MANUFACTURED FLANGE TO FLANGE DIMENSION
The manufactured width of the joint measured from the joint flange face to flange face.
MATTE FINISH
A dull surface, as opposed to a smooth plate finish.
MEDIA
The fluid which is being sealed.
METAL C-RING
C-section metal seal with low load characteristics. Plating and coating are added for improved performance.
METAL O-RING
Hollow tubular seal with circular cross-section. Various shapes and sizes can be fabricated and different plating and coating can be added for better performance.
METAL SEAL
Seal composed entirely of metal components, which, when compressed between two stationary faces, prevents the passage of a particular media through a specified space or opening.
METHOD 21
See "EPA Method 21".
MICRO-VOIDS
The spaces in a gasket, on a micro level, that allow media permeation.
MIRROR FINISH
A bright, polished surface.
MISALIGNMENT
The out-of-line condition that exists between the adjacent face of the equipment/system flanges.
MODULUS
In the physical testing of rubber, the pressure in pounds per square inch or Newtons per square meter of initial square cross-sectional area necessary to produce a stated percentage of elongation, compression or shear. Directly related to the stiffness of the material.
MOLDED TYPE EXPANSION JOINT
An expansion joint in which the entire wall of the joint is molded into a ÒUÓ or convoluted configuration. The joint is manufactured by a molding process.
MOV
Abbreviation for "Motor Operated Valve", a motor-actuated control valve.
MOVEMENTS
The dimensional changes which the expansion joint is required to absorb, such as those resulting from thermal expansion or contraction.
MRO
Abbreviation for "Maintenance and Repair Organization".
MSS
Abbreviation for "Manufacturers Standardization Society of the Valves and Fittings Industry".
MTI
Abbreviation for Material Technology Institute of the Chemical Process Industry.