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Glossary
of Valve Definitions:
The following glossary
of terms is intended as an aid in your understanding of valve
products and their components.
Here you will find links to other sources of information.
Each link will open up a new browser window and either take
you to another web site, or will link to an Adobe Acrobat
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For a printable Glossary
of terms, click
Glossary of Terms.
Gate
| Globe | Check
| Y-Strainer | Ball
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Gate
Valve
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This
valve has a gate that moves perpendicular to the flow
of the service. In the up position it is open. In
the down position it is closed. The flow is straight
through, and does not lend itself for use as a metering
valve. The gate valve is used mainly as an on/off
valve.
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Globe
Valve
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The
globe valve is the most popular valve for metering or
regulating fluid flow. Seating in globe valves is parallel
to line of flow and the flow pattern is offset, not
a straight-line through flow. This design affords a
better closure than a gate valve. The change in direction
of fluid flow produces increased resistance and considerable
pressure drop. Because the flow is directed against
the disc in a symmetrical fashion, there is very little
wear on the valve parts and is one of the easiest valves
to repair.
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Check
Valves
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This
valve is used to stop back flow to the upstream side
of the valve. The design is quite simple. A hinged
door or a ball is placed inside the valve. With the
pressure coming upstream the door or ball is held
open; when pressure increases on the downstream side,
it forces the door or ball to close, stopping any
back flow. SAMFLOW
® flanged
check valves and 200# class check valves are swing
checks, the 800#
class check valves are piston type lift check valves.
The piston type valve works up and down
providing a strong, firm seal under high pressure
conditions.
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Y-
Strainer Valves
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This
valve is designed to remove foreign matter from pipe
lines and provide protection for pumps, meters, valves,
and other similar mechanical equipment.
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Ball
Valves
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A
valve with a spherical closure member. It is usually
a quick opening valve and usually has a very tight shutoff
characteristic. The actuation of the ball valve shaft
is by ¼ turn (90 degrees) from full open to full
closed. Ball valves are normally considered for on-off
applications with special designs for throttling or
modulating control services. (www.www.valves-source.com/VALVEINFOPAGE.HTM)
In
addition to on/off service, ball valves can be used
to modulate flow. In full port valves, the flow is straight
through the port, resulting in minimum pressure loss.
As the temperature increases, the pressure capability
decreases. PTFE loses strength in higher temperatures.
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