- Straight flow body with large diameter automatic orifice – Higher than usual flow rates.
- Aerodynamic full-body kinetic shield – Prevents premature closing without disturbing air intake or discharge.
- Dynamic sealing – Prevents leakage under low pressure conditions (0.1 bar).
- Compact, simple and reliable structure whose parts are fully corrosion, chemical and fertilizer resistant – Lower maintenance and increased life span.
- Designed in compliance with EN-1074/4 standard.
- Factory approval and Quality Control – Performance and specification tested and measured with specialized test bench, including vacuum pressure conditions.
- Field proven designed for use in irrigation applications with water quality such as river water, channel water, dam water or treated effluent with high reliability.
- Surge Protection (anti-slam) – Smoother operation, preventing damage to the valve and the system (C10-SP).
- Inflow prevention – Prevents intake of atmospheric air in cases where this could lead to damaged pumps, required re-priming, or disruption of siphons (C10-IP).
- Service Ports fitted – (1/8”) or (1/4”) plug for pressure gauge connection, check point or test drain for air valve function.
- Threaded Side outlet (DN50/2”) for connection of Surge Protection (SP) or Inflow prevention (IP) devices
- Pressure rating: ISO PN16
- Operating pressure range: 0.1-16 bar
- Operating temperature: Water up to 60°C
Principles of Operation Pressurized Operation:
During the filling process of a pipeline, high air flow is forced out through the kinetic orifice of the air valve. Once water enters the valve’s chamber, the float buoyed upward causes the kinetic orifice to close. The unique aerodynamic structure of the valve body and float ensures that the float cannot be closed before water reaches the valve.
During pressurized operation of the pipeline, air accumulates in the upper part of the air valve chamber, causing the float to gravitate downwards. This in turn causes the automatic orifice to open, releasing the accumulated air. Once the air is discharged, the water level and float rise, causing the automatic orifice to close.
When a pipeline is drained, a negative differential pressure is created causing atmospheric air to push the float down. The kinetic orifice stays open and air enters the valve chamber, preventing vacuum formation in the pipe.
Surge Protection (anti-slam):
The anti-slam device is fitted to the air valve outlet. In the event of pressure surge, it partially closes the valve’s outlet. The approaching water column decelerates due to the resistance of the rising air pressure in the valve. This is typically used on pump stations and at specific pipeline locations to minimise pressure surges during pipe filling or power failure conditions at the pump station.
The inflow prevention is a Normally Closed check device fitted on the valve’s outlet and prevents flow of atmospheric air into the valve. Typically used to prime pump suction lines or on pipelines requiring only air discharge and no air re-entry such as siphons.