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Overview
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SURGEBUSTER Swing Check Valve Product Overview |
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Overview
Optional
Accessories
Valve
Features
Headloss
Chart
Installation
Dimensions and Construction
Dynamic
Testing of Check Valves |
| Pumping
applications with high head, surge tanks, or multiple
pumps, have long proved a challenge to system operators
trying to minimize line surges resulting from slamming
check valves.
Only one real cause exists for slamming check valves --
reverse flow. The impact of the reverse flow is direct
and proportional, the faster the reverse flow, the more
violent the slam. If reverse flow through the check valve
is allowed to develop, the reverse flow will slam the
disc into the seat and create a loud water hammer or surge.
Now system operators have the solution...the SURGEBUSTER®!
The newest member of the Swing-Flex® swing check valve family.
The SURGEBUSTER® is a swing check valve that fully
meets ANSI/AWWA C508. But here is where the similarities
to traditional swing check valves end.
The SURGEBUSTER® achieves rapid closure through a
short disc stroke of 35° and adjustable Disc Accelerator™.
The short disc stroke is less than half the typical 80°
to 90° stroke of a conventional swing check valve.
It is achieved by placing the valve seat on a 45°
angle while maintaining a full flow area equal to the
mating pipe (Figures 1 & 2.)
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Figure
1 |
Figure
2
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The
Disc Accelerator™ is a precision formed stainless
steel mechanism that closes the valve disc rapidly thus
avoiding slamming by flow reversal and yet allowing the
disc to be stabilized under flow conditions. The accelerator
is fully enclosed within the swing check valve and completely out of
the flow path (Figures 1 & 2).
Traditional swing check valves use outside levers with weights
or springs in an attempt to reduce slam. By doing so, they
pull the disc down into the flow and reduce the length of
the disc stroke so that it closes faster.
Unfortunately, while outside levers and weights help solve
one problem, they create two others. Increased headloss
and maintenance are inevitable with traditional swing check
valves. Pulling the disc down into the flow creates a blockage
in the line and causes tremendous headloss and turbulence.
With the disc oscillating in the flow, the shaft, bearings,
and shaft seal are all subjected to severe wear and reduced
service life.
In many applications, even this approach has proven ineffective
and led to the inclusion of an air cushion cylinder. The
air cushion is attached to the weight or spring powered
lever that is pulling the disc down. The traditional air
cushion on the other hand is working in reverse by slowing
the disc through its full stroke and allowing reverse flow
to build. The end result, especially on fast flow reversal
systems, is a slamming check valve and water hammer.
The SURGEBUSTER® swing check valve with its short 35-degree stroke and
Disc Accelerator™ provide fast closure thereby preventing
slam and the resultant surge without obstructing flow or
the need for maintenance.
Val-Matic is so confident in the SURGEBUSTER’S non-slam
performance that we guarantee* the SURGEBUSTER’ swing check valve will outperform
any air cushion swing check valve with weight and lever.
*Warranty details available upon request. |
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