Determines its ability to regulate or control the flow within the system, the smaller the valve, the finer the control.
The part of the part of the valve that controls the flow of fluid through the valve.
4 different types. Can be used for isolation/regulation of a flow. When used for regulation it is a control valve. Has a tight seal and good throttling.
Withstand differences in flow, temp. and pressure.
To start, stop, or regulate a flow of liquid or gas through a plant system
Disc is renewable like its seat rings, good for heavy duty throttling.
Renewable and can be adapted to varying types of flow.
Verticales
Distinguished from a regular globe valve by the shape and arrangement of the disc and seating areas.
By Disc arrangement, function, operating conditions (such as temperature/pressure), or the way they attached to a plant system (flanging, welding, threading, etc.)
Permits the flow through the system
From very small (1.28'' or .31cm) to (several feet or meters in diameter)
Not designed to control the rate of flow. Usually wedge shaped to fit between the seats. Most often found in liquid systems. Either fully open/closed or isolation.
Fits on a tapered, flat surface seat and is used for relatively low pressure, low temp systems.
Very narrow/best suited for close regulation of the flow.
Characterized by the materials that comprise their disc. Flexible rubber material. Effective seal for leakage into other parts of the valve. Often is system carrying fluids (harmful gasses) where any leakage could be dangerous. Also used where corrosion may be a problem.
Light in construction. Found on large instillations where pressure is not high. Disc is attached to the stem and swings open/closed. Primarily used for isolation of the flow.
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