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Service Replacement Parts and Maintenance

Series 900

First Check Valve Quick Cleaning Operation:

A.  Insert maintenance tool (15) into the vent port until the mark 

on the handle is flush with vent port surface.

B. Close both inlet and outlet gate valves.

C.  Open three test cocks (2, 3, and 4) located between the 

gate valves. The test cock which is immediately upstream of 
the first check valve (2) must be left open when the access 
door is swung open to equalize pressure. When this test 
cock is opened, the relief valve will tend to open, but will be 
captivated in a partially open position by the maintenance 
tool.

D. Remove eight hexagonal bolts from the access door.

E.  Swing the door to an open position collecting water spillage 

in a suitable receptacle.

F.  Inspect 1st check valve seat and discs for damage or deteri-

oration, after wiping with a clean cloth.

G.  If damage or deterioration to either seat is evident, remove 

the eight socket head screws and remove seat and gasket 
from valve. See photo (A).

H.  Reverse above procedure for reassembly. Note: Lubricate 

seat gasket with O-ring grease.

Removal of First Check Valve Assembly:

I.  Insert assembly tool (13) into the hole in the end of the relief 

valve casting and screw threaded rod onto the end of the 
check valve assembly (1) hand tight. Lubricate rod for easier 
turning.

J.  Tighten the wing nut of the assembly tool only until the 

maintenance tool (15) can just be removed from the relief 
valve vent port. (Approximately a half turn.) See photos (C) 
and (D).

A

B

DISC 

MAINTENANCE 

TOOLS

T Bolt T

ool

Assembly T

ool

Maintenance T

ool

5

13

15

Required for 4" and 6" only.

3

4

7

5

15

14

13

12

1

2nd Check Valve

1st Check Valve

2

RP-L900.indd   2

9/24/08   8:15:37 AM

Содержание 900 Series

Страница 1: ...mportant Inquire with governing authorities for local installa tion requirements Note For Australia and New Zealand line strainers should be installed between the upstream shutoff valve and the inlet of the backflow preventer RP L900 Watts product specifications in U S customary units and metric are approximate and are provided for reference only For precise measurements please contact Watts Technic...

Страница 2: ...in a suitable receptacle F Inspect 1st check valve seat and discs for damage or deteri oration after wiping with a clean cloth G If damage or deterioration to either seat is evident remove the eight socket head screws and remove seat and gasket from valve See photo A H Reverse above procedure for reassembly Note Lubricate seat gasket with O ring grease Removal of First Check Valve Assembly I Inser...

Страница 3: ...lding Allow valve to close Caution Keep fingers clear of closing P If second check valve is damaged or deteriorated remove six bolts from the flange of the second check valve module and remove the module Q After disassembly and cleaning reassemble the check valve module in the position shown in photo B R Inspect access door O ring seal to be sure it is in its proper position and close the door Rea...

Страница 4: ...MPANY HEREBY SPECIFICALLY DISCLAIMS ALL OTHER WARRANTIES EXPRESS OR IMPLIED INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE The remedy described in the first paragraph of this warranty shall constitute the sole and exclusive remedy for breach of warranty and the Company shall not be responsible for any incidental special or consequential ...

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