Ashirvad Air Admittance Valves Description The purpose of an air admittance valve is to provide a method of allowing air to enter the plumbing drainage system to prevent siphonage of plumbing fixture traps. It is a one-way valve designed to allow air to enter the drainage system when negative pressures develop in the piping system. The device closes by gravity and seals the vent terminal at zero differential pressure (no flow conditions) and under positive internal pressures. Ashirvad along with Sanit (Germany), introduces two variants of Ventilair® Air Admittance Valves into the Indian markets. Ashirvad Cpvc pipes and fittings in Indore | Ashirvad pipes in Indore | Ashirvad Pipes Distributor in MP | Ashirvad Pipes Distributor in indore | Ashirvad pipes dealer in Indore | Ashirvad pipes Supplier in MP | Ashirvad Pipes Supplier in Indore | Air Admittance Valves in Indore | Air Admittance Valves in Mp | Air Admittance valves Supplier | Best pvc pipes and fittings | Best Swr pipes and fittings | Best Cpvc pipes and fittings | Best Upvc Pipes and fittings |