Quarter Turn Valve Wikipedia


Operation is similar to that of a ball valve , which allows for quick shut off. Butterfly valves are generally favored because they cost less than other valve designs, and are lighter weight so they need less support. The disc is positioned in the center of the pipe. A rod passes through the disc to an actuator on the outside of the valve. Rotating the actuator turns the disc either parallel or perpendicular to the flow. Unlike a ball valve, the disc is always present within the flow, so it induces a pressure drop, even when open.

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If the handle is turned ninety degrees between operating positions the valve is called a quarterturn valve Butterfly ball valves and plug valves are often quarterturn valves If the handle is circular with the stem as the axis of rotation in the center of the circle

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A butterfly valve is from a family of valves called quarterturn valves In operation the valve is fully open or closed when the disc is rotated a quarter turn The butterfly is a metal disc mounted on a rod When the valve is closed the disc is turned so that it completely blocks off the passageway When the valve is fully open the disc is rotated a quarter turn so that it allows an

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A ball valve is a form of quarterturn valve which uses a hollow perforated and pivoting ball to control flow through it It is open when the balls hole is in line with the flow and closed when it is pivoted 90degrees by the valve handle The handle lies flat in alignment with the flow when open and is perpendicular to it when closed

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Alternatively a quarterturn vanetype actuator produces torque to provide rotary motion to operate a quarterturn valve A pneumatic actuator may be arranged to be springclosed or springopened with air pressure overcoming the spring to provide movement A double acting actuator use air applied to different inlets to move the valve in the opening or closing direction A central

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This makes this kind of plug valve a quarterturn valve There is often a mechanism limiting motion of the handle to a quarter turn but not in glass stopcocks There is often a mechanism limiting motion of the handle to a quarter turn but not in glass stopcocks

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Traditional quarter turn valves and pneumatic actuators are usedonly air is needed to automate a valve Emerson Turn dough a quarter turn  with longest edge parallel to work surface

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Servovalve quarter turn actuators are designed to operate ball butterfly  plug or any other valve with 90 rotation for onoff or modulating service

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Dave Marut of BITORQ Valve Automation explains quarterturn ball valves and their various applications

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Control valves are normally fitted with actuators and positioners Pneumaticallyactuated globe valves and diaphragm valves are widely used for control purposes in many industries although quarterturn types such as modified ball and butterfly valves are also used

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