Ames Fire & Waterworks 4000SS Stainless Steel Reduced Pressure Zone Assemblies - Manual (Page 2)

2
WARNING !
Depressurize valve before servicing.
Removing Cam-Checks
1. Shut down water system and lock out system if possible. Slowly
open all ball valves to relieve air and water pressure. Loosen
bolts on groove coupler and remove groove coupler and cover
plate from valve body.
2. #1 Check
Using a 9 /
16
" socket wrench or nut driver, remove the four nuts
from the #1 check studs (See Fig. 1). Using two hands, place
them at 12 o’clock and 6 o’clock, wiggle the check assembly
free. Remove through access port with back of clapper first with
spring end down. Pull check assembly out of main body. To in-
spect 1st check gear or to free 1st check of debris, see page 4.
#2 Check
After loosening bolts with a 9 /
16
" socket, remove bolts com-
pletely. Using the centerline access bar, spin the cam assembly
from the 9 o’clock position to the 12 o’clock position, then
(without letting go of the access bar) push the cam assembly
slightly downstream so that the clapper is now parallel to the
valve body. Now bring the cam assembly through the check
retaining wall. Leave the cam assembly clapper parallel to the
valve body. Pull the cam assembly through the access port.
3. Using a 3 /
8
" nut driver or a piece of small diameter pipe, place
on the cam arm torsion spring and move away from and
around the torsion spring retaining bracket so as to relieve the
torsion spring tension. This will allow the cam arm to move
freely, enabling you to inspect the clapper face and cam seat.
Thoroughly clean the seat area and clapper sealing surfaces,
cam arms, and O-rings for damage, nicks, and debris. If dam-
aged, install a new check assembly and/or O-ring.
4. Before reinstallation of check assembly, thoroughly clean
O-ring groove and lubricate with F.D.A. approved lubricant.
Outdoor Installation
NOTICE
Assembly body should not be painted.
Please Read Prior to Installation:
1. Before installing any Ames assembly, Flush the Line thoroughly
to remove all debris, chips and other foreign objects. Failure to
do so may make the assembly inoperable.
2. The Ames 4000SS Reduced Pressure Backflow Preventers are
approved by ASSE (American Society of Sanitation Engineers) to
be installed in horizontal positions. Local water authorities must
approve all installation configurations.
3. Allow sufficient clearance around the installed assembly to
conduct testing, servicing, and inspection. Allow a minimum of 12"
from the flood level to the bottom of the assembly.
4. The 4000SS is not recommended for pit installations. Where
necessary, an Air Gap drain may be connected to the relief
valve to minimize flooding of the surrounding area. Flooding
may cause a cross-connection. Be sure to contact local code
authorities for proper installations.
5. If installing on fire protection system, be sure to purge air from
fire system. Fill system slowly with all inspectors test valves
open.
Installation Guidelines Maintenance Instructions
Indoor Installation