The force limited valve actuator operates on light-duty valves. The actuator includes signal controlled motor which drives a two piece threaded screw-nut drive. The nut connected to the motor and the screw connected to the valve stem. The nut has a spring loaded actuation surface/plate. The nut body has a positional indicator stem used as a valve-motor control. Operationally, the screw-nut-set moves between first, second and third positions. First: actuation plate at neutral and valve-stem at valve OPEN stop (example). Second: screw protrudes outboard of nut and valve-stem at CLOSE stop and actuation plate at neutral. Third: plate moves away from valve-stem (beyond neutral) while stem at CLOSE which third movement is a force sensor. First, second and third positions are all one way screw rotation. Force limited on stem by damper-shock absorber action. The positional indicator effects ON-OFF valve control.

The invention relates to a coupling (10) which comprises a first component (12) and a second component (14) as well as a spring-loaded entrainer (16) which is spring-loaded and mounted on said first component (12), which second component (14) is furthermore rotatably mounted relative to said first component (12) and can be made to rotate in a first direction of rotationthe freewheeling direction (F)and in a second direction of rotationthe blocking direction (S)opposite to said first direction of rotation, which second component (12) furthermore comprises a guide means (18) which is designed so as to prevent a spring-loaded entrainer (16) from engaging said guide means (18) during rotation of said second component (14) in the freewheeling direction (F).

A torque limiting coupling assembly shields a valve actuator from abnormally high levels of torque. In normal operation, an actuator coupling transfers a driving torque from an actuator coupling to a valve shaft coupling and the valve shaft coupling engenders a shaft torque on a shaft of a valve. In torque actuated operation, when a counter torque applied to the shaft coupling exceeds a threshold value, the actuator coupling freely rotates relative to the valve shaft coupling and the driving torque is transferred to a biasing element of the torque limiting coupling assembly rather than to the valve shaft coupling, thereby shielding the valve or the actuator from high levels of torque.

A torque limiting coupling assembly shields a valve actuator from abnormally high levels of torque. In normal operation, an actuator coupling transfers a driving torque from an actuator coupling to a valve shaft coupling and the valve shaft coupling engenders a shaft torque on a shaft of a valve. In torque actuated operation, when a counter torque applied to the shaft coupling exceeds a threshold value, the actuator coupling freely rotates relative to the valve shaft coupling and the driving torque is transferred to a biasing element of the torque limiting coupling assembly rather than to the valve shaft coupling, thereby shielding the valve or the actuator from high levels of torque.

A setting/operating device for operating a valve stem of a regulating valve, including: a sun gear that rotates upon reception of a rotational force from a drive motor; a fixed internal gear fixedly disposed to surround the sun gear and having teeth on an inner peripheral surface; a plurality of planetary gears disposed between the sun gear and the fixed internal gear that rotate in engagement with the sun gear and the fixed internal gear while revolving around the sun gear; a movable internal gear rotatably disposed coaxially with the fixed internal gear, having teeth that engage the planetary gear on an inner peripheral surface; and an output shaft coupled to the movable internal gear and configured to rotate the valve stem of the regulating valve, wherein the planetary gears have a torque limit structure that restricts power transmission when a torque exceeding a certain level is applied.

A setting/operating device includes: a drive motor, a sun gear that rotates by force from the drive motor; a fixed internal gear; planetary gears configured to be rotatable in engagement with the fixed internal gear while revolving around the sun gear; a movable internal gear disposed coaxially with the fixed internal gear and provided so as to be rotatable in engagement with the planetary gears; an output shaft coupled to the movable internal gear and configured to rotate a valve stem of a regulating valve; wherein the planetary gear includes: a first gear portion configured to engage the sun gear and the fixed internal gear, a second gear portion disposed coaxially with the first gear portion and configured to engage the movable internal gear; and an elastically deformable portion having a smaller elastic modulus formed integrally between the first gear portion and the second gear portion.

An electric valve, includes a transmission mechanism, a valve core, and a valve body assembly. The valve body assembly is provided with a valve body cavity, the valve core is located in the valve body cavity, and the transmission mechanism is transmissionally connected to the valve core. The electric valve further comprises a connecting seat, which is fixedly connected to the valve body assembly, and the transmission mechanism comprises an output shaft; the electric valve further comprises a limiting frame, which is located on the radial outer circumference of the output shaft and is fixedly connected to the output shaft, the limiting frame being located on a side of the connecting seat relatively close to the valve core, and the limiting frame and the connecting seat being arranged opposite to each other and having a preset gap.

A torque limiting coupling assembly shields a valve actuator from abnormally high levels of torque. In normal operation, an actuator coupling transfers a driving torque from an actuator coupling to a valve shaft coupling and the valve shaft coupling engenders a shaft torque on a shaft of a valve. In torque actuated operation, when a counter torque applied to the shaft coupling exceeds a threshold value, the actuator coupling freely rotates relative to the valve shaft coupling and the driving torque is transferred to a biasing element of the torque limiting coupling assembly rather than to the valve shaft coupling, thereby shielding the valve or the actuator from high levels of torque.

A control valve includes a valve body and a valve core. The valve core includes a top plate, a bottom plate, a first stop block and a valve core shaft assembly. The valve core shaft assembly includes a transmission connection part. At least part of the transmission connection part is position on the side of the top plate away from the bottom plate. The first stop block is fixedly connected to the top plate to form an integrated structure. The first stop block extends from the top plate in a direction away from the bottom plate. The valve body further includes a top wall part and a second stop block that are positioned at one end in the height direction of the side wall part. The top wall part and the side wall part are integrally formed. The top wall part is provided with a through hole.