Page 304 - index

Technical

Glossary of Terms

Compression Set The deformation that remains in rubber or PTFE after it has been subjected to and released from stress
such as a clamp. The longer the stress is maintained the more defnitive the deformation.

Durometer An instrument for measuring the hardness of rubber by resistance to penetration

Durometer Hardness A numerical value which indicates the resistance to indentation of the blunt indentor of the
durometer.

EPDM Ethylene propylene diene monome, a synthetic rubber

Elastomer Any of various elastic substances resembling rubber.

Electropolishing A controlled electrochemical process utilizing acid electrolyte, DC current, anode and cathode to smooth
the surface by removal of metal.

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 Coefficient ( v ) C the fow rate in U.S. gallons of water (at 60°F) that will pass through the valve in one minute with
v
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 Synthetic rubber and fuoropolymer elastomer 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 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
Z 302 processes. 800.789.1718 Dixon Sanitary 2014