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About Butterfly Valves
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Butterfly valves are quick opening valves that consist of a metal circular disc or vane with its pivot axes at right angles to the direction of flow in the pipe, which when rotated on a shaft, seals against seats in the valve body. They are normally used as throttling valves to control flow. Butterfly valves control the flow of gas or liquid by means of a disk, which turns on a diametrical axis inside a pipe or by two semicircular plates hinged on a common spindle, which permits flow in only one direction.  These valves offer a rotary stem movement of 90 degrees or less, in a compact design.  Unlike ball valves, butterfly valves do not have any pockets in which fluids may become trapped when the valve is closed.

Butterfly valves are available in several body styles and seal types.  The flange type or lug style can be held between flanges of any type. Wafer valves are installed between two flanges using bolts or nuts and studs, while lug style valves have metal inserts installed in the valve's bolt holes and the valve is installed between two flanges using a separate set of bolts for each flange.  If the wafer style is used, avoid placing it between either slip-on or screwed flange types. Some wafer body styles will not form a proper seal. The wafer style is used more commonly and is cheaper than the lug style.

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Products & Services Related to Butterfly Valves
Check Valves
Check valves are self-activating safety valves that permit gases and liquids to flow in only one direction, preventing process flow from reversing. They are classified as one-way directional valves. 
Globe Valves
Globe valves are linear motion valves with rounded bodies, from which their name is derived.  They are widely used in industry to regulate fluid flow in both on/off and throttling service. 
Needle Valves
Needle valves are small valves used for flow control in liquid or gas services. The fine threading of the stem and the large seat area allow for precise resistance to flow.
Pinch Valves
Pinch valves includes any valve with a flexible elastomer body that can be pinched closed, cutting off flow, using a mechanism or fluid pressure.
Pressure Relief Valves
Pressure relief valves are self-actuated safety valves designed to relieve excess pressure upstream from the line.
Solenoid Valves
Solenoid valves are devices that use a solenoid to control valve activation.
Solids Valves
Solids valves are used to control or regulate the flow of powder, granular and other bulk solid materials along a process line, or to and from process units, storage bins, conveyors and product packaging.

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Chapter 5: Manual Operators and Actuators: Section 5.1 - Introduction to Manual Operators and Actuators
5.1.1 Purpose of Manual Operators and Actuators With most valves, some mechanical device or external system must be devised to open or close the valve, or to change the position of the valve if it is... (Read More)
Chapter 5: Manual Operators and Actuators: Section 5.1.3 - Definition of Actuators and Actuation Systems
5.1.3 Definition of Actuators and Actuation Systems Automatic control of valves requires an actuator, which is defined as any device mounted on a valve that, in response to a signal, automatically... (Read More)

Engineering Web: Butterfly Valves
Pages: 1 - 3 of 411
Butterfly Valves, Butterfly Valves Manufacturers, Butterfly...
of wafer check valves, sight glass valves, sluice valves, non-return valves, globe valves, gate valves, ball valves, balancing valves, pulp valves,
Rotary Valves and Actuators
Butterfly Valves Ball Valves Segmented Ball Valves- Design V150 Vee-BallĀ® Control Valve
Baumann Valves

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Part Numbers for Butterfly Valves
Part # Distributor Manufacturer Product Category Description
A41BUTTERFLY PLC Radwell FISHER CONTROLS Not Provided VALVE
14303DSE12 PLC Radwell APOLLO Not Provided BUTTERFLY VALVE 3INCH DUCTILE
ML324E4INCH PLC Radwell MILWAUKEE VALVE Not Provided BUTTERFLY VALVE 4INCH
14304CSE12 PLC Radwell APOLLO Not Provided BUTTERFLY VALVE 4INCH CAST IRON
BBVSCS02 PLC Radwell MILWAUKEE VALVE Not Provided BUTTERFLY GROOVED VALVE 2INCHA

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