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• Erroneouswatermetering
• Damage to the spinning components of the water meter.
• Vibrations and water hammer in the pipeline and water meter

Applications
The presence of air in a pressurized piping system may cause both metering inaccuracies and damage to the water meter. The METAIR M-040 is used to improve metering accuracy and meter protection.

Operations
When municipal water supply is discontinuous or erratic, water drains from higher sections of the distribution system, accumulating in lower section. Air replaces the receding water, accumulating in these higher sections. Upon renewal of the water supply, water refills the pipeline, displacing the air, forcing air through the water meter, spinning the impeller and gears very rapidly. Air flowing through the meter causes damage to its internal mechanism and inflates its readings. The M-040 ARI combination air valve prevents air from passing through the water meter by releasing accumulated air from the pipeline to the atmosphere. As water arrives, it buoys the float, sealing the outlet to the atmosphere, while the check valve opens, allowing water passage to the water meter.

Main Features
Combination Air Valve with three functions of operation: Discharges air at high flow raters while the pipeline is filled with water. Admits air into the pipeline at high flow rates during system drainage and water column separation. Continuously releases entrapped air that accumulates in the pipeline when the system is under pressure.

• Working range: 0.2 - 10 BAR / 3-150psi
• Connections: Threaded ½ BSPT or NPT
• Temp: Up to 60°C, 140°F
• Materials: THe air valve is made of corrosive resistant materials
• Integral shut-off valve: An innovative built-in shut off valve in the valve cap enables the isolation of the air valve orifice with no interference with water flow in the pipe.
• Drainage System: Optional drainage outlet or screen outlet.
• Integral air trapping N.R. valve.

Advantages and Benefits

• Light and small.
• Dynamic Design allows high velocity air discharge, preventing premature closing.
• Dramatically reduces obstruction by debris, by it's self-cleaning mechanism.
• Enables relatively large automatic air release orifice.
• No maintenance.
• Spring loaded check valve opens at 0.25 BAR water pressure in the direction of the water meter. The check valve assures effective air trapping and prevents water drainage from the water meter.
• Kinetic air discharge and intake and Automatic air release.
• Brass base for durability and continuous electrical conductivity.
• User-friendly integral orifice shutoff valve.

Valve Selection

• BSP or NPT ½" thread.
• Option: One-Way Air discharge only

Installation and Maintenance Instructions

• The M-040 Metair will be installed in-line, upstream (before) the water meter, between the meter's isolating valve and the meter, and as close as possible to the water meter.
• The Metair must be installed with the check valve base horizontal and the air valve body vertically upright.
• The M-040 Metair is virtually maintenance free and is a long-life, one-use disposable air valve.
• In case of leakage through the air valve orifice, the Metair can be shut-off by means of rotating covershut-off mechanism.

Project (tender) Specifications
The combination air valve, specially designed for water meter protection application, will discharge air from the pipeline at the pipe filling, and will continue releasing accumulated air system operation under pressure.

The air valve will, also, provide vacuum protection by admitting air into the pipeline at pipe drainage, at pipe burst and at water column separation while preventing back flow through the water.

• The air valve will be an in-line air valve with an integral, built-in, mechanical air trapping system.
• The air valve will include an integral, built-in check valve, affecting only a minimal head loss.
• The air valve will include an integral, built-in, orifice shut-off valve to prevent water flow through the air valve orifice at system failure.
• The air valve will include an integral orifice drainage outlet for easy removal of excess fluids.
• The air valve's horizontal pipe connection will be ½" BSPT or NPT thread.
• The air valve's effective and efficient operating pressure range will be from 0.2 BAR to 10 BAR.
• The air valve will be pre-tested at the factory, at 0.2 BAR and 15 BAR line pressure. The air valve will not leak even at line pressure as low at 0.5 BAR.
• The in-line combination air valve will be of the type ARI Model M-040 or equal.