The hydraulic actuator is a key component in the performance of Quick-Closing Non-Return Valves (QCNRV) installed in steam extraction systems. In high-pressure applications such as power generation, these valves protect critical assets from backflow events by ensuring immediate and safe shut-off under any operating condition.
Ensuring Process Safety in Steam Extraction
In power plants operating with steam turbines, Quick-Closing Non-Return Valves (QCNRV) are essential for maintaining safe and efficient steam flow. Positioned in extraction lines, their main function is to prevent the reverse flow of steam that could damage turbine stages during load rejections or shutdowns.
For such applications, response time and actuation reliability are not optional — they are mandatory. This is where the hydraulic actuator plays a decisive role. It enables powerful and fast valve closure, independently of air or electric supply failures.
Hydraulic Actuator with Power Unit (HPU): Core Features
At Babcock Valves, we integrate Hydraulic Actuators with Power Units (HPU) in our QCNRV models when the application demands superior force and controlled actuation. Unlike spring-loaded or pneumatic mechanisms, hydraulic actuation systems deliver smooth, precise movement and reliable closing force in high-pressure environments.
Main components include:
• Hydraulic cylinder designed for single-acting operation
• Power Unit (HPU) supplying hydraulic energy
• Solenoid valve for normal operation
• Three-way valve for manual testing and maintenance
• Limit switches and position transmitters for real-time feedback
• Air set with filter, regulator and pressure gauge (IP65 min.)
The actuator compresses an internal spring with hydraulic pressure. In case of power or signal loss, the spring force ensures the immediate closing of the valve, preventing any backflow into the turbine.
Routine Testing and Maintenance
Babcock Valves strongly recommends incorporating actuator performance testing into routine maintenance schedules. Thanks to the integrated three-way valve, it is possible to simulate actuator operation and verify valve response without interrupting plant operations.
All procedures are clearly described in our I&OM Manual, ensuring that operators can regularly check the system’s reliability and react proactively to any deviation in performance.
A Proven Solution for Demanding Applications
The integration of hydraulic actuator technology in our QCNRV designs reflects our commitment to safety, durability, and performance in industrial flow control. These valves are particularly suited for power plants, where reliability under extreme service conditions is a fundamental requirement.
From design and material selection to final testing, each unit is custom-engineered to meet the plant’s operational and safety demands. You can find more information about our QCNRV at: https://babcockvalves.com/special-valves/#qcnrv
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