VACUVENT VA Series, Owner'S Manual

Page: 10 / 18

Independent Valve Marketing (Pty) Ltd
Engineering Page 10 of 18
VSS0203WD00
QUALITY CONTROL
All Vacuvent air valves conform to a stringent set of criteria before leaving the factory.
All valves are tested for full functionality and corrosion protection quality before being released by
the in-house quality manager.
Corrosion protection is of the highest quality and the mild steel components are fusion bonded
epoxy coated. Threaded components interacting with the fusion bonded epoxy coated parts are wet
assembled using a two pack epoxy approved for use in potable water.
Quality control documents and material data sheets can be made available on request with
purchase.
The Vacuvent series VA air valve has very little that can corrode and is prepared for active duty in
water delivery pipelines.
GENERAL DESCRIPTION
The Vacuvent - VA anti-shock series of air valves are intended to reduce the risks associated with
pressure variance in pipelines. Surge and water hammer will always be present in fluid transporting
pipelines; the intent of the Vacuvent air valve is to effectively manage the affects thereof in liquid
transporting pipelines.
When water drains from the pipeline, the VA series air valve opens to allow atmospheric air to force
its way into the pipeline, preventing a negative pressure forming inside the pipeline. This allows for
designers to reduce wall thicknesses in their pipes as negative pressure will not have such a
substantial effect on the line.
During filling or introduction of air into a pipeline the Vacuvent VA series anti shock air valve will
throttle the outgoing air via the small orifice and anti-shock orifice. Pressure is regulated via a
pneumatic relay between the small orifice and the much larger anti-shock orifice. This system will
ensure that air is drained from the pipeline.
Where necessary an optional - full stainless steel - body construction can be specified.
Before being packaged all Vacuvent air valves have to pass functional tests such that it is ensured
that they will function fully upon delivery.