Deaerator 100% Level Control Valve (LCV) - GEKO Valve

Deaerator 100% Level Control Valve (LCV) is a critical automatic flow control valve designed to sustain safe, stable and efficient operation of industrial and power plant deaerator systems. As a purpose-built solution from GEKO Valve for deaerator water level management, this deaerator level control valve delivers accurate 0–100% full-stroke linear level regulation, fully accommodating unit start-up, shutdown, variable-load and full-load operating conditions. It effectively resolves common operational issues including deaerator water level fluctuation, tank overflow, water shortage and feed water pump cavitation, serving as an indispensable component for reliable thermal system level control.

In power plant thermal cycle systems, deaerators eliminate corrosive dissolved gases (oxygen and carbon dioxide) from boiler feed water, protecting piping, boilers and auxiliary thermal equipment from corrosion and extending overall system service life. Stable deaerator water level is the core guarantee for optimal deaeration efficiency and system safety. Excessively high water levels lead to deaerator head overflow, degraded heat exchange performance and excessive vapor carryover; low water levels result in insufficient feed water supply, which may cause feed pump cavitation, unit load reduction and unplanned emergency shutdowns. Engineered with precise flow modulation, robust condition adaptability and zero-leak shut-off capability, the GEKO Deaerator 100% Level Control Valve establishes a dependable closed-loop level control system, ideal for 24/7 continuous and variable-load operation of medium-to-large industrial thermal units.

Core Product Advantages

1. 0–100% Full-stroke Precise Level Control Without Blind Spots

Unlike conventional segmented level control valves with limited regulation range, the GEKO deaerator LCV provides true 0–100% full-opening linear level regulation with no control blind spots. Integrated seamlessly with standard PID closed-loop control systems, the valve modulates its opening in real time based on deaerator water level feedback signals, maintaining a constant, stable water level under all operating modes. Whether during unit start-up, low-load steady operation or full-load running, it minimizes water level oscillation, preserves maximum deaerator heat exchange efficiency and eliminates level-related equipment faults at the source.

2. Superior Stability Under High-temperature & High-pressure Working Conditions

Optimized for harsh deaerator feed water conditions featuring high temperature, system pressure fluctuations and fine water impurities, this GEKO level control valve offers exceptional operational durability. It stably operates at a rated temperature of 130℃ and a rated working pressure of 2.7MPa, with a robust 3.9MPa shut-off pressure that provides ample safety margin for abnormal pressure conditions. The high-strength pressure-bearing valve body and premium temperature & pressure-resistant sealing components effectively resist long-term medium erosion, thermal cycling and pressure shocks. It prevents common valve failures such as jamming, deformation and external/internal leakage, supporting reliable 24/7 continuous operation for thermal power systems.

3. Large-flow Design for Large-scale Thermal Units

Featuring an 8-inch large-caliber design and a high rated flow capacity of 820m³/hr, this 8 inch deaerator control valve adopts an optimized low-resistance flow channel structure to maximize flow efficiency. It fully meets the high-volume make-up water requirements of large-scale thermal power plants, self-owned industrial power stations and waste heat recovery systems. Thanks to its highly linear flow characteristics, the valve ensures smooth, stable flow modulation during variable-load switching, effectively stabilizing thermal system water circulation and improving overall unit operational stability and energy efficiency.

4. High-performance Tight Shut-off for Enhanced Safety Protection

Built for deaerator high-level interlock safety protection, the valve delivers reliable tight shut-off performance under up to 3.9MPa pressure. When encountering system overpressure or ultra-high water level emergencies, it quickly and completely cuts off the feed water passage, preventing deaerator overflow, medium backflow and secondary system failures. Its premium zero-leakage sealing design eliminates internal leakage during static standby, reducing long-term system energy consumption and lowering daily maintenance frequency, significantly enhancing the overall safety and reliability of deaerator thermal systems.

5. Standardized Design with Excellent Compatibility & Adaptability

Adopting international Class 300 pressure standard design, this GEKO deaerator level control valve features universal interface and mounting dimensions, enabling seamless replacement of all mainstream domestic and imported deaerator LCV valves. The modular integrated structure simplifies on-site installation, disassembly and routine maintenance, making it highly adaptable for new thermal power project construction and old power unit renovation and upgrading projects.

Working Principle & System Application Logic

The GEKO Deaerator 100% Level Control Valve is installed in the deaerator feed water make-up loop and operates via intelligent closed-loop automatic control. High-precision liquid level sensors continuously monitor deaerator tank water levels and transmit real-time data to the PLC control system. The valve modulates dynamically: opening wider to increase condensate and make-up water flow when the water level is low, and closing down to reduce inflow when the water level rises above the preset threshold. In extreme high-level fault conditions, it achieves full shut-off for system protection. The 0–100% stepless full-stroke regulation maintains the deaerator water level within the optimal operating range, ensuring stable, high-efficiency deaeration, heat exchange and feed water delivery for the entire thermal cycle system.

Main Application Fields

The high-precision GEKO Deaerator 100% Level Control Valve is widely used in industrial thermal systems that require stable and accurate deaerator level regulation, with typical application scenarios including:

• •Deaerator systems of thermal power plants and heating power plants
• •Deaeration equipment for industrial self-owned power stations and waste heat power generation systems
• •Industrial boiler thermal systems in chemical, textile and metallurgical industries
• •Deaerator systems of large-scale thermal stations for central heating and hot water supply

Conclusion

Combining full-range precise level regulation, high-temperature & high-pressure resistance, large-flow high-efficiency delivery and high-safety tight shut-off performance, the GEKO Deaerator 100% Level Control Valve (LCV) solves the core pain points of unstable water level and low operational safety in industrial deaerator systems. With standardized Class 300 specifications, superior condition adaptability and long-term stable service performance, it stands out as the preferred level control solution for medium and large thermal power deaerator equipment. GEKO’s deaerator LCV valve provides energy-saving, low-maintenance and high-reliability water level control for all types of industrial thermal systems, supporting safe, stable and long-cycle operation of power generation units.

Common Operational Problems & Professional Solutions

During long-term operation of conventional deaerator level control valves in power plant thermal systems, frequent load changes, high-temperature water erosion and pipeline vibration often cause various regulating failures. Below are the most common field problems matched with targeted solutions of GEKO 100% full-stroke LCV valve.

1. Deaerator Water Level Hunting & Fluctuation

Problem Phenomenon: Traditional segmented control valves have obvious regulating dead zones and poor linearity. Under variable load conditions, the water level frequently rises and falls, causing continuous system hunting, which reduces deaeration efficiency and triggers frequent system fine tuning.

GEKO Solution: Adopts optimized linear flow characteristic curve and true 0–100% full-stroke stepless regulation design without blind spots. The valve responds sensitively to tiny water level changes and realizes smooth gradient adjustment, completely eliminating water level oscillation and hunting caused by stepped regulation.

2. Valve Stem Jamming & Inflexible Regulation

Problem Phenomenon: Long-term operation under high temperature and medium erosion leads to stem eccentricity, packing aging and impurity deposition inside the valve body, resulting in unsmooth valve opening/closing and even stuck stroke.

GEKO Solution: Equipped with a dual-guided stem structure to ensure high coaxiality during full stroke movement and avoid eccentric wear. The optimized self-cleaning flow channel prevents impurity accumulation, while high-temperature resistant graphite packing ensures flexible stroke output under long-term thermal cycling conditions.

3. Internal Leakage After Long-term Service

Problem Phenomenon: Frequent opening and closing causes trim abrasion and seat deformation, leading to internal leakage. The valve cannot cut off water flow completely during interlock shutdown, resulting in deaerator overflow risk.

GEKO Solution: Adopts Stellite hard-facing overlay on plug and seat trim, greatly improving anti-erosion and anti-abrasion performance. The valve supports 3.9MPa high-pressure tight shut-off, maintaining zero internal leakage for a long time even after thousands of times of switching operations.

4. Slow Response & Hysteresis Regulation

Problem Phenomenon: Ordinary LCV valves are susceptible to pipeline vibration and air source fluctuation, leading to delayed response, excessive adjustment deviation and failure to track rapid load changes.

GEKO Solution: Matched with high-precision intelligent positioner and anti-vibration actuator structure. It features fast signal response and strong anti-interference ability, accurately tracking PLC control commands to realize real-time water level correction under rapid unit load ramp-up and ramp-down.

5. High Maintenance Frequency & High OPEX

Problem Phenomenon: Conventional valves require frequent shutdown inspection, packing replacement and trim maintenance, causing system downtime losses and high operational costs.

GEKO Solution: Adopts modular integrated structure, supporting inline maintenance without pipeline disassembly. Wear-resistant hard trim and durable sealing components greatly extend maintenance cycle, effectively reducing daily maintenance workload and long-term operating costs.