Methods, apparatus, systems and articles of manufacture are disclosed to diagnose a pneumatic actuator-regulating accessor. An example method disclosed herein includes stroking a fluid valve operatively coupled to a field instrument and a pneumatic actuator-regulating accessory by pressurizing an actuator operatively coupled to the fluid valve. The example method also includes blocking a supply to the pneumatic actuator-regulating accessory and the field instrument, exhausting pressurized air from the actuator via the field instrument, measuring at least one of (1) positions of the fluid valve or (2) an output pressure as the pressurized air is exhausted from the actuator, and identifying a first operation of the pneumatic actuator-regulating accessory based on at least one of a travel rate of the fluid valve or the output pressure, the travel rate of the fluid valve based on the measured positions of the fluid valve.

A main stop valve includes: a hydraulic cylinder; a piston arranged in a hydraulic cylinder; a valve rod connected to the piston; and a valve body connected to the valve rod and configured to block a steam passage. The main stop valve further includes: a pilot cylinder having a communication port in fluid communication with the hydraulic cylinder; a rod connected in parallel with the valve rod and configured to be inserted from one end of the pilot cylinder; a sliding ring provided on the rod; and a pilot sleeve configured to be slidably fitted into an inner surface of the pilot cylinder and slidably fitted into an outer peripheral surface of the sliding ring in a section between the one end of the pilot cylinder and the communication port.

A dual trip manifold assembly (TMA) includes an isolation valve assembly having a first valve configured to receive a flow of fluid from a hydraulic system fluid supply. The first valve is configured to channel the flow of fluid to at least one hydraulic circuit. The isolation valve assembly also includes a second valve configured to receive the flow of fluid from the at least one hydraulic circuit of the at least two hydraulic circuits. The second valve is further configured to channel the fluid flow to a trip header and to receive the fluid flow from the trip header. The first valve and the second valve are synchronized to each other such that rotation of one of said first and second valves causes a substantially similar rotation in the other of said first and second valves header.

A dual trip manifold assembly (TMA) includes an isolation valve assembly having a first valve configured to receive a flow of fluid from a hydraulic system fluid supply. The first valve is configured to channel the flow of fluid to at least one hydraulic circuit. The isolation valve assembly also includes a second valve configured to receive the flow of fluid from the at least one hydraulic circuit of the at least two hydraulic circuits. The second valve is further configured to channel the fluid flow to a trip header and to receive the fluid flow from the trip header. The first valve and the second valve are synchronized to each other such that rotation of one of said first and second valves causes a substantially similar rotation in the other of said first and second valves header.

A stop valve includes a connection-switching part capable of switching a connection state between a rod part having an end portion which is connected to a valve disc and an actuator part which linearly moves the rod part. The connection-switching part includes a concave engaging part which is recessed the rod part, a casing having an accommodation space joined to the concave engaging part formed therein, a plurality of frame pieces, a sleeve part which is movable between the frame piece accommodation position and a frame piece detachment position, and a gas introduction part through which a gas is introduced into the accommodation space. The sleeve part moves from the frame piece detachment position to the frame piece accommodation position using the gas. The casing is in contact with the frame pieces at the frame piece accommodation position when moving toward the second side in the central axis direction.

A stop valve includes a connection-switching part capable of switching a connection state between a rod part having an end portion which is connected to a valve disc and an actuator part which linearly moves the rod part. The connection-switching part includes a concave engaging part which is recessed the rod part, a casing having an accommodation space joined to the concave engaging part formed therein, a plurality of frame pieces, a sleeve part which is movable between the frame piece accommodation position and a frame piece detachment position, and a gas introduction part through which a gas is introduced into the accommodation space. The sleeve part moves from the frame piece detachment position to the frame piece accommodation position using the gas. The casing is in contact with the frame pieces at the frame piece accommodation position when moving toward the second side in the central axis direction.

A trip system for a steam turbine closes a trip-and-throttle valve and a control valve of a steam turbine in an emergency. The trip system includes: an emergency shut-off device that shuts off supply of control oil for the trip-and-throttle valve and the control valve to close the trip-and-throttle valve and the control valve; and a drain device that includes a plurality of solenoid valves connected in parallel and drains the control oil by opening the solenoid valves. The emergency shut-off device includes a cylinder, a piston that slides in the cylinder, a spring that applies biasing force to the piston, a plurality of piston valves provided to the piston, and a plurality of chambers formed by the piston valves.

Proposed are directional control hydraulic valves and a system including the same, the system including: a first valve controlling a flow of a fluid flowing thereinto from a first input port by being interlocked with a solenoid valve that is switched to an excited (on) state or non-excited (off) state; and a second valve connected to the first valve and controlling a flow of the fluid flowing thereinto from the first valve by a fluid flowing thereinto from a second input port or a third input port, wherein at least a part of the fluid having been passed through the first valve is discharged through a first output port and then flows into the second input port or the third input port. In addition, the system including at least two directional control valves may be provide, whereby multiplexing of the system may be implemented.

A turbine overspeed trip test data system is a portable system by which an operator can electronically gather and log data during a turbine overspeed test. A plurality of sensors can be affixed to various components of the turbine for gathering test data to be received by a processing unit to assess the operation of the turbine overspeed trip protection components. The test data may be compiled into a turbine test log. A method for processing the gathered sensor data is also provided.

The method allows to detect flameout in a combustor of a turbine system; it comprises the steps of: A) measuring angular acceleration of a shaft of the or each turbine of the turbine system, B) calculating a flameout indicator as a function of the angular acceleration, and C) carrying out a comparison between the flameout indicator and at least one threshold.