Cla-Val 33A - Manual

High Performance Combination
Air Release & Vacuum Valve
MODEL
INSTALLATION / OPERATION / MAINTENANCE
DESCRIPTION OF OPERATION
Combination Air Valves are fully automatic and designed to continuously
remove pockets of air from high points in a piping system. They also vent and
admit large volumes of air during filing or draining of the pipeline or tank.
These are a normally open air valves that function in three ways:
1. During System start-up, the large open orifice exhausts large volumes of
air until fluid enters the valve. Then the float rises to shut both the large ori-
fice seat and the small orifice seat. Pressure within the valve will force the
float tightly against both the seat orifices.
2. As air accumulates at the high points of the piping system, (where the
valve is installed) air displacing the fluid, the float lowers with the fluid and
breaks contact with the small orifice seat. Accumulated air in the valve, is
then vented through the small orifice. As air is vented, the floats raise again
and closes the small orifice. This sequence repeats automatically as air
accumulates in the air valve.
INTRODUCTION
Cla-Val Combination Air Valves have been designed with stainless
steel trim to give years of trouble-free service. Combination Air
Valves are typically installed at high points of a water piping system.
They perform both functions of air release valve and air/vacuum
valve in one body.
Combination Air Valves automatically vent pockets of air from high
points while the system is pressurized. The valve will also vent and
admit large volumes of air while or draining the system or during
emergency power failure conditions. Both air release and
air/vacuum functions are essential to maintain pipeline efficiency and
protection from adverse pressure conditions.
RECEIVING AND STORAGE
Inspect valves for damage upon receipt. Valves should remain boxed
and stored in doors until installed to prevent weather related damage
OUTLET
INLET
1
6
10
5
4
11
2
3
SMALL
ORIFICE LARGE
ORIFICE
33A
OUTLET
INLET
1
5
11
2
3
LARGE
ORIFICE
SMALL
ORIFICE
4
1” 33A
2” 33A
Part No. Qty. Description Part No. Qty. Description
1 1 1” Cover (33A) 7 8 Bolt Hex Nut (33A)
2 1 1” Body (33A) 8 2 Screw Drive
3* 1 1” Float Ball Assembly 9 1 Nameplate
4* 1 1” Seal Rign 10 1 O-Ring
5* 1 O-Ring (33A) 11 1 1/4” NPT Drain Plug
6* 1 1” Seat (33A) *Recommended Spare Parts Kit
Part No. Qty. Description Part No. Qty. Description
1 1 2” Cover (33A) 7 8 Bolt Hex Nut (33A)
2 1 2” Body (33A) 8 2 Screw Drive
3* 1 2” Float Ball Assembly 9 1 Nameplate
4* 1 2” Seal Rign 10 1 O-Ring
5* 1 O-Ring (33A) 11 1 1/4” NPT Drain Plug
6* 1 2” Seat (33A) *Recommended Spare Parts Kit