Valves play a critical role in fluid handling systems by controlling the flow of liquids, gases, steam, and slurries throughout processing pipelines and equipment. They are used to start and stop flow, regulate flow rates, direct flow paths, and prevent backflow to ensure safe and efficient operation.
Common valve control applications include:
- Water treatment plants – regulating water flow through filtration, purification, and distribution process.
- Hydraulic systems – controlling fluid flow to cylinders and motors to manage speed, force, and positioning.
- Chemical processing facilities – maintaining precise flow rates, temperatures, and pressures for consistent product quality.
- Oil and gas pipelines – isolating pipeline sections and controlling transport conditions for safe, efficient operation.
LVDT position sensors are particularly well-suited for valve monitoring because they combine high accuracy, rugged durability, and maintenance-free operation. Their ability to provide real-time, precise valve position feedback helps improve process control, increase system efficiency, enhance safety, and reduce maintenance costs across a wide range of fluid applications.
Key Advantages of LVDTs for Valve Monitoring
High Accuracy and Precision
LVDTs provide highly accurate measurement of valve stem movement, enabling precise control of fluid flow, pressure, and level. Accurate position feedback helps optimize flow regulation, improve process control, reduce energy consumption, and enhance overall system efficiency.
Non-Contact Operation
Unlike contact-based sensors, LVDTs operate without physical contact between moving components. This eliminates mechanical wear, reduces maintenance requirements, and extends sensor life. The non-contact design is beneficial in applications involving frequent valve cycling or continuous operation.
Exceptional Reliability and Repeatability
LVDTs consistently generate the same output for the same valve position, enabling stable and repeatable control performance. Their long-term measurement stability minimizes drift over time, making them ideal for critical process control applications where reliability is paramount.
Rugged Environmental Resistance
Valve control systems are often exposed to harsh operating conditions. LVDTs can be designed to withstand extreme temperatures, high-pressures, corrosive media, vibration, and submerged conditions. This durability makes them suitable for water treatment, oil and gas, chemical processing, power generation and aerospace fluid handling applications.
High Resolution
LVDTs can detect very small valve movements, enabling precise positioning of proportional, servo and control valves. This high resolution supports tighter control of flow rates and process variables, improving system responsiveness, accuracy, and overall efficiency.
Construction
LVDTs offer several design advantages that make them effective in valve monitoring applications:
- Hermetically sealed construction for protection against moisture and contaminants.
- Corrosion-resistant materials for chemical processing and water-treatment environments.
- High vibration and shock resistance for hydraulic and industrial machinery.
- Compact designs that fit within valve actuators and servo valves.
- Pressure-tolerant assemblies for hydraulic and process-control systems.
Real-Time Feedback for Automated Control
Modern fluid handling systems rely on continuous position feedback for closed-loop control. LVDT displacement sensors provide a continuous analog output proportional to valve position, enabling controllers to make rapid adjustments and maintain optimal process conditions. This real-time feedback improves process consistency, reduces waste, and enhances overall system performance.
LVDT Valve Monitoring Applications
Chemical Processing
Major chemical manufacturers rely on LVDTs to continuously monitor valve position throughout their facilities as part of comprehensive process safety, reliability, and efficiency programs.
NewTek Intrinsically Safe LVDTs are widely used for valve position monitoring in the harsh and hazardous environments commonly found in chemical processing plants. These sensors provide highly accurate linear position feedback, enabling operators to verify whether valves are fully open, fully closed, partially open, leaking or experiencing a failure condition.
In an automated process control system, NewTek LVDTs deliver continuous position data that can be integrated with plant monitoring and control platforms. Real-time valve position feedback allows operators to quickly identify issues, optimize flow control and maintain safe, efficient operation of critical process equipment.
Offshore Drilling
In offshore drilling operations, submersible LVDTs are widely used on Christmas tree chokes and other critical vale assemblies to provide position feedback for remote monitoring and control systems. This real-time data allows operators to accurately monitor valve status and make adjustments from the surface to optimize production and maintain safe operating conditions.
NewTek offers submersible LVDTs with AC, DC, or custom digital outputs to accommodate a variety of offshore control system requirements. To withstand harsh subsea environments, the sensors are housed in corrosion-resistant alloys with elevated levels of nickel, chromium, and molybdenum. Even when continuously submerged throughout their service life, NewTek Submersible LVDTs deliver exceptional accuracy and repeatability despite high pressures, temperature fluctuations, and other challenging operating conditions.
In high-pressure, high-temperature wells, NewTek LVDTs are also used to verify the position of interval control valves, production chokes, and hydraulic actuators. Accurate position feedback enables operators to confirm valve status and make precise remote adjustments that support efficient production and process control.
Hydraulic Valves
For internal hydraulic tool applications, including control and safety valves operating deep within the wellbore, NewTek provides Miniature Vented LVDTs that equalize internal and external pressure, helping protect sensor integrity and maintain accurate performance in high-pressure environments.
For applications involving hydraulic and non-hydraulic valves, NewTek offers LVDTs in an isolation tube configuration This isolation tube separates and protects the LVDT core from pressurized fluids and harsh process media while allowing the sensor to accurately measure valve position (open/closed). The position sensor provides electronic feedback as part of a process control system.
