A hydraulic actuator to which a limit-adjustable mechanical lock device is applied, comprising: a housing having a first hole; side covers coupled at both sides of the housing, and having holder insertion holes formed to be opened toward the first hole side of the housing, and plugs; a first holder of which one side of the outer peripheral surface is inserted into the holder insertion hole at the plug side of the side cover by screw coupling; a second holder fitted and coupled to the inner peripheral surface of the side cover and having one end thereof screw-coupled to the second hole of the first holder; a locking means into which a rod is inserted so as to be movable in an axial direction at a predetermined distance across the second hole of the first holder and the third hole of the second holder.

A powered actuating assembly configured for mounting on a tubular valve body. The actuating assembly includes: (a) an actuator unit configured to impart torque to the valve stem; (b) an actuator mounting plate with a first surface supporting the actuator unit and a second surface configured to engage and resist movement relative to the valve body; and (c) securing links configured to extend around a valve body surface opposite the mounting plate and secure the mounting plate to the valve body.

A valve assembly including a valve body with an inlet port and an outlet port, a flow passage and a valve element disposed within the flow passage, an actuator and a lockout mechanism configured to maintain the position of the valve assembly in an opened position or a closed position. The lockout mechanism can include at least one screw.

A valve actuator (100) and method for controlling such is disclosed. The valve actuator (100) may include a body (126), a piston (134), a first spring (136) displaceable between a primary position (154) and a secondary position (156), and a second spring (138) displaceable between a first position (158a) and a second position (160a). The first and second springs (136, 138) are configured to be simultaneously displaced during movement of the piston (134) from a first piston position (142) to a second piston position (144). The first spring (136) is configured to compress to a higher first spring force (F.sub.1) during displacement from the primary position (154) to the secondary position (156), and the second spring (138) is configured to have a decreasing second spring force (F.sub.2) during displacement from the first position (158a, 158b) to the second position (160a, 160b), the second spring force (F.sub.2) decreasing non-linearly.

A position sensor for a bleed valve with a piston, a valve disc, and a piston linkage to couple the piston and the valve disc, the position sensor includes a coil, and a core assembly, including a core disposed within the coil, a link retainer coupled to the piston, and a connecting rod coupled to the core and the link retainer.

In a rotary actuator comprising a housing containing a piston and having a cover and a base, thread-like guide grooves in the piston, a shaft having a transverse axis and being rotatable about an axis of the rotary actuator which transverse axis engages into the guide grooves, and torque support engaging into guides in the piston, which torque supports are anchored in the housing, wherein the transverse axis on both ends comprises bushes contacting raceways of the guide grooves, each bush is cambered and each raceway is configured with an undercut corresponding to the cambering.

In a rotary drive with a housing that contains a piston, a lid and a bottom, screw thread-like guiding grooves in the piston, a shaft with a rotary axis that can be rotated around an axis of the rotary drive and that encroaches in the guiding grooves, and axially parallel torque supports that are attached in the lid and/or bottom and that are embedded in guidances in the piston, with each torque support having an approximately rectangular external cross-section with a load-specific design to support torques to be transmitted and having longer rectangle sides tangentially to the shaft and shorter rectangle sides approximately in directions towards the axis.

A device for controlling the opening and the closure of a valve includes rotatable element configured to control the position of the rotary valve on the basis of its rotation in a direction or in the opposite direction; and a system that causes the rotation of the rotatable element and includes two antagonist feeder conduits that generate a linear motion. The rotatable element is shaped as a pulley and the system that causes the rotation further includes a wire anchored to the pulley and to the feeder conduits to cause the rotation in a direction or in the opposite direction of the pulley based on the application of a pre-determined traction on the wire obtained through the linear motion generated by the feeder conduits.

A valve assembly for an exhaust system of a vehicle. The valve assembly includes a first housing, a second housing, a valve flap and a spring. The first housing defines an inlet, an outlet, and an exhaust gas passageway in fluid communication with the inlet and the outlet. The second housing is attached to the first housing and defines a compartment. The valve flap is rotatable between a first position restricting exhaust gas flow through the exhaust gas passageway, and a second position whereat exhaust gas flow through the exhaust gas passageway is allowed. The spring is disposed in the compartment and out of the exhaust gas passageway. The spring engages the valve flap to bias the valve flap toward the first position.

A valve with capability to self-anticipate failure has a body which is provided with at least one sensor assembly and a controller. The sensor assembly outputs a plurality of time-dependent sensing signals of a first operation parameter of the spindle of the valve or a plurality of time-dependent sensing signals of a second operation parameter of the valve door of the valve. The controller includes a storage unit, a computation unit, and an informing unit. The computation unit computes out a first trendline of the last plurality of time-dependent sensing signals of the first operation parameter stored in the storage unit or a second trendline of the last plurality of the time-dependent sensing signals of the second operation parameter stored in the storage unit. The computation unit also computes out a first accumulated-time threshold of the valve corresponding to a threshold of the first operation parameter over the first trendline or a second accumulated-time threshold of the valve corresponding to a threshold of the second operation parameter over the second trendline. The informing unit outputs the first or the second accumulated-time threshold to the remote of the valve.