Glossary and index of fluid power principles and components

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

M

MANDREL
1) A form, generally of elongated round section used for size and to support hose during fabrications and/or vulcanization. It may be rigid or flexible. 2) A tapered expanding device, fixed in diameter which is pulled through a shank of a fitting thus expanding the diameter to exert force on the hose between the shank and ferrule.

MANIFOLD
A fabricated system of passages to which various components are attached to form a working assembly or subassembly.

MANUAL CONTROL
A control actuated by the operator.

MANUAL OVERRIDE
A means of manually actuating an automatically-controlled device.

MANUFACTURER’S IDENTIFICATION
A code symbol used on or in some hose to indicate the manufacturer.

MASS FLOW RATE
The mass of fluid per unit of time passing through a given cross-section of a flow passage in a given direction.

MEAN DIAMETER
The mid-point between the inside diameter and the outside diameter of a corrugated/convoluted hose.

MECHANICAL CONTROL
A control actuated by linkages, gears, screws, cams or other mechanical elements.

MENDER
A fitting or device used to join two sections of hose.

METER
39.37 inches. The measure of distances in the metric system.

METER-IN
To regulate the amount of fluid flow into an actuator or system.

METER-OUT
To regulate the flow of the discharge fluid out of an actuator or system.

MICRON
1/1000th of a millimeter or 0.00003937 inches. The measure used to determine the particle size of contaminants in a fluid system.

MICRON RATING
The size, in microns, of the particles a filter will remove.

MICROPROCESSOR
A digital computer based on a single miniature integrated circuit that offers programmability and computational ability for use in electrohydraulic control applications.

MINIMUM FREE LENGTH
Calculated as four times the hose OD plus half the hose minimum bend radius as a best practice for hydraulic hose assemblies.

MODEM
Modulator / Demodulator. A device used to provide digital data communications between two separate microprocessing units. The modulator converts digital information into tomes that are transmitted over telephone lines and the demodulator changes the received tones back to digital data.

MOTOR
A device which converts hydraulic fluid power into mechanical force and motion. It usually provides rotary mechanical motion.

MULTIMETER
A device (VOM or DMM) used to measure electrical quantities.

MUFFLER
A mechanical device which provides a complex path for exhaust of air from a pressurized chamber, thus reducing the noise level of the exhausting air.