Watts 774 - Manual (Page 6)

6
774/774DCDA Repair Kits
EDP NO KIT NO. SIzE
in. mm
First or Second Check Kit
0888827 RK 774/774DCDA CK 4 8, 10, 12 200, 250, 300 774/774DCDA
Kits include: Complete Check with Check O-ring.
Cover Kit
0888828 RK 774/774DCDA C 8, 10, 12 200, 250, 300 774/774DCDA
Kits include: Cover, Grooved Coupler & Gasket.
Watts assemblies require minimum maintenance. All assemblies must be retested once maintenance has been performed.
(Before servicing be certain shut off valves are closed)
Check Studs Check Studs
#1 Cam-Check Figure 2 #2 Cam-Check Figure 3 Figure 4
Watts Series 774/744DCDA 8"- 12"
Servicing and Second Checks
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 couple
and cover plate from valve body
2. #1 Check (Fig.2) Using a 9 ⁄
16
" socket wrench or nut driver, re-
move 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 back of clapper first with spring end
down. Pull check assembly out of main body.
#2 Check (Fig.3) After loosening bolts with a 9 ⁄
16
" socket,
remove bolts completely, 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. (See Figure 4) 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.
4. Before reinstallation of Checks thoroughly clean O-ring groove
and lubricate O-ring with F.D.A. approved lubricant.