396
Dixon Sanitary 2014
800.789.1718
Technical
Modulating Service
Proportional positioning of a valve between the open and closed position. Used for flow control
processes.
MTR
Material Test Report
NAMUR
International Standard of Interface for actuator accessories connections.
NEMA
National Electrical Manufacturers Association
NEMA Rating
National electrical code ratings for electrical component enclosures.
NEMA 4
Weather-proof enclosure suitable for indoor/outdoor applications to protect from windblown dust, rain or hose-
directed water.
NEMA 4x
Offers the same protection as NEMA 4 with the addition of corrosion resistance.
NEMA 6
Enclosure that may be submerged up to six feet for 30 minutes.
NEMA 7
Enclosure for hazardous locations must be capable of withstanding an internal explosion of gases so as not to ignite
an external gas-air mixture.
NPSH(a)
Net positive suction head available is the amount of fluid pressure you have at the suction side of the pump due to
atmospheric pressure, pressurized tank or other means.
NPSH(r)
Net positive suction head required is the amount of fluid pressure required at the suction to prevent cavitation. This
requirement is found on pump curves produced by each pump manufacturer.
Net Positive Suction Head
Amount of energy in the liquid at the pump datum. It must be defined to have a meaning,
as either available or required NPSH.
Neoprene
Synthetic rubber, chemically and structurally similar to natural rubber.
Nick
a surface void anomaly caused by material removal or compression from the surface, whose bottom surface is usually
irregular.
Nominal Size
A dimensional value assigned for the purpose of convenient designation.
ODP
Open Drip Proof motor enclosure
On-Off Service
When the valve is being used to start or stop flow by being cycled to the full open or full closed position
Operating Pressure
The pressure at which system functions. Also known as working pressure.
Orbital Welding
automatic or machine welding of tubes or pipe in-place with the electrode
rotating (or orbiting) around the work. Orbital welding can be done with the addition of filler
material or as a fusion process without the addition of filler.
PSI
Pounds per square inch
Glossary of Terms
Y