Page 184 - DixonSanitaryCatalog20082010

182 Dixon Sanitary 2010 800.789.1718
Technical Information
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Technical
EPDM Ethylene propylene diene monome, a synthetic rubber
Elastomer Any of various elastic substances resembling rubber.
Encapsulation The enclosing of material by an encapsulant for protective purposes. In a ball valve the ball is encased
in PTFE, preventing the material fowing through the valve from getting behind the ball causing
contamination problems.
Flow Coeffcient (Cv) Cv is defned as the fow rate in U.S. gallons of water (at 60°F) that will pass through the valve in one
minute with a differential pressure across the valve of 1 PSI.
Ferrule A bushing used to secure a tube joint. A special bushing designed for welding to the end of tubing.
Two ferrules and a gasket make a leak-proof connection when used with the complimentary clamps.
Fitting A small part of an apparatus (may be detachable).
Fluorocarbon Elastomer known as Viton® a registered trademark of DuPont, generally known as FKM.
Friction loss The part of the total loss that occurs as the fuid fows through straight pipe.
Hex Union Nut An internally acme-threaded six-sided connector used to assemble bevel seat fttings.
ISO5211 International standard for actuator and valve interface
Internal Expansion (IX) A plug (or bullet) is pulled through a stem or a set of blades (fngers) increase the stem ID to the plug
OD or a predetermined setting when using expansion blades (fngers). This forces the stem serrations
into the hose tube and the hose cover into the serrations of the ferrule.
Laminar Flow The smooth fow of a viscous liquid through a tube or pipe. In that case, the velocity of fow varies
from zero at the walls to a maximum along the centerline of the vessel.
Maximum-Shut-Off Pressure (Delta-P) The pressure of the media fowing into the valve against which the valve will have
to close.
Media The material fowing through the valve.
Modulating Service Proportional positioning of a valve between the open and closed position. Used for fow control
processes.
MTR Material Test Report
Neoprene Synthetic rubber, chemically and structurally similar to natural rubber
Nominal Size A dimensional value assigned for the purpose of convenient designation.
On-Off Service When the valve is being used to start or stop fow by being cycled to the full open or full closed
position.
Operating Pressure The pressure at which system functions. Also known as working pressure.
Polish To make smooth and shiny by rubbing. Fittings may be machine polished to 180 grit fnish. Polish is
ID, OD, or both per customer request.
Polyproylene A lightweight synthetic plastic
Pressure The force per unit area applied on a surface in a direction perpendicular to that surface.
PSI Pounds per square inch
PSIG Pounds per square inch gauge
PTFE Tetrafuoroethylene, DuPont’s Tefon®, is a high performance thermo plastic polymer that has excellent
dielectric strength, chemical and temperature resistance.
Santoprene A thermoplastic elastomer, a rubber-like material that complies to FDA requirements