Abstract: A controller with adjustable proportionality range wherein a ring is acted upon by a pressure differential in measuring unit formed as, for example, pairs of bellows or the like. The measuring units have axes of effectiveness which are perpendicular to each other. The ring cooperates as a baffle ring with a pivotable nozzle. The measuring units are articulated in diametrical opposition to the ring with the axes of effectiveness of one of the measuring units extending radially and the axis of effectiveness of the other measuring unit extending tangentially of the ring or in parallel to the tangential direction.The present invention relates to a controller and, more particularly, to a controller with an adjustable proportionality range wherein a ring is acted upon by pressure differences in measuring units formed as, for example, pairs of bellows or the like, having axes of effectiveness which are perpendicular to each other, with the ring cooperating as a baffle ring with a pivotable nozzle.

Abstract: A circuit for pneumatic controllers, a proportional-action range of which is adjustable, with the circuit including at least one differential amplifier having input pressure chambers being exposed to pressures derived between two throttle resistors respectively inserted in the measured value X input line and the desired value W-input line. All of the resistors are constant and a connecting line is interposed between connecting sections of the resistors, with the connecting line being provided with an adjustable throttle resistor.

Abstract: A fluid control valve including a housing clampable between pipe flanges of pipes leading to and from the housing. A valve module is detachably insertable in said housing and includes a valve duct having a cylindrical shaped seat surface and a pivotally mounted valve body having a curved surface conforming in shape to the seat surface. The valve body is pivotally mounted at an extension of the valve duct. The pivot axis for the valve body is spaced from the center of curvature of the valve seat surface.