Glo-Tech Bypass Valves

    Exhaust Gas Recirculation (EGR) valves reduce emissions and increase engine performance 

    Glo-Tech Valve

    Exhaust gas recirculation (EGR) is an effective method to reduce nitrogen oxide (NOx) emissions—and Woodward’s package of integrated products makes EGR not only possible but highly efficient.

    The Glo-Tech™ Bypass Valve (GBV) forms the core of Woodward’s EGR solution which, along with the valve, includes an actuator, linkage, support bracket, and proven actuation technology. The GBV is a high-temperature butterfly valve that regulates compressor boost pressure on turbocharged spark-ignited engines. Constructed of stainless steel and other high-temperature alloys, the Glo-Tech valve can handle continuous gas temperatures of up to 750 °C (1382 °F). Its high temperature rating enables the valve to be located either between the compressor outlet and the aftercooler or downstream of the aftercooler.

    The valve’s bore size is 60mm. No service or maintenance is required.

    The GBV is designed to be positioned by a ProAct™ Digital Plus rotary actuator through an anti-backlash coupling capable of handling considerable misalignment. It can also be coupled with a Woodward F-Series modular actuator.

    Note that the GBV’s function is to regulate system pressure and reduce NOx emissions. It is not designed to be used as a fuel control device.


    Glo-Tech System Hot Valve with R-Series Actuator

    Glo-Tech Hot Valve

    Woodward's newly-designed hot valves driven by the new R-Series electric actuator launch a platform approach to the Glo-Tech products, allowing easy combination of pre-existing or easily configured hot valves and R-Series actuators. This mix-and-match capability delivers innovative hot valve/actuator combinations to the market faster and with minimal engineering costs--a distinct advantage in today's rapidly changing marketplace.

    The Glo-Tech butterfly-type hot valve can handle 650 °C gas temperature with standard materials and up to 780 °C by using high temperature materials. The standard hot valves handle up to 4 bar of differential pressure across the valve while others handle up to 10 bar of differential pressure. 

    The R-Series actuator accepts either a 4 to 20 mA, 0 to 200 mA, or PWM (pulse width modulated) command signal and delivers greater work output due to 75° of rotational travel--all in around 100 ms or less. The actuator combines a brushless DC motor and integral gear box controlled with an on-board electronic control module. It requires a total of only 0.83 A of continuous electrical current, which reduces installation wiring costs. It delivers high resolution positioning of the hot valve (2% over full range and temperature).