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Actuator

Device used to operate a valve using electric, pneumatic or hydraulic means. Often used for remote control or sequencing of valve operations.

Alloy steel

A steel consisting primarily of iron with some percentage of one or more other elements such as chromium, nickel, manganese, or vanadium deliberately added to enhance its properties.

Ambient temperature

The prevailing temperature of the environment immediately surrounding an object - generally considered to be -20° F to +100° F.

Austenitic stainless steel

The common stainless steel, where the primary micro structure is austenite and the composition primarily iron but also includes both chromium and nickel. The steels are designated as 300 series such as 304, 316, CF8M, etc.

Bevel gear operator

Device facilitating operation of a gate or globe valve by means of a set of bevel gears having the axis of the pinion gear at right angles to that of the larger ring gear. The reduction ratio of this gear set determines the multiplication of torque achieved.

Back seat

A shoulder on the stem of a gate or globe valve which seals against a mating surface inside the bonnet to prevent leakage of media through the bonnet stuffing box when the valve is fully opened.

Ball

The closure element of a ball valve.

Ball valve

Ball valves are reliable and simple to use as a shutoff valve or flow metering valve. Just a quarter turn of the handle opens or closes the valve. Handle position lets you "see" the valve's position.

Bolted bonnet

A bonnet which is connected to a valve body with bolts or studs and nuts.

Bolted construction

Describes a valve construction in which the pressure shell elements (such as body and closures of a trunnion ball valve) are bolted together and so can be taken apart and repaired in the field.

Bonnet

The top part of a valve, attached to the body, which contains the packing gland, guides the stem, and adapts to extensions or operators.

Bore (or port):

The inside diameter of the smallest opening through a valve, e. g., inside diameter of a seat ring, diameter of hole through ball in a ball valve.

Butt weld end (BWE)

The end connection of a valve suitably prepared for butt welding to a connecting pipe.

Butterfly Valves

Butterfly valves are used where economical, high capacity valves are needed. Resilient liners provide bubble tight shutoff in general service applications. High-performance butterfly valves provide excellent flow control, and Triple offset metal seated butterfly valves are designed for high pressure and high temperature severe service applications.

Carbon steel

Iron containing carbon in the form of carbides, about 0.1 to 0.3 percent carbon with no other alloying elements other than the sulfur, phosphorus, and other elements present in almost all steels.

Cast iron

The common term for cast gray iron or iron containing flake carbon in the range of _% to 2 _%. Cast iron is brittle, exhibiting very little ductility before fracturing.

Casting

A product or the act of producing a product made by pouring molten metal into a mold and allowing it to solidify, thus taking the shape of the mold.

Charpy impact test

A destructive mechanical test conducted on a precisely machined coupon of steel to be tested. The coupon is clamped in a special machine and subjected to lateral hammer blow. The test provides a relative measure of the toughness of the steel or its resistance to shock or impact loads and is usually required for material used in low temperature applications.

Check valve

A one-directional valve which is opened by the fluid flow in one direction and closed automatically when the flow stops or is reversed.

Clapper

The hinged closure element of a swing check valve.

Closure element

The moving part of a valve, positioned in the flow stream, which controls the flow through the valve, e. g., wedge, plug, clapper, ball.

CWP

Cold working pressure - the maximum allowable pressure under non-shock conditions at ambient temperature ( -20° F to +100° F).

Dezincification

A form of pitting corrosion which attacks certain zinc bearing copper-based alloys, often called "yellow brasses", when in contact with sea water or fresh water that is high in oxygen and carbon dioxide. (ASTM B61 and B62 are "red brasses" and not susceptible to dezincification.)

Double block and bleed

The capability of a valve under pressure to obtain a seal across both the upstream and downstream seat rings and to have its body cavity bled down to atmospheric pressure.

Drain plug

A fitting at the bottom of a valve, the removal of which permits draining and flushing the body cavity.

Diaphragm Valves

Diaphragm valves have excellent shut-off and flow control characteristics. A flexible molded diaphragm regulates flow, provides tight shutoff, and isolates the fluid from the environment. The valve consists of the body, diaphragm, and handwheel assembly. Their simple design and wide choice of materials make them ideal for corrosive, abrasive, and sanitary services.

Elastomer

A natural or synthetic elastic material, often used for o-ring seals. Typical materials are viton, buna-n, EPDM (ethylene propylene dimonomer), etc.

End connection

The type of connection supplied on the ends of a valve which allows it to be connected to piping - may be weld end, flanged end, threaded or socket weld.

Fitting

Any component, other than valves, used with pipe as part of the pressure system and normally referring to items covered by a national standard.

Flat Face (FF)

A flange surface in which the gasket sealing area is the entire surface from the ID to the outside edge. Usually used for class 125 cast iron valves.

Float Valves

Float valves automatically control liquid level and prevent overfilling tanks. The valve is operated mechanically by a float which rests on top of the liquid. As the liquid level rises, it pushes the float up and closes the valve. As the level falls, the valve opens. The amount of liquid pressure the valve can shutoff against is determined by the length of the rod and size of the float.

Floating ball

A ball valve design in which the ball is not rigidly held on its rotational axis and so is free to float between the seat rings.

Fire safe

A valve design that is capable of passing a fire test with specified limits on leakage to the atmosphere and downstream after being closed subsequent to fire exposure.

Full bore

Describes a valve in which the bore (port) is nominally equal to the bore of the connecting pipe.

Full penetration weld

Describes the type of weld wherein the weld metal extends through the complete thickness of the parts being joined.

Gasket

A component whose purpose is to seal a joint between two larger components, softer than the surfaces of the joint being sealed and usually squeezed by means of bolting to effect the seal.

Gate valve

A straight through pattern valve in which closure element is a wedge situated between two fixed seating surfaces, with means to move it in or out of the flow stream in a direction perpendicular to the pipeline axis. Used as a block valve, or on-off valve.

Globe valve

A valve whose closure element is a flat disc or conical plug sealing on a seat which is usually parallel to the flow axis. Can be used for throttling services.

Graphite

Flexible carbon material used to make gaskets and packing. The gaskets may be flat graphite sheet or have metal inserts for added strength. The packing is a combination of lattice braided rings used as anti-extrusion or wiper rings and die-formed rings which are compressed to effect the seal.

Malaysia Valves Supplier & Distributors - Encord Sdn Bhd