WELCOME TO OUR AIR ADMITTANCE VALVES PROJECT

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Summary: How air admittance valves work. How to install venilation into your toilet

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WELCOME TO OUR AIR ADMITTANCE VALVE PROJECT

Summary: How to install air admittance valves

<< Back to projects

Commonly called Durgo valves air admittance valves are designed to decrease the number of pipes that need to penetrate the roof and walls of a property. They reduce the number of parts required to ventilate a soil system and do not compromise the performance.

A valve, D, which is under a light spring pressure, is held closed during times of non activity in the drainage system. The positive air pressure of the room holds the valve down as well as the spring. When the toilet is flushed, the turbulence and gravitational pull of the water to the manhole below causes a negative pressure within the pipework. This opens the Diaphragm A and valve B allowing fresh air to be sucked in through the side vents C and down into the system. The equalisation of pressure prevents the foul air from escaping and the water seals in the traps (bath, toilet and basin) from escaping.

Valve Closed

Valve Open

Air admittance valves, when installed, must finish above the highest flood level of the space the valve is in...I.E. If the valve is in the same room as a wash hand basin, it must be higher than the overflow of that basin. This is so the pressure equalisation can occur without breaking the water in the traps.

For all the fittings you need to introduce another WC, click the images below

Air admittance valves are easily fitted and slip onto the top of the soil and vent pipe. The use of air admittance valves are governed by building regulations and cannot be used in all cases. Please check these regulations before attempting an installation and see our guide to the building regulations, approved document H, in the projects section

For all other soil and vent parts, click here

Top Tools

Click on a tool below for additional information.

Armeg Soil & Vent Pipe Installation Kit	DeWalt Drill Driver 12V	FloPlast Air Admittance Valve 32x40x50mm	FloPlast Push Fit Air Admittance Valve Grey
Grohe EAU Cistern Dual Flush	Push Fit Air Admittance Valve Black	Push-Button Flapper Toilet Cistern Valve	Single Socket Soil Pipe Grey 2x3m
Soil Strap Boss

Much more construction information is available in our bookstore. All the tools and fittings you need in the toolstore.

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