Watts AMES 4000SS Serie Manual De Instalación & Mantenimiento página 4

Inspecting and Cleaning the First Check
WARNING
!
Depressurize valve before servicing.
Use extreme caution when servicing the first check.
Use the following procedure and accompanying illustration to inspect
the seat and clean the seat and clapper washer.
1. After removing the first check from the backflow valve body, place
it on a flat surface with the coil spring facing up.
2. To gain access to the seat and clapper rubber ring, compress the
spring (item 3) that surrounds the clapper shaft (item 1) by placing
the ⁄ " threaded rod through the two holes of the spring retaining
3
8
plate (item 2).
3. After placing the ⁄ " all-thread rod through the spring retaining plate,
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8
screw the threaded rod into the holes (item 4) at the base of spider
(item 5, next to shaft). Be sure to use two nuts on the threaded
rod to tighten them into the holes. The depth of the threaded holes
should be approximately 1/2". This operation requires the use of two
pieces of threaded rod.
4. Compress the spring by loosening the top
without unscrewing the threaded rod from the spider. Place a box
end wrench or crescent wrench on the
retaining plate and tighten. Tighten the threaded rod and nut
evenly: put a few turns on one threaded rod nut and a few turns on
the other, repeat alternating between the two until finish.
5. During compression, the clapper slowly moves up, away from the
seat. To examine the seat, continue the spring compression until
the clapper has moved approximately 1" from the seat. This allows
debris to be removed and the seat to be examined.
6. To unload the spring compression, loosen the all-thread and then
double nut the all-thread and unscrew the rod from the spider and
shaft base.
⁄ " nut and back it off
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3 ⁄ " nut closest to the spring
8
4
Tools required:
• Two pieces of 3/8" all thread rod (approximately 14" long)
• Four 3/8" hex nuts
• Adjustable crescent wrench
• Pipe wrench or channel lock pliers
All Thread Rod
3 ⁄ - 16
8
var.
9
ITEM
1
2
3
4 3 ⁄
8
5
6
7
8
9
1
2
3
4
5
7
8
DESCRIPTION
Shaft
Spring retaining plate
Spring
" threaded hole (maintenance)
Spider
Spider retaining bolt
Seat ring
Clapper to shaft bolt
Seat ring retainer
6