TPI January 2009

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January 2009 Tube Products International 33
f i t t ingsfeature on . . .
Check valves
The patented WaStop valve developed by Wapro AB, Sweden, is a simple,
reliable solution in non-return valves.
WaStop can be installed as protection against basement flooding in residential
and commercial buildings. As a check valve in sewage and storm water drains,
WaStop effectively stops backflow. The valve can even function as an odour
stopper in sewage systems.
WaStop is an elastomer check valve containing only two parts – a sleeve and a
pipe. The valve is completely free from obstruction between the inlet and outlet
and has no mechanical parts, seats or balls to cause problems.
It has very low damping qualities, opening with only a few centimetres of water
pressure. WaStop is self-cleaning, requiring minimal maintenance.
The valve is available in dimensions from DN75 to DN1200, and installation
is simple, even in existing pipes and chambers. An installation example can
be found in Hunstanton, UK. Hunstanton has a long tradition for having
unpredictable and severe tides.
Directly in the path of these tidal surges from the North Sea was a long sea
outfall that was fitted with a cast iron flap valve.
When this flap valve failed, the answer was to install a 700mm WaStop directly
into the end of the outfall.
The installation took less than two hours. With the WaStop installed within the
existing outfall, very little of its profile is exposed to lateral wave action, unlike
the flap valve.
Wapro AB is currently expanding its export market as interest for its products
grows. Products are currently sold in Scandinavia, UK, Italy, Austria, Germany,
Poland, USA, Canada and Switzerland.
Wapro AB – Sweden
•
the operation represented a step change
in the acceptance of this technology,
providing a practical and cost-effective
solution at large diameters to ease
the process of making repairs and
new connections to gas distribution
systems.
UPLUS offers a full service for flow-
stopping gas mains, including fitting
access saddles and providing and
deploying flow-stop bags.
UPLUS is also able to cut out a length of
isolated pipe, connect and commission
a replacement piece, and tee or cap it
as required.
Flow-stopping provides a viable
alternative to squeeze-off techniques
for large diameter mains, reducing the
size of the excavation needed, and
improving the streetworks management
environment.
Radius Systems Limited – UK
Fittings from
carbon, alloy and
stainless steel
Weifang Huoda Pipe Fitting Co, China,
is a manufacturer and supplier of pipe
fittings, including elbows, tees, reducers,
pipe caps and flanges.
The company’s products, made from
materials including carbon steel, alloy
steel and stainless steel, are designed
and manufactured to conform to the
standards of API, ANSI, JIS, BS and
DIN.
The company can also supply specific
products according to customers’
requirements.
Weifang Huoda has established
business relationships with worldwide
customers, especially from Europe
and the Middle East, and has good
knowledge of the Chinese markets.
Huoda Pipe Fitting Manufacture Co,
Ltd – China
The WaStop check valve from Wapro can be installed quickly and easily S S