The object of the invention is a transmission arrangement for a moveable device, such as a door (1) opening mechanism (2) and a method for using a device moved with a hydraulic cylinder (3). The method comprises at least the following steps: producing a signal for moving the device (1) in a first or second direction and sending the signal to the control device, if the signal was a signal to move the device (1) in the first direction, the first pump (11, 12) is started by means of a signal from the control device, and the pump produces fluid pressure on the first side of the hydraulic cylinder (3) in order to move the device (1) in the first direction, if the signal was a signal to move the device (1) in the second direction, the second pump (13, 14) is started by means of a signal from the control device, and the pump produces fluid pressure on the second side of the hydraulic cylinder (3) in order to move the device (1) in the second direction, monitoring the movement and/or position of the device with a sensor (18), which sends information to the control device about the position and/or movement of the device (1), making a decision in the control device about the necessary procedure, starting or stopping the first pump (11, 12) and/or the second pump (13, 14) with the aid of a signal from the control device based on the made decision.

Fluid pressure is produced with centrifugal pumps used with electric motors.

The invention provides an auto-lock hydraulic hoist cylinder device, comprising: a lock actuator, a lock transmission mechanism and a load-bearing mechanism, wherein the load-bearing mechanism includes load-bearing locking shaft, a load-bearing nut is provided on the load-bearing locking shaft, installed on the upper side of the upper end cover of the main hydraulic hoist, a number of protrusions is provided on the lower end of the load-bearing locking shaft, a locking cover is provided with a through hole for the load-bearing locking shaft to pass through, a groove for matching the protrusions is provided on the side wall of the through hole, a piston rod is fixed on the lower end of the locking cover, the lock actuator is provided on the upper end cover, the lock actuator drives the load-bearing locking shaft through the lock transmission mechanism.

Examples described here include a device that has a housing defining a cavity, and a force sensor. The device also includes a first hydraulic actuator positioned in the cavity, and a second hydraulic actuator positioned in the cavity. The first and second hydraulic actuators move between respectively relaxing modes and thrusting modes along respective longitudinal axes. The longitudinal axis of the first hydraulic actuator is substantially parallel to the longitudinal axis of the second hydraulic actuator. The device also includes a first actuated member coupled to the first hydraulic actuator, and a second actuated member coupled to the second hydraulic actuator.

An improved structure of a pneumatic actuator is direct to the pneumatic actuator and a signal transmitter connected thereof and the respective shaft cores are integrated to be one. An assembly slot integrated with a body is spaced on the upper portion of the body of the pneumatic actuator and at the shaft line corresponding to the shaft core, for the signal transmitter to be installed inside the assembly slot. A shaft hole is installed at the position of the bottom of the assembly slot corresponding to the shaft core and the shaft core passes through the body of the pneumatic actuator and the interior of the body via the shaft hole. The assembly slot is covered by a cover plate. Through such a configuration, the originally independent and separated signal transmitter and pneumatic actuator are integrated, thereby ensuring the consistent perpendicularity and concentricity of the shaft cores thereof. Meanwhile, the integration of the signal transmitter and pneumatic actuator can reduce components and save labor for assembly.

A liquid delivery system includes a source of hydraulic fluid and a hydraulic cylinder fluidically coupled to the source of hydraulic fluid and having a hydraulic piston movable between first and second limit positions. The liquid deliver system includes a rod connected to the piston and extending out of the hydraulic cylinder and a sensor device located outside the hydraulic cylinder and configured to sense a position of the rod and to generate a signal indicating the sensed position. The liquid delivery system includes a liquid cylinder comprising a liquid piston, operably driven by the rod, to pump a liquid along a flow path to a fluid applicator.

A position indicator for a rotary drive of a process valve is proposed, which can be mounted on a rotatable indicator shaft of the rotary drive and which has a base indicator element and an additional indicator element, wherein the additional indicator element can be positioned and fixed about a vertical axis in different angular positions. On the base indicator element a plurality of base indicator markings are arranged, while the additional indicator element has an additional indicator markings. In order to indicator various visually perceptible valve-type symbols, the additional indicator element can be positioned, inter alia, in at least one cover angle position, in which it covers at least one base indicator marking, but leaves at least one further base indicator marking uncovered, which together with the always visible additional indicator marking represents the valve-type symbol.

A position-determining actuator includes a rod, a barrel, a wave detector, and a controller. The barrel at least partially surrounds a piston of the rod so as to define a cap-side void and allow the rod to telescope relative to the barrel. The wave detector is associated with the cap-side void and configured to read fluid pressure of a hydraulic fluid disposed in the cap-side void. The controller is configured to receive, from the wave detector, a pressure reading from within the cap-side void; analyze the pressure reading to determine an extension standing wave; and analyze the extension standing wave to determine an extension dimension of the cap-side void.

The present invention relates to a piston cylinder system for a working device, wherein the piston cylinder system comprises at least one tubular element and at least one piston which is guided in the at least one tubular element. The piston cylinder system is characterized in that at least one tubular element consists of high-manganese-steel and the inner side of the at least one tubular element is machined.

A monitoring device for determining at least one position of a displacement piston (1) which is guided longitudinally movably in a housing (7) and, in the housing (7), delimits at least one fluid chamber (3, 5) with a variable volume, which fluid chamber (3, 5) is connected via a pressure supply connector (9, 11) to a pressure fluid control device (13), is characterized in that a volumetric flow regulating device (45) and, following the latter in the direction of the measuring connector (15, 17), a pressure determining device (47) are connected between the pressure fluid control device (13) and the measuring connector (15, 17) of the assignable fluid chamber (5, 3) of the displacement piston (1), which pressure determining device (47) outputs a measuring signal at least when the displacement piston (1) has reached a predefined end position in the housing (7).

A modular actuator assembly which can be used for partial stroke testing of a valve, the assembly having a force module and a tandem piston module. The force module has a primary piston and piston rod interconnected to a shaft which is movably mounted therein. The tandem piston module is connected to the force module and has a tandem piston and piston rod. An indicator plate is connected to the piston rod and is selectively positionable on the tandem piston rod. The tandem piston rod extends into the force module and acts as a pneumatically engaged hard stop for preventing spurious travel of the primary piston and hence spurious valve travel.