers must be performed by qualied, licensed

personnel. The installer should be sure the proper device has been selected for the par-

ticular installation. Faulty installation could result in an improperly functioning device.

ZURN WILKINS Model 350XL Double Check Valve assemblies are for use on potable

water lines where a health hazard does not exist in the event of a backow situation.

Damage to the device could result wherever water hammer and/or water thermal expan-

sion could create excessive line pressure. Where this could occur, shock arresters, check

valves and/or pressure relief valves should be installed downstream of the device.

If installation is in a pit or vault, the Backow Preventer must never be submerged in

water because this could cause a cross-connection. Make sure that the pit or vault always

remains dry by providing ample drainage.

1. Before installing a Model 350XL Backow Preventer, ush the line thoroughly to

remove all debris, chips and other foreign matter. If required, a strainer should be

placed upstream of the Backow Preventer. CAUTION: Do not use a strainer in

seldom used emergency waterlines such as re lines.

2. -Provide adequate space around the installed unit so that the test cocks will be ac

cessible for testing and servicing.

3. Install valve at least 12 inches above surrounding ood level.

4. Always consult local codes for installation methods, approvals and guidance.

INDOOR INSTALLATION

Indoor installation is preferred in areas

that are subject to freezing conditions. All

the basic installation instructions apply to

such installations.

OUTDOOR INSTALLATION

The Model 350XL Backow Preventer may

be installed outdoors only if the device

is protected against freezing conditions.

Exposure to freezing conditions will result

in improper function or damage to the

device. The installation location must be

kept above 32°F. All the basic installation

instructions apply.

PLACING THE MODEL 350XL IN SERVICE

1. Start with both shut-off valves closed.

Slowly open the inlet shut-off valve

until the backow preventer is com-

pletely pressurized.

2. When the unit has been pressurized,

vent any trapped air by slightly open-

ing each of the four test cocks.

3. Slowly open the downstream shut-

off valve. The Model 350XL Double

Check Valve assembly is now in

service.

4. After the Model 350XL has been

properly installed, test the device (see

“TEST PROCEDURES”). If the device

fails the test, remove the rst and

second check valves and thoroughly

ush the device. Clean rubber and

seats of all debris and place unit back

in service.

VERTICAL INSTALLATION

Vertical installation is acceptable in ap-

plications where inlet and outlet piping are

owing vertically upwards. All the basic

installation instructions apply to such instal-

lations. Consult factory for approval status.

  Installation Testing Maintenance Instructions

DIRECTION OF FLOW

12" MIN.

30" MAX.

DIRECTION OF FLOW

OPTIONAL STRAINER

(MODEL SXL)

PROTECTIVE

ENCLOSURE

DIRECTION OF FLOW

ZURN WILKINS

1747 Commerce Way, Paso Robles, CA 93446 Phone: Fax:805-238-5766855-663-9876

www.zurn.com

! WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

! ADVERTENCIA: Cáncer y daño reproductivo - www.P65Warnings.ca.gov

! AVERTISSEMENT: Cancer et néfastes sur la reproduction - www.P65Warnings.ca.gov

MODEL 350XL DOUBLE CHECK VALVE ASSEMBLY

Equipment Required: Differential pressure gauge test kit.

TEST NO. 1 - TIGHTNESS OF #1 CHECK VALVE

REQUIREMENT:

The static 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 vertical 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 attach ttings.

2. Attach 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 attached to test

cock #3,open test cock #3 to ll 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 static pressure

drop across check valve #1 after 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 static 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 vertical tube must be installed on test cock #4

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

PROCEDURE:

1. Attach 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 attached to test

cock #4, open test cock #4 to ll 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 static pressure

drop across check valve #2 after 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.

Testing Procedures

ZURN WILKINS

1747 Commerce Way, Paso Robles, CA 93446 Phone: Fax:805-238-5766855-663-9876

www.zurn.com

ZURN WILKINS

1747 Commerce Way, Paso Robles, CA 93446 Phone: Fax:805-238-5766855-663-9876

O-RING

BOLT

SLEEVE

BOLT

O-RING

TEST COCKS

O-RING

HOUSING

Maintenance Instructions

CHECK ASSEMBLY

O-RING

SEAT, #2

BOLT

SEAL

RE INERTA

SEAL

WASHER

POPPET

SPRING

RE INER, #2TA

O-RING

SEAT, #1

BOLT

SEAL

RE INERTA

SEAL

WASHER

POPPET

SPRING

RE INER, #1TA

SPRING

All Model 350XL Double Check Valve Backow Preventers

must be inspected and maintained by licensed personnel at

least once a year or more frequently as specied by local

codes. Replacement of worn or damaged parts must only

be made with genuine “ZURN WILKINS” parts.

GENERAL MAINTENANCE

1. Clean all parts thoroughly with water after disassembly.

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

3. Test unit after reassembly for proper operation (refer to

“TESTING PROCEDURES”).

SERVICING CHECK VALVES

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. Unscrew the 4 bolts (1/4-20 UNC Hex Flange) holding the

housing in place. Lift housing up to remove.

4. Twist and remove sleeve from body. Using nger or blunt

object, push in outlet end of body, both checks should slide

out the body inlet. A short object like a socket can be placed

on a at surface. Place body over object so it pushes into

valve outlet and push down on body.

5. Twist spring retainers counter-clockwise to remove from

seats and access poppets.

6. Inspect the rubber seal ring for cuts or embedded debris. To

remove seal ring, remove screw and seal ring retainer. If the

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

the seal ring. This will be considered a temporary solution to

xing a fouled check and should be replaced with a new seal

ring as soon as possible.

7. Inspect seat surface for nicks or dings and replace if neces-

sary. Use ngernail to check for dings. Re-grease seat

o-rings.

8. Inspect seat o-ring sealing areas in body and wipe clean.

9. Reverse the above procedures to reinstall check valve

assembly. Drop #2 check assembly in body. Then drop #1

check assembly in and turn until #1 spring retainer lines up

with #2 seat. Then push both assemblies into body. Insert

sleeve against checks. (Place sleeve down against at

surface and push on body with rocking motion.)

10. Lightly grease face of o-rings on housing and reinstall into

body following the above procedures in revers order. Rock

body side to side to help o-rings slide in. If it does not drop in

completely, do not use screws to force it. An overly greased

o-ring might slide out of groove at top of ball valve. Use a

screw driver to push o-ring back in groove, then push body

down in.

Note: When installing housing, match slight taper on the outlet

of the housing with corresponding taper in body.

www.zurn.com

Product specificaties

Merk:	Zurn Wilkins
Categorie:	Niet gecategoriseerd
Model:	350XL

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