CLA-VAL RP-2 User manual

Model RP-2
¾” - 1 ½”

Product Overview
Model RP-2 (1978 - 2003) Utilized poppet
style checks and a CDHS-20 relief valve.
Replacement hardware parts were
discontinued in 2005. Only repair kits with
rubber parts are available.

Check Cover Removal
The check covers are
secured by 4 cap
screws and sealed by
an o-ring.
The covers are spring
loaded.

Check Valve Removal
Poppet style checks.
Once the cover is
removed the poppet
and spring are free.
Green Spring
indicates first check.
Orange spring
indicates second
check.

Check Seat Service
Check seats are o-ring sealed
and threaded into the body.
Replacement seats are no
longer in production.
Very fine nicks on the seating
edge can be restored by slowly
working 400 wet or dry
sandpaper on the beveled
edge of the seat.

Check Disc Replacement
Hold the disc retainer
in one hand and with
an allen wrench,
unscrew the stem
from the disc retainer.
Replace the disc as
necessary.

Check Valve Reassembly Notes
Inspect and clean the
guide bore on the
cover.
The stem must move
freely in the guide
bore.
Reassemble in
reverse order.

Relief Valve Cover Removal
The CDHS-20 RV has two
covers. The bellofram cover (item
3) and the intermediate body or
“diaphragm cover” (item 2).
The bellofram cover (item 3) is
located on top of the RV
assembly.
The bellofram cover is secured
by screws and sealed by the
bellofram.
There is no spring load on this
cover.

Relief Valve Cover Removal
The intermediate body (item 2) is
secured by cap screws and
sealed by the diaphragm.
There is a slight spring load on
this cover, so exert pressure
downward on the cover as the
cap screws are removed.
The RV stem assembly is
mounted through the
intermediate body.
The RV spring is free once cover
is removed.

Disassemble RV Stem
•The stem is secured by the
upper and lower stem nuts
(item 16).
•Remove the upper stem nut
first.
•The bellofram, piston and
retainer can now be removed
from the upper stem.
•Remove the stem along with
the diaphragm and disc from
the body.

Disassemble RV Stem
Remove lower stem nut
(item 16).
Remove the diaphragm
(item13), the lower stem
o-ring (item 15) and
washer (item 7) from
stem.

RV Disc Replacement
The RV disc (9), disc
retainer (8), and guide
(10) are removed as one
assembly.
Remove guide and pry
disc from retainer.

RV Seat Service
The RV seat is o-ring sealed
and threaded into the main
RV body.
Replacement seats are no
longer in production.
Very fine nicks on the seating
edge can be restored by
slowly working 400 wet or dry
sandpaper on the beveled
edge of the seat.

Diaphragm Reassembly
Reassemble the diaphragm
(item 13), lower stem o-ring
(item 15) and washer (item 7)
on the lower stem (4).
Reassemble the RV disc, disc
retainer, and guide as one
assembly on the lower stem.
The serrated area of the disc
retainer (8) is positioned
against the diaphragm.
Insert the stem (4) with
diaphragm and disc retainer
intact, into the intermediate
body.

Upper Stem Reassembly
Reassemble the bellofram (12),
piston (5), retainer (6) and stem o-
ring (15) on the upper stem and
replace stem nut.
Position the retainer (6) with its
outer lip facing up.
Position the bellofram with the
glossy side against the retainer(6).
The fabric side against the piston(5)
Position the piston (5) with the
recess around the stem hole facing
down toward the o-ring (15).

Intermediate Body Reassembly
Position the RV spring over the
seat in the main body.
Insert cap screws through
intermediate body and
diaphragm.
Make sure the sensing passage
is aligned properly.
Press the intermediate body
down on the main body and start
cap screws.
Be sure to evenly cross tighten
cap screws.

Bellofram Reassembly
Carefully push bellofram(12) “brim”
straight down over itself so that the
“brim” is flat and smooth against the
intermediate body.
Make sure the bellofram is not
twisted or wrinkled.
Install cover (3) so that weep hole
faces out away from backflow.
Do not rotate cover after placing
over the “brim”, this can twist and
tear the bellofram.