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Bolted
Bonnet
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Practical,
commonly used design adaptable to different types of
gasketing. Multiple bolting permits application of equalized
sealing pressure. Only the highest pressures and temperatures
tax its capacity to permanently hold tight.
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Screwed
in
Bonnet
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For
smaller valves where frequent dismantling is not required.
Ordinarily used on gate, globe, and angle valves for
moderate pressures.
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Union
Bonnet
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Easy
to dismantle and reassemble without danger of injury
to body-bonnet bearing surfaces. Union ring gives added
strength and rigidity to body against internal pressure
and distortion. Ideal for services requiring frequent
inspection and cleaning of internal valve parts. Use
restricted to smaller size valves.
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Cv
Rate
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Refers
to the Cv Coefficient for
valves. It is defined as the flow
of water at 60 ° F in gallons per
minute (GPM), at a pressure
drop of one pound per square
inch
across the valve.
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Torque
Rating |
Is
the amount of force required to open and close the valve.
The required torque depends on the design of the valve.
Stem size and pitch, friction from the tightness of
the stem packing, seating design, all play a role in
torque requirements. Other conditions that affect the
operating torque requirements are heavy pipe line media
or abrasive fluid, line pressure, temperature, fluid
volume and the lubicity of seating materials.
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Rising
Stem
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OS&Y
(Outside Screw & Yoke) Keeps the stem threads outside
the valve and is recommended where high temperatures,
corrosives, and solids in the line might damage the
stem threads inside the valve. When open, the stem extends
above the handwheel indicates the position of the gate.
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Integral
Seats
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Machined
into the body casting.
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Renewable
Seats
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Separate
seat rings that screw into the valve body.
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Trim
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Refers
to the stem, seat, and disc in gate and globe valves,
and to the seat, disc, and hinge pin in swing check
valves.
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Flexible
Wedge
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Is
a variation of the solid wedge. It is joined at the
center by a hub which enables the disc faces to compensate
for variable temperatures and pressures and allows valves
to operate at lower torque.
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Solid
Wedge
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One
piece wedge. The most widely used wedge. Primarily used
in sizes 2" and smaller. Gate valves with a solid wedge
can be installed with stems in any position. Recommended
particularly for steam service where a split wedge or
double disc would vibrate and chatter.
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Wire
Mesh
&
Perforated
Steel |
The
term “mesh” applies to
woven wire cloth and is not
to be confused with perforations,
which applies to perforated
sheet metal. While mesh
screens are satisfactory for
small sizes of screwed end
“Y” strainers they might
be considered unsuitable for
larger strainers unless furnished
as a liner for a perforated metal
screen or basket. Mesh screens
are primarily furnished for
very fine straining with openings
so fine they could not be
obtained in in perforated metal.
SAMFLOW ®
Y-Strainer valves
use a 12 Perf screen. The hole diameter is .045 . (3/64”)
There
are 225 holes per square inch.
Open area is 36%.
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here for more
info. (PDF File) |
