Val-Matic Wastewater Combination Air Valve User Manual

Wastewater Combination Air Valve

Operation, Maintenance and

Installation Manual

INTRODUCTION.................................... 2

RECEIVING AND STORAGE ................ 2

DESCRIPTION OF OPERATION........... 2

INSTALLATION...................................... 3

VALVE CONSTRUCTION...................... 3

MAINTENANCE..................................... 4

TROUBLESHOOTING........................... 5

DISASSEMBLY...................................... 5

REASSEMBLY....................................... 6

PARTS AND SERVICE.......................... 6

WARRANTY........................................... 7

®

Manual No.
WCAV-OM1-1

VAL-MATIC® VALVE AND MANUFACTURING CORP.

905 RIVERSIDE DR. ELMHURST, IL. 60126
TEL. 630 / 941-7600 FAX. 630 / 941-8042

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VAL-MATIC'S WASTEWATER COMBINATION AIR VALVE

OPERATION, MAINTENANCE AND INSTALLATION

INTRODUCTION

This manual will provide you with the information to
properly install and maintain the valve to ensure a
long service life. The Wastewater Combination Air
Valve has been designed with stainless steel trim to
give years of trouble-free operation but regular
maintenance is recommended for valves subject to
fluids containing suspended solids or greases/oils.
The Wastewater Combination Air Valve is typically
mounted at the high points in a piping system to
automatically remove pockets of air as they
accumulate. The valve can also be used to slowly
release air in tanks and pump casings.

CAUTION: This valve is not intended for

The valve is a float-operated, resilient-seated valve
designed to handle waste fluids. The valve may be
equipped with backwash accessories. The Size,
Maximum Working Pressure and Model No. are
stamped on the nameplate for reference.

RECEIVING AND STORAGE

Inspect valves upon receipt for damage in shipment.
Handle all valves carefully without dropping. Valves
should remain boxed, clean and dry until installed to
prevent weather related damage. For long-term
storage greater than six months, the valve must
remain in the box and stored indoors. Do not
expose valve to sunlight or ozone for any extended
period.

DESCRIPTION OF OPERATION

The Wastewater Combination Air Valve is designed
to automatically remove air pockets at the high
points in a piping system. The valve, as shipped, is
a normally open valve and will rapidly vent air
through the top opening. As fluid enters the valve,
the float will rise, closing the orifice. As air
accumulates in the piping system and enters the
valve, the float drops allowing the small venting
orifice to open.

The valve can be furnished with optional external
valves and hose connections for backwashing.
These items are packaged separately.

flammable liquids service.

FIGURE 1. WASTEWATER COMBINATION AIR
VALVE

When air enters the valve, it is released through the
large-diameter seat and the outlet on the top of the
valve. When fluid enters the valve, the float lifts the
plug, which seals off the seat. The orifice button
also seals against the small orifice drilled through
the center of the plug. The float has a skirt to assist
in closure and reduce leakage. As air or gas
accumulates in the valve, the float will drop and pull
the button away from the plug. This will allow
pressurized air to be vented through the plug.
Additional ports are provided for flushing, testing and
draining purposes.

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INSTALLATION

The installation of the valve is important for its
proper operation. Valves should be installed at the
system high points in the vertical position with the
inlet down. For pipeline service, a vault with freeze
protection, adequate screened venting, and
drainage should be provided. During closure, some
fluid discharge will occur so vent lines should extend
to an open drain area in plant service. A shut-off
valve should be installed below the valve in the
event servicing is required.

CAUTION: Install valve with "INLET" port

down or leakage will occur.

VALVE CONSTRUCTION

The standard Wastewater Combination Air Valve
body and cover are cast iron. See the specific
Materials List submitted for the order if other than
standard cast iron construction. All internal
components are stainless steel with the exception of
the orifice button, which is resilient. The general
details of construction are illustrated in Figure 2.
The body (1) is threaded for connection to the
pipeline. The seat (4) is threaded into the cast cover
(2).

ITEM DESCRIPTION MATERIAL
1 Body Cast Iron
2 Cover Cast Iron
3 Baffle (1”-2”) Cast Iron
Baffle (3”-4”) Ductile Iron
4 Seat* Stainless Steel
5 Float* Stainless Steel
6 Gasket* Non-Asbestos
7 Cover Bolt Alloy Steel
8 Retaining Screw* Stainless Steel
10 Float Arm* Stainless Steel
11 Orifice Button* SS and Buna-N
12 Pivot Pin* Stainless Steel
13 Retaining Ring* Stainless Steel
14 Pipe Plug Steel
15 Cushion* Buna-N
16 Plug Stainless Steel
17 Float Retainer* Stainless Steel
18 Lock Nut* Stainless Steel
20 Guide Shaft* Stainless Steel
28 Pipe Plug Malleable Iron
33 Clevis* Stainless Steel
34 Lock Washer* Stainless Steel
35 Guide Shaft Retainer* Stainless Steel
36 Pipe Plug Steel

*RECOMMENDED REPAIR PART KIT

TABLE 1. LIST OF PARTS

FIGURE 2. 1”-4” WASTEWATER COMBINATION
AIR VALVE

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