Air Valve Triple Functions TYPE FBA Full Bore Version with anti-slam anti-water hammer device

• Single chamber body in ductile iron PN40, fitted with ribs for uniform and precise guidance of the moving assembly.
• Blue epoxy coating RAL 5005.
• Drainage valve, for chamber control and pressure relief during maintenance.
• Mobile block composed of a cylindrical float and an upper disk in solid polypropylene, joined together by the stainless steel air exhaust system. The solid cylindrical floats obtained by CNC machining; avoid deformations and ensure great sliding precision inside the body processed ribs and a perfectly vertical thrust.
• Nozzle and seal holder, part of the exhaust system, entirely made of stainless steel AISI 316.
• Maintenance can be performed from the top without removing the air valve from the pipe
• Anti-water hammer system, never in contact with water, achieved by the combination of a stainless steel spring and shaft and a disc with adjustable nozzles to control the air flow.
• Ductile iron cover and stainless steel screen as a standard execution to prevent insect entrance, with other air outlet options available (for submerged applications, air inlet only, air outlet only).

1. The breather version allows only for high-flow air intake and air release. This model is recommended for upward slope changes, long ascending sections and wherever degassing is not required.
2. The version for submerged applications allows for operation even in the event of flooding of the chamber. It enables channel jets caused by fast closure of the air valve.
3. Spring and nozzles are responsible for the correct operation of the AS function; it can be modified on request depending on hydraulic conditions and the results of water hammer analyses.

Working conditions

• Fluid: treated water. Max. temp.: 60°C.
• Maximum pressure: 40 bar.
• Min. pressure: 0.2 bar, lower on request.

Nozzle

Nozzle diameter according to the size of the air valve and the pressure.

Standards

• In compliance with EN-1074/4 and AWWA C-512.
• Flange drilling according to EN 1092/2 or ANSI 150.

Other drillings and coatings on demand.

The list of materials and components is subject to change without notice in accordance with technical developments.