American Backflow CLA-VAL RP-4 User manual

Model RP-4
2” - 10”

Product Overview
RP-4 (1991-2005) Utilized the 3084 Toggle Lever
Checks and CDHS-24 relief valve.
2” size was discontinued in 2003
Replacement hardware parts were discontinued in
2005. Only Repair kits with rubber parts are
available.

Check Cover Removal
The check covers are secured by bolts and sealed by an o-ring.
2” through 6” sizes remove all but two cover bolts, leaving two bolts 180
degrees apart. Press down on the cover while removing the last two
bolts to prevent the cover from being forcibly ejected by the spring.
8” and 10 sizes, it is suggested that all-thread rod and nuts (jack
screws) be used when removing or replacing the covers. The 8” size
uses two 5/8”-11 all-thread approximately 8” long. The 10” size uses
two ¾” -10 approximately 8” long. Remove two cover bolts on opposite
sides of the cover, and install all-thread rod. Install and tighten nuts
down to cover. Remove remaining cover bolts. Simultaneously, back
the jack screw nuts off until the spring tension is completely released.
Remove the cover.

Check Valve Removal
Remove the two pipe plugs on
each side of the valve body, to
expose the lever arm pin (item
13) and the hinge pin (item 11).
Using a brass rod (smaller in
diameter than the pins), gently
tap out the rear lever arm (item
13) pin first.
CAUTION: Support the lever
arm (item 10) while completely
removing the lever arm pin. Let
the lever arm rest gently in the
bottom of the check valve.

Check Valve Removal
Grasp the yoke (item 7) with
one hand, while removing the
front hinge pin (item 11). Lift
out the toggle- lever clapper
assembly, being careful that
the brass seat is not dented.
NOTE: On 8” & 10” sizes, a
lever arm spacer (item 26) is
installed between the two
lever arms to maintain proper
distance between them, and
prevent binding.