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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 number and working pressure (psi) are shown on the metal tag
on each ARV. According to AWWAStd’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 initially 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 displaced, 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 proper 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. Ashut off valve
could be installed at the ARV inlet for servicing.
SERIES
INSTALLATION / OPERATION / MAINTENANCE
SIMPLE & COMPOUND LEVER AIR RELEASE VALVE
Fig. 2
Fig. 1
Open Position
Simple Lever
ARV
Open Position
Compound Lever
ARV
Orifice
Button
Outlet
Orifice
Float
Inlet
Orifice
Orifice
Button
Outlet
Float
Inlet
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CONSTRUCTION MATERIALS
Standard materials of construction are listed in Tables below for Simple and Compound Level ARVs.
All internal componets are stainless steel with the exception of the orifice button.
General details of construction are illustrated in Figure 2. The body (1) is threaded for connection to the pipline. The seat
(4) is threaded into the cast cover (2).
Item Description Material
1 Body Cast Iron
10 Float Arm*
Stainless Steel
2 Cover Cast Iron
11 Orifice Button*
Buna-N
®
3 Lever Frame* Stainless Steel
12 Pivot Pin*
Stainless Steel
4 Seat* Stainless Steel
13
Pin Retainer*
Stainless Steel
5 Float* Stainless Steel
17 Float Retainer*
Stainless Steel
6 Gasket* Non-Asbestos
21
Locator*
Stainless Steel
7 Cover Bolt Alloy Steel
34 Lock Washer*
Stainless Steel
Item Description Material
1 Body Cast Iron
13 Retaining Ring*
Stainless Steel
2 Cover Cast Iron
14
Pipe Plug
Iron
3 Lever Frame* Stainless Steel
17
Float Retainer*
Stainless Steel
4 Seat* Stainless Steel
18 Lock Nut*
Stainless Steel
5 Float* Stainless Steel
19
Link*
Stainless Steel
6 Gasket* Non-Asbestos
21
Locating Pin*
Stainless Steel
7 Cover Bolt Alloy Steel
22
Orifice Button Arm*
Stainless Steel
8 Retaining Screw* Stainless Steel
30 Washer*
Stainless Steel
10 Float Arm* Stainless Steel
33
Clevis*
Stainless Steel
11 Orifice Button* Buna-N
®
34
Lock Washer*
Stainless Steel
12 Pivot Pin* Stainless Steel
*Recommended Repair Part Kit
*Recommended Repair Part Kit
Figure 2. Simple Lever Air Release Valves
Figure 2. Compound Lever Air Release Valves
PARTS LIST
PARTS LIST
<
STANDARD WORKING PRESSURE 175 PSI
TEST PRESSURE 300 PSI
OUTLET
4 3/4"
INLET
<
PIPE PLUG
OPTIONAL
<
5 1/4"
<
STANDARD PRESSURE
(WORKING PRESSURE)
175 P .S.I.
TEST PRESSURE 500 P.S.I.
OUTLET
INLET
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MAINTENANCE
The simple and compound Air Release Valves (ARV)
require no regular lubrication or maintenance.
A Periodic inspection to verify operation can be performed.
A manual drain valve can be installed in place of the lower
drain plug (14 - Fig. 2) to perform this operation as shown in
Figure 3.
1. Partially open inlet shut off valve until water flow is
visible. This will indicate the ARV is working properly. If
only air flow observed is follow steps 2-6.
2. Close inlet shut-off valve.
3. Slowly open drain valve to allow fluid in ARV to drain. If
draining is difficult, the orifice may be clogged (valve
requires service).
4. Close drain valve.
5. Slowly crack open inlet shut-off valve to fill ARV with fluid.
Observe the seating action and verify that valve closes
without leakage.
6. If leakage occurs, remove ARV to inspect internals for
wear or damage from foreign objects.
PROBLEMS
Solutions, presented below, will assist you troubleshooting
the ARV assembly in an efficient manner.
• Leakage at Inlet Connection
: Tighten valve threaded
connection. If leaks persists, remove valve and seal
threads with pipe sealant.
• Leakage at Cover: Tighten bolts per Table 2, or replace
cover gasket.
• ARV Leaks when Closed: Flush ARV to remove debris.
Disassemble and inspect seat, orifice button, for damage
and float for water content.
• ARV not Venting Air: Check that system operating
pressure does not exceed Working Pressure on ARV
nameplate. Inspection per steps 2-6 and disassemble
valve if problems persists.
DISASSEMBLY
Work on the ARV Should be one by a Qualified Mechanic
The ARV can be disassembled without removing it from the
pipeline. Or for the ARV can be removed from the line. No
special tools are required to make repairs.
1. Close inlet shut-off valve. Open drain valve or slowly remove
drain plug. Remove the cover bolts (7) from top cover
2. Pry cover (2) loose and lift off AR V body .
3. Remove the 2 retainer rings (13) and pivot pins (12) that
pass through the lever frame (3). The float (5) and linkage will
be free from the cover. Disconnect float from lever (10).
4. To remove lever frame (3), remove two rounded-head
fasteners (8). Rotate seat (4) counter-clockwise to remove.
5. Remove locknut (18) and orifice button (1 1) from orifice
button arm (22).
6. Clean and inspect parts. Note: some floats contain sand
for required weight; if water is detected, replace float.
Replace worn parts as necessary and lubricate parts with
food grade grease.
WARNING: The valve must be depressurized
before taking the cover off.
FIG. 3 INSPECTION
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REASSEMBLY
Clean all parts and gaskets surfaces with a wire brush in the
direction of the serrations or machine marks. Replace worn
parts, gaskets and seals before reassembly. Refer to Figure 2.
1. Apply Loctite PST No. 565 thread sealant to seat (4) and
screw into cover with maximum torque of 20 ft-lbs;
DO NOT OVER-TORQUE.
2. Screw down lever frame (3) to cover, over locating pin (21)
in cover , with screws (8) and washers (30).
3. Install new orifice button (11) flush to arm (22). Assemble
lockwasher (34) and locknut (18) over orifice button but do
not tighten. (see 5)
4. Connect arms (10 & 22) and assemble to lever frame (3) with
four pivot pins (12) and retaining rings (13); rings should
snap over pins.
5. Adjust orifice button (1 1) so that orifice button arm (22)
slopes up about 1/16” when resting gently against seat (4) as
shown in Figure 4. Secure button by tightening lockwasher
(34) and nut (18).
6. Attach float (5) by installing last pivot pin (12) into lever frame
(3). Float should lift freely pressing the orifice button (1 1)
against the seat (4) when pushed upward. Verify that all
retainers rings (13) are properly secured.
7. Lay new cover gasket (6) on clean surface and apply a
gasket compound such as Garlock 101-S to both surfaces.
Assemble gasket (6) and cover (2) over bolt holes in body (1).
8. Lubricate bolts (7) and tighten to the torques in Table 2.
9. Install ARV back in service. Refer to installation instructions.
Slowly open inlet shut-off valve. Valve is now back in
operation mode.
For above parts description and recommended spare parts kit see page 2
P ARTS AND SERVICE
Parts and service are available from Cla-V al agent or distributor
or the factory.
Note the ARV Model No. and Working Pressure are on the ARV
nameplate.
SIZE
1/4”
5/16”
3/8”
7/16”
1/2”
7/8”
TORQUE (FT
-LBS)
6
11
19
30
45
202
N-Air Release Valve 34AR (R-11/01)
Figure 4. Compound Lever ARV mechanism
for Orifice Button Adjustment
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