Methods and apparatus of testing a solenoid valve of an emergency valve via a positioner are disclosed. An example method includes conducting a solenoid valve test by initiating a pulse duration and a monitoring duration for the solenoid valve test. Conducting the solenoid valve test further includes instructing a solenoid valve to transition from a first state to a second state during the pulse duration. The solenoid valve is in fluid communication with an actuator to enable the actuator to actuate an emergency valve. Conducting the solenoid valve test further includes determining a functionality of the solenoid valve by measuring, via a valve positioner, a maximum pressure change of a pressure chamber of the actuator during the monitoring duration. The example method includes, upon determining the solenoid valve is in a functioning state, conducting a partial stroke test of the emergency valve via the valve positioner.

Methods and apparatus of assessing a test of a solenoid valve via a positioner are disclosed. An example apparatus includes a solenoid valve to enable an actuator to close an emergency valve and a valve positioner fluidly and communicatively coupled to the solenoid valve. The valve positioner is to instruct the solenoid valve to transition the solenoid valve from a first state to a second state. The valve positioner is to monitor a pressure change of a pressure chamber of the actuator in fluid communication with the solenoid valve relative to an initial pressure for a monitoring duration. The valve positioner is to identify a maximum pressure change during the monitoring duration and determine a ready state of the solenoid valve when the maximum pressure change is greater than a minimum trip value and the pressure change at a monitoring end time is less than a maximum reset value.

A hydraulic system is adapted to provide at least one of a fluid flow at a variable fluid pressure or a fluid flow at a variable fluid displacement. A pressure sensor measures a fluid pressure. A controller is in communication with the engine and the pressure sensor. Wherein, the controller sends an engine speed signal to operate the engine in an open state and controls the fluid displacement or the fluid pressure of the hydraulic system to a first load condition. Further wherein, the controller detects an engine speed and a fluid pressure of the hydraulic system with the pressure sensor when the engine is in the open state and the hydraulic system is in the first load condition. Further wherein, the controller operably calculates a total engine torque as a function of the detected engine speed and fluid pressure when the hydraulic system is in the first load condition.

Provided is an offshore crane heave compensation control system and method using video rangefinding to achieve heave compensation in a directly driven pump-controlled electro-hydraulic heave compensator. The heave compensation and the heave compensator are applicable for special operation and control requirements on a fixed offshore platform and allow the crane to achieve steady lifting of a load away from or lowering of a load on to a supply vessel without being influenced by the motion of the supply vessel caused by ocean currents, ocean winds, or ocean waves. Also provided is a test platform for the offshore crane heave compensation control system using video rangefinding. The test platform provides a realistic simulation for all lifting and lowering processes of an offshore platform crane in offshore environments to study the motion control of the provided system.

A control and safety system suitable for conveying circuits of pressurized fluids equipped with at least one process valve, the system comprising:a pressure reducer,a pilot element,a control valve,a selector valve,a flow amplifier valve, ea single-acting actuator, wherein the system is provided with a single circuit in which:a supply line of a working fluid directly connects the pressure reducer, to the control valve and to the flow amplifier valve,a signal fluid line, directly connected: to the piloting element and to a manual pilot control element, or to the pilot element and to the pressure reducer and to a non-return valve.

A modular control device for solenoid valve islands, particularly for the actuation of actuators is described, having a control module for controlling a solenoid valve adapted for actuating an actuator, a communication module adapted to exchange information signals with such an actuator and an electrical connection module adapted to receive control signals from a user. The electrical connection module transmits the control signals to the control module and receives the information signals from the communication module. The electrical connection module has a processing and control unit configured to receive, store and process the information signals and the control signals.

A control system includes a pneumatic actuator having a spring that is compressible by a gas and connected to the isolation valve, wherein the gas is supplied to the pneumatic actuator along a gas flow path, a solenoid valve operable between an open position and a closed position, wherein the open position permits the gas to flow along the gas flow path to the pneumatic actuator, a partial stroke test device configured to perform partial stroking of the isolation valve upon reception of a signal from a computer by sending the gas to the pneumatic actuator through a needle valve, and a universal operation hand operated valve configured to send the gas to the solenoid valve or to the partial stroke test device.

A work vehicle includes an operation apparatus for operating a work implement, a valve adjusting a flow rate of a hydraulic oil operating the work implement, an electromagnetic proportional control valve provided in a pilot oil path connecting a pilot oil pressure source and a pilot chamber of the valve to each other and generating a command pilot pressure with a source pressure input from the pilot oil pressure source being used as a primary pressure, and a main controller outputting a command current operating the electromagnetic proportional control valve in accordance with an operation of the operation apparatus. The main controller includes a data table storage unit storing data for predicting an operation speed of the work implement and a calibration unit calibrating data on the condition that an operation onto the operation apparatus is performed.

A compressed-air system having a safety function and a method for operating such a compressed-air system. The compressed-air system contains two working valves, which each can selectively assume an aerating position that aerates a load and a venting position that vents the load. Both working valves are redundantly connected on the output side to the load by means of a separating device. The separating device allows one or the other of the working valves to be separated, while the aeration of the load is maintained, in order to subject the one or the other working valve to an examination of the switching function of the one or the other working valve.

Systems and methods for protecting a turbomachine may include a trip throttle valve having a throttle valve assembly and a trip valve assembly. The trip valve assembly may include a plurality of trip valves fluidly coupled to a hydraulic cylinder of the throttle valve assembly via a first flow path and a second flow path in parallel with one another. The trip valve assembly may also include a plurality of isolation valves fluidly coupled to the hydraulic cylinder via the first flow path and the second flow path. The plurality of isolation valves may be configured to selectively prevent fluid communication between the plurality of trip valves and the hydraulic cylinder to allow testing of one or more of the plurality of trip valves during operation of the turbomachine.