January 2011 Tube Products International
41
Fi t t ings
Inline check valve stops tidal influence
on network
Valve World Expo Americas 2011
The WaStop
®
inline check valve has
been a popular choice in the inline check
valve market for stormwater and flood
protection in Sweden since 2001 and its
manufacturer, WaStop International AB,
says that it is now gaining recognition
overseas for its worldwide patented
design.
In Porirua City, New Zealand, the city
council ordered seven additional WaStop
valves following its initial installation
that proved effective in stopping the
encroachment of tidal waters into its
stormwater pipe and occupying vital
network capacity, according toDesmond
Scrimgeour, the senior waters engineer
of the Porirua City Council’s strategic
water services.
Located 20km north of the capital city
of Wellington, the city has more than
70 stormwater outlets discharging into
the harbour. A number of these outlets
are very flat on their approach to the
harbour, which generally means they are
severely influenced by high tide.
The problem with the outlets is that if a
rainfall event coincides with a high tide,
The first staging of Valve World Expo
Americas will be held in the Woodlands
Waterways Marriott Hotel & Convention
Center near Houston, Texas, 21-22 June
2011. This conference with an exhibition
component will be a collaboration
between Messe Düsseldorf and KCI
Publishing, both already cooperating for
the Valve World Expo held in Düsseldorf,
Germany every two years.
Messe Düsseldorf, located in Germany,
will be in charge of the exhibition
component through its US subsidiary
Messe Düsseldorf North America. KCI
Publishing, based in the Netherlands,
will manage the conference part of
the event through its subsidiary in
Canada.
the ability of the stormwater network
to discharge is severely restricted.
This creates a build up of water levels
within the network and restricts flow
into the system from private properties.
This leads to localised flooding or
ponding, restricting flow from sumps, or
discharging at a point of least resistance
within the network – generally in
manholes that are often situated on
or across private property, resulting in
severe flood damage.
Generally the solution has been to build
a large redundancy into the pipe system
to cater for required storage during
these events until the tide recedes when
considering an upgrade for these low
lying areas that have tidal influence.
However, this solution is normally very
expensive, with large amounts of capital
invested for very minimal use.
During a storm event, the WaStop
operates when the flow begins to build
up behind it at the outlet. It takes very
little head to open the WaStop, allowing
normal discharge into the harbour. As
the flow recedes within the network
and the pressure and head reduce, the
At the conference and expo attendees
will get an extensive overview of
technical innovations concerning valves,
valve-related products and valve–related
piping products, seals and sealing
materials as well as engineering, LDAR
(leak detection and repair) software,
SIS and services. The latest technical
trends to be presented at Valve World
Expo Americas 2011 will be of particular
interest to visitors from sectors such as
shipbuilding, on/offshore oil and gas
industries, the chemical and power
industries, the marine and offshore
industries as well as machine and plant
engineering and the food industry.
In 2009 Messe Düsseldorf acquired
Valve World Expo, the global event
for valves and valve accessories, from
KCI Publishing. The company launched
the trade fair in 1998 and has been
WaStop adjusts and closes once again,
stopping infiltration or back flow.
Mr Scrimgeour explained that the city
saved capital expenditure in pipes, time
and construction by installing WaStop
check valves in five different critical
areas, varying in diameter sizes from
225 to 1,050mm (8
7
/
8
" to 39
3
/
8
").
Porirua City ranked as a finalist in the
United Nations-supported International
Awards for Liveable Communities
because of its work in, amongst others,
environmentally sustainable projects.
Mats Persson, chief executive officer
of Wapro AB, the parent company of
WaStop International AB, invented the
WaStop check valve in the year 2000
after he realised the shortcomings of
the traditional duck-bill designed check
valve. He designed WaStop to have the
lowest head loss and the lowest opening
pressure in the check valve market,
withstanding 8m (26ft) back pressure.
WaStop International AB
– Sweden
responsible for organising and running
the event in the Dutch city of Maastricht
every two years since then.
ValveWorld Expo’s positive development
over the past few years is reflected not
only in the steady increase in exhibitor
and visitor numbers but also in the
amount of exhibit space booked. The
2008 event, held in Maastricht, attracted
454 exhibitors from 35 countries, and
9,500 trade visitors from Europe,
Asia, North and Latin America. For
the 2010 staging of Valve World Expo
in Düsseldorf, 516 exhibitors from 35
countries reserved 145,880 ft
2
of exhibit
space.
Messe Düsseldorf North America
–
USA
