AMES Maxim M200 Series 설치, 서비스, 수리 키트, 유지보수 - 페이지 3

{카테고리_이름} AMES Maxim M200 Series에 대한 설치, 서비스, 수리 키트, 유지보수을 온라인으로 검색하거나 PDF를 다운로드하세요. AMES Maxim M200 Series 4 페이지. Double check valve/detector assemblies, sizes 2 1/2"-10" 65-250 mm

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Maintenance Instructions 6" – 10" (150 – 250mm)

Material/Tool Requirements:

• #3 Phillips screwdriver or

to span diameter of check, see Figures A and B.

•

– 13 x 5" fully threaded hex bolt (Service bolt).

•

" open end or socket wrench.

Instructions:

Prior to servicing any Ames valve, it is manda-

tory to shut down the water system by closing

both the inlet and outlet shutoff valves. After

shutoff valves are closed, open test cock #2,

#3 & #4 to relieve pressure within

the backflow assembly.

1. After #3 test cock has been opened to

relieve pressure, remove #3 test cock from

housing.

When repairing a 6," 8" or 10" (150, 200, 250mm) assembly,

remove both Victaulic couplers from body. Slide the down-

stream Victaulic coupler gasket to the downstream side of the

housing. The upstream Victaulic coupler gasket stays in place.

Testing — Double Check Valve Assemblies

Test Check Valve No. 1

Step 1: Ensure shutoff #1 is open, shutoff #2 is closed.

Step 2: Connect high side hose to test cock #3, low side to test

cock #2 and open both test cock #2 and test cock #3.

Step 3: Open valve C, then open A to bleed air from the high

side. Close valve A, then open B to bleed low side.

Close valve B.

Step 4: Connect vent hose loosely to test cock# 1. Open valve

A to vent air from vent hose, Tighten vent hose at test

cock #1, open test cock #1.

Step 5: Close shutoff #1. Slowly loosen hose at test cock #2

until differential gauge rises to 2 pre-tighten hose. If the

differential reading does not decrease, record check

valves as "tight".

Test Check Valve No. 2

Step 1: Move the high side hose to test cock #4, low side to test

cock #3 and open both test cock #3 and test cock #4.

Remove vent hose from test cock #1, open shutoff #1.

Step 2: Open valve C, then open valve A to bleed air from the

high side. Close valve A, then open valve B to bleed low

side. Close valve B.

Step 3: Connect vent hose loosely to test cock #1. Open valve

A to vent air from the vent hose, Tighten vent hose at

test cock #1, open test cock #1.

Step 4: Close shutoff #1, and then slowly loosen hose at test

cock #3 until differential gauge rises to 2psi and retight-

en hose. If the differential reading does not decrease,

record check as tight. Remove all hoses and restore

valve to original working condition.

Note: The assembly will fail both the first and second check valve

tests above, if shutoff #2 leaks excessively. To test for a leaky #2

shutoff, use the following procedure.

" diameter rod, length sufficient

Figure A

Service Hole

Figure B

2. Remove check/s for maintenance.

3. Locate the service hole and thread in the service bolt by hand

until it contacts the linkage. (Figure A)

4. Continue to thread in service bolt with the wrench until the

service hole in the linkage is aligned with the service notches

on the spring arbors. (Figure A)

5. Insert the Phillips screwdriver through the arbors and service hole

of the linkage making sure that the tip of the screwdriver extends

past the ends of the arbors by a minimum of

6. Back out the service bolt until load is transferred to the screw-

driver. Continue to back out the service bolt until sufficient clear-

ance is achieved to remove the complete spring mechanism.

7. To disconnect linkage, remove retaining clip and pin (store in

a safe location for reinstallation).

8. To remove spring mechanism, grasp the screwdriver at the center

and pull complete assembly straight out and store in a safe place.

9. Reinstall in reverse.

WARNING – While the spring mechanism is removed for check

servicing; never pull the screwdriver out or off the support notches

on the arbors. Doing so may cause bodily injuries.

Test for Leaky No. 2 shutoff

Step 1: Connect the high side to test cock #1, low side to test

cock #4. Open test cock #1 and test cock #4. Close

shutoffs #1 and #2.

Step 2: Close valve C. Open valve A, then open valve B 1.2 turn,

loosen hose at test cock #4 to remove air. Retighten hose.

Step 3: If the differential gauge rises above 0, there is excessive

leakage at shutoff #2 and it must be replaced to test

the assembly.

Ball Type Test Valves

High Hose

(Yellow)

Test Cock

No. 1

No. 2

" (6mm). (Figure B)

Needle

Valve

Vent Hose

(Blue)

Low Hose

(White or Red)

Test Cock

No.3

No.4