Kitz B Series - Page 8

DocumentNo.:KE-4025-06                                           5/50
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4.3TypeBSorBSWSpring-ReturnActuator 
Theairpressuresuppliedintotheport〈A〉pushesthepistontotheleftandenergizesitsmovementtorotate
thescotch-yokecounterclockwise,compressingthespring.Thescotch-yokeconvertslinearmovementofthe
piston rod to counterclockwise rotational movement of the shaft, to open or close thevalve, following the
presetmade.
Atthemomenttheairisdischargedtotheatmospherethroughthesolenoidvalve,thespringforcepushesthe
piston to the right direction, and the scotch-yoke activates clockwise rotation of the shaft to reversely
operatethevalve.Airfailurewillcausethevalvereturntotheoriginalopenorclosedpositionautomatically,
followingthepresetmode,unlikethevaluedrivenbyTypeBactuator.
TypeBSWactuatoriscombinationofTypeBSactuatorandahandwheelformanualoperation,anditsdriving
mechanismisexactlysameasthatofTypeBSactuator
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4.4TypeBS-7orBSW-7Spring-ReturnwithManualOperationEquipment
Theairpressuresuppliedintotheport〈A〉and〈A〉pushesthepistontotheleftandenergizesitsmovementto
rotatethescotch-yokecounterclockwise,compressingthespring.Thescotch-yokeconvertslinearmovement
ofthepistonrodtocounterclockwiserotationalmovementoftheshaft,toopenorclosethevalve,following
thepresetmade.
Atthemomenttheairisdischargedtotheatmospherethroughthesolenoidvalve,thespringforcepushesthe
pistonto thereversedirection,and the scotch-yoke activatesclockwise rotation of the shaft to reversely
operatethevalve.Airfailurewillcausethevalvereturntotheoriginalopenorclosedpositionautomatically,
followingthepresetmode,unlikethevaluedrivenbyTypeBactuator.
TypeBSWactuatoriscombinationofTypeBSactuatorandahandwheelformanualoperation,anditsdriving
mechanismisexactlysameasthatofTypeBSactuator.
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Pin
Roller
Scotchyoke
Shaft
Pistonrod
Piston
A
Fig.4
Fig.5
A
A
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