Glossary of Terms

Accessory Connection - Allows for the attachment of gauges (to read discharge pressure). Also can be used for draining the product out of the discharge casting.

Connecting Rod - Shaft that connects the drive end of the pump with the rotor. Also available in auger type to help feed products into the stator cavities.

Discharge Flange - A standard connection matched to the individual pump’s discharge pressures. Flanges are sized to ensure self-cleaning velocities essential when pumping sludges and slurries.

Drain Plugs - Allows for the suction housing to be drained of any leftover product.

EPDM - Short for Ethylene-Propylene Terpolymer. This is a type of elastomer.

Flexi Rod - An alternative type of connecting rod which eliminates the need for joints by deflecting to compensates for eccentricity of rotor motion.

Gear Joint - Sealed ring and ball gear type universal joint.

Grease Zerk - Nipple that allows grease to be inserted for lubrication purposes.

Hygiene Joints - Universal joints for sanitary applications.

L-Geometry - Elongated geometry rotors and stators.

Lantern Ring - Channeled and ported ring installed between packing rings in stuffing box which creates a passage for shaft lubrication.

Mechanical Seals - A mechanical assembly used to seal a shaft where it passes through a mechanical opening.

Micron (µm) - A unit of length equal to one thousandth (103) of a millimeter or one millionth (106) of a meter.

Nitrile - Short for Acrylonitrile Butadiene rubber. Commonly known as Buna N.

Non-Pulsating Metered Flow - A smooth, exact uninterrupted delivery of pumping medium.

O Rings - An elastomer ring which seals through an interference fit.

Packed Stuffing Box - Type of shaft seal utilizing teflon-kevlar, teflon, graphite or other braided "packing."

Poise - A centimeter-gram-second unit of dynamic viscosity equal to one dyne-second per square centimeter.

Pressure Shock Resistance - Able to withstand 10 bar.

Process Controller - Programmable devices used for electronic or electrical control of a system, ie, PLC.

Progressing Cavity - Pump principle by which a rotor (usually metallic) turns within a stator (usually elastomeric). As the rotor turns, cavities are opened and closed progressing the product to the pump discharge.

Progressing Cavity Pump - A "Moineau" principle positive displacement helical screw type pump capable of pumping viscous liquids to high pressure.

Rene Moineau - Inventor of the progressing cavity pump and the Moineau principle.

Rotor - The helical shaped rod that rotates within the stator.

S-Geometry - Geometry of the rotor and stator. Also known as "Standard Geometry" or the "1:2 Geometry."

Self Priming - Ability of the pump to automatically prime itself.

Shaft Seal - Barrier seal that prevents leakage of pumped media from suction housing around rotating shaft. Standard seal is packing. Other seals include mechanical seals.

Shear Rate - The rate and extent that a pumped media’s viscosity is reduced and cohesive properties are broken down as pumped media passes through the rotor/stator assembly.

SM Sealing - A NETZSCH exclusive design of universal joint seals for the gear and pin type universal joints.

Solid Drive Shaft - The cylindrical shaft that transmits power from the pump driver to the pump drive train. The cylindrical shaft is solid metal insuring smooth pump operation and providing exceptional strength.

Stator - Flexible or rigid material having varied geometries which forms a seal with the rotor and enables a sealed progressing cavity to transmit a pumped media.

Suction Housing Flange - The flange extending from the suction body of the pump acting as the entry way for media into the pump.

Thru Bolt Construction - The design construction used to secure the stator to the pump.

Transfer Pumps - Used to move slurry from tank to tank.

Universal Joints - The connection between the connecting rod, rotor and drive shaft of a pump. Types of Universal Joints include: Pin, Gear and "Z" Joints.

Viscosity - The quality or state of being viscous. The property of resistance to flow in a fluid or semifluid.

Z Joint - The name given to one type of the NETZSCH universal joint. This type of joint is found mostly on the larger pump sizes and is configured similar to a car universal joint.