Actuators & Fuel Valves

The Woodward GS6 gas fuel metering valves are designed to meet the high performance standards required for the control of fuel to industrial gas turbines. The assembly provides reliable, cost- effective interfaces between the electronic engine control system and the gas turbine as applied in power generation, compressor, or mechanical drive applications. The valve can be used in a single valve configuration for single- manifold base turbines or in multiple valve configurations for Dry Low Emission turbines.

The Woodward GS16 gas valve is suitable for use on industrial gas turbine engines with maximum power ratings between 10 and 50 MW. The assembly provides a reliable, cost-effective interface between electronic control systems and gas turbines used in electrical power generation, compressor, or mechanical drive applications. The valve assembly can be used for base turbines or in multiple valve configurations in Dry Low Emission turbines.

The GSOV25 HT fuel isolation valve provides shutdown on a gas turbine by rapidly halting the flow of gaseous fuel. The supply pressure is used to move a spring- loaded piston in the valve. When the valve is energized, gas pressure drives the spring-loaded piston open, admitting fuel to the turbine. When the current signal to the electrical solenoid is interrupted, the spring loaded second-stage piston changes states to vent off primary control pressure. The main spring then forces the primary piston to the seal, stopping all flow.

Woodward’s 3103/TM-55 gas fuel control valve is an electro-hydraulic, stainless steel control valve for use on aeroderivative gas turbines. The valve is capable of metering gas flow between 50 and 40 000 lb/hr (23 and 18,144 kg/hr). It is designed to be corrosion resistant and self-cleaning, allowing it to operate in sour gas environments (high sulfur content gas) that can cause problems for other valves. The proven TM-55 hydraulic actuator provides for robust position control of the 3103 gas metering valve.

The TM-55P Actuator is used on diesel, natural gas, and gasoline engines, or turbines. It is particularly well suited for use in control systems requiring a rotary mechanical output that is proportional to electrical input.

Woodward’s TG-13E/TG-17E self-contained electro-hydraulic actuators are used in the replacement of TG governors with an actuator and electric control system. The TG-13E and 17E proportional electro-hydraulic actuators convert an electrical signal to a corresponding proportional output shaft position in order to position the valve that controls the flow of steam (or energy medium) to the turbine. The actuators are intended for controlling small steam turbines that drive loads such as alternators, dc generator pumps, compressors, fans or papermaking machines.

The TM-25LP and TM-200LP actuators are electric-hydraulic, proportional actuators for positioning steam and fuel-control valves requiring low/high force linear inputs. Factory setting determines if the actuator output shaft extends or retracts on increasing current.

The patented dirt tolerant and self-cleaning technology of Woodward’s VariStroke actuators ensure greater overall reliability of your steam turbine. Their superb accuracy and resolution make them ideal for steam valve control and related turbine speed and load control, where turbine up-time and availability is essential.

The VariStroke-II is a linear electro-hydraulic actuator that is designed to provide the linear actuation force to operate steam turbine control valves or valve racks. This integrated actuator is intended for use on mechanical-drive or generator-drive steam turbines, and uses a low-pressure hydraulic oil source (typically turbine lube oil) to provide its output shaft force.

Woodward’s Electro-hydraulic Power Servo (EHPS) is a fully integrated, three-stage servo valve that drives low-pressure steam turbine control valve cylinders. The EHPS, in conjunction with a new or already installed steam valve cylinder, provides the linear actuation force to operate steam turbine control valves or valve racks. This servo is ideal for retrofits where it is desired to upgrade the turbine control and hydraulic system but replace the expensive steam valve power cylinder.

The SPC is a field programmable servo-driver that controls one integrating or proportional servo-valve, and accepts single or dual feedback signals for valve position sensing.

This compact digital driver can be commanded via a DeviceNet based network, and functions as a DeviceNet slave device on this network. As an alternative or backup to DeviceNet, a (4 to 20) mA input signal can be used to command servo position.