The Wedge Plug Valve
The double block-and-bleed feature of the
wedge plug valve provides a solid foundation for product safety
under severe conditions. The wedge plug
valve is often referred
to as an “isolation
valve” because its design allows the
medium to be secluded, which is a critical requirement in many applications.
Wedge plug valves also offer superior
protection from erosion damage, from
solids build-up on sealing surfaces and in
cavities, and from residual freeze-up,
which can prevent operation and cause
leakage from wear. The wedge plug valve
is double-seated, which provides two isolation seals in contrast to the single seat
afforded by a metal-seated ball valve.
SMART VALVE ACTUATORS
As with most issues in the valve industry,
there is more to valve safety than the
valve itself. For power-operated valves, a
smart digital valve actuator can perform
diagnostics and maintain an internal
database of valve characteristics as they
change over time. This can alert operators to such problems as increased friction and, in the case of control valves,
changes in calibration.
In addition, a smart valve actuator on
an emergency shutdown valve can be
used to perform full stroke testing during scheduled plant shut-downs and partial stroke tests at regular intervals
while the plant is running; in fact, it can
help to elevate the safety integrity level
(SIL) of a valve used in a Safety Instrumented System (SIS).
No business that deals with chemical
processes can afford to take chances when
it comes to employee and environmental
safety—the consequences of leaks and
fugitive emissions can be hazardous and
potentially lethal. For this reason, the best
way to ensure safety is to select and
install the right equipment components as
well as the appropriate valves. VM
WILLIAM C. HAYES is vice president of marketing
(Global) for Crane ChemPharma Flow Solutions.
Your Pipeline to
Caplugs offers a full line of flange covers and pipe caps in a wide variety
of sizes, styles and materials. These inexpensive covers protect the face
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Caplugs parts can be used anywhere valves, piping, pumps and other
processing components with connections need to be protected. For unique
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