Cla-Val 34AR Series - Manual

34AR
INTRODUCTION
Cla-Val Air Release Valves (ARVs) are built with stainless
steel trim to insure years of maintenance free service on
water systems. ARVs are float operated and have a
resilient orifice button for water tight shut off. Model num-
ber and working pressure (psi) are shown on the metal tag
on each ARV. According to AWWA Std’s C512-92
Note: These ARVs are not recommended for raw sewage
use or fluids containing a major percentage of suspended
solids. For this service use Series 34WW ARVs.
RECEIVING AND STORAGE
Upon receipt inspect shipment for damage, ARVs should
remain boxed until they are ready to be installed.
DESCRIPTION OF OPERATION
ARVs operate automatically to release pockets of air from
high points of water system (See fig. 1 & 2). ARVs are ini-
tially normally open and will vent air thru the orifice as the
water system is filled with fluid. As the fluid level rises in the
ARV so does the float to shut off the orifice. Subsequently
as air in the system collects in the ARV, the fluid is dis-
placed, allowing the float to drop, opening the orifice and
the collected air pocket is vented. The cycle is continually
repeated automatically, as air collects in the ARV.
INSTALLATION
ARV must be installed vertically in each high point for prop-
er operational performance. Pipeline installations may
require a valve vault or freeze protection. When ARVs shut
some fluid may spill, therefore piping the outlet to a drain is
recommended particularly in a pump room. A shut off valve
could be installed at the ARV inlet for servicing.
Orifice
Button
Float
Orifice
Outlet
Inlet
Outlet
Orifice
Button
Float
Orifice
Inlet
SERIES
INSTALLATION / OPERATION / MAINTENANCE
SIMPLE & COMPOUND LEVER AIR RELEASE VALVE
Fig. 2
Fig. 1
Open Position
Simple Lever
ARV
Open Position
Compound Lever
ARV