Metals bars used for the purpose of clamping a rectangular/square expansion joint to mating ductwork.

A metal shield that is designed to protect the expansion joint from the abrasive particles in the gas stream and to reduce flutter caused by air turbulence in the gas stream. Baffles/Flow Liners may be welded or bolted into position.

A specific type of internal mixer used to mix rubber or plastic compounds with fillers and other ingredients.

A manufacturing process for making non-metallic sheet that employs a paper-making process using Fourdrinier or cylinder-type paper machines.

A disc spring washer used to live-load a packing gland.

That portion of an expansion joint which accommodates the movement of the joint convoluted or flat.

An expansion joint in which the flexible bellows portion of the joint is made flat and bolted or clamped to metal adapter flanges or frames.

A modified service test in which the service conditions are approximated using laboratory equipment not necessarily identical with the equipment in which the product will be employed.

An angled cut at the seam (or joint) of a packing ring.

A large rod of PTFE; the initial stage of manufacture for skive PTFE.

A mark, deformity, or injury which impairs the appearance.

A raised spot on the surface or a separation between layers, usually forming a void or air-filled space in the gasketing material.

A coating applied to braided packing to fill the area between the fibers, blocking the passage of media through the body of the braid, and improving its sealing characteristics. This may be a grease, an oil, or a PTFE dispersion.

See "Valve Body".

The systematic location of bolt holes in the mating flanges and expansion joint flanges where joint is to be bolted.

A baffle that is designed to be bolted to the breach flange. NOTE: Bolt in baffles/flow liners require the use of a seal gasket.

The amount of twisting or turning effort (expressed as Ft- Lb or N-m) required to turn the nuts on a gland follower. The load that the gland follower exerts on a valve packing set can be expressed in terms of a specific bolt torque.

See "Valve Bonnet".

The flexible element of an expansion joint usually consisting of rubber and rubbercoated fabric.

The outside dimension of the annular space that packing is inserted into. Also called the stuffing box bore.

Yarns or filaments woven together to form a hollow or solid structure. A braid may have a round (Braid over Braid), square (Simple Crossing Pattern), or LATTICE (Interlocking) weave pattern. Braids may have round, square, or rectangular cross-sectional shape.

A type of braiding construction in which a series of round braided layers are braided on top of one another.

A type of braiding construction in which yarns are round braided over a core. Cores may be composed of an elastomer extrusion, a plastic compound extrusion, another braid, or other materials.

The portion of the duct system, usually an angle or a channel that interfaces with the flange of the expansion joint.

The distance between the mating duct flanges in which the joint is to be installed.

A lubricant added to the surface of braided packing. Break-in lubricants are used to protect the packing from charring during the initial start-up of rotating equipment, such as pumps and mixers.

A sealing level that does not exceed 1.0 x 10-4 atm cc/sec of Helium.

An economical method for applying coating to a packing material simply by dipping a container of braid into a tank containing the coating material.

See "Anti-Extrusion Ring".

A rupture caused by internal pressure.

A metallic or carbon ring used to take up excess space in a stuffing box.

A straight cut at the seam (or joint) of a packing ring.