Control Valve Position Feedback Using Hydraulic Pressure

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Solution Overview

Problem

Existing control valves in industrial settings face inaccuracies due to mechanical linkages that are susceptible to vibrations, leading to inefficiencies in maintaining process parameters.

Innovation Solution

A pressure-based position monitoring system that utilizes fluid properties to measure the position of valve components without mechanical linkages, using sensors to detect small pressure changes and generate accurate data for process control.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If mechanical linkages are used to monitor position of components on control valves, then position feedback can be obtained, but the system becomes more complex and susceptible to vibrations in industrial settings

Engineering Contradiction:

Improveposition feedback reliabilityVSAvoidmechanical linkage complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent replaces mechanical linkages with a fluid-based pressure transmission system. A piston connected to the valve stem moves within a fluid-filled chamber, converting mechanical position changes into pressure changes that are transmitted through the fluid to a sensor, thereby eliminating mechanical linkages while maintaining position feedback capability

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent employs hydraulic principles by using an incompressible fluid to transmit position information. The fluid column acts as a mechanical advantage system where small movements of the piston create proportional pressure changes that accurately reflect valve stem position without requiring direct mechanical connection

Inventive Principle:

Principle #29Pneumatics and hydraulics

2Measurement precision

If mechanical linkages are used to monitor position of components on control valves, then position feedback can be obtained, but manufacturing and maintenance costs increase

Engineering Contradiction:

Improveposition measurement accuracyVSAvoidmanufacturing cost

Core Design Contradiction:

Measurement precisionVSEase of manufacture

Solution Approach 1:

The patent replaces complex mechanical linkages with a simpler hydraulic system consisting of a piston, fluid chamber, and pressure sensor. This substitution reduces the number of mechanical parts requiring precision manufacturing and assembly, thereby lowering manufacturing costs while maintaining measurement accuracy

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent creates a simplified copy of the mechanical position information through fluid pressure. Instead of directly measuring mechanical position with complex sensors, the system creates a hydraulic replica of the position data that can be measured more simply with pressure sensors

Inventive Principle:

Principle #26Copying

3Reliability

If mechanical linkages are used to monitor position of components on control valves, then position feedback can be obtained, but the system becomes more susceptible to vibrations in industrial settings

Engineering Contradiction:

Improveposition feedback reliabilityVSAvoidvibration susceptibility

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent eliminates mechanical linkages that are susceptible to vibration by replacing them with a hydraulic system. The fluid-filled chamber and piston design isolates the position sensing mechanism from mechanical vibrations, as the incompressible fluid transmits position information without being affected by vibrational forces

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent introduces an intermediary fluid medium between the valve stem and the position sensor. This fluid column acts as a buffer that isolates the sensing system from vibrations while accurately transmitting position information through pressure changes

Inventive Principle:

Principle #24Intermediary (Mediator)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This approach enhances accuracy and simplifies construction, reducing manufacturing and maintenance costs while providing reliable process parameter management.

Implementation Method 1

uses pressure to monitor position of components on a control valve

Methodology Applied

Scientific EffectFluid pressure: Pressure Gradient

Implementation Method 2

use of 'head pressure' in a fluid column

Methodology Applied

Scientific EffectHydraulic pressure: Hydraulic Press

Data Source

PatentUS12607278B2Using pressure to monitor position of components on a control valve

Publication Date: 2026.04.21 DRESSER LLC

AI summary

A position monitoring system is configured for use on control valves and other flow controls. These configurations include a motion sensitive unit, for example, a flexible tube with one end that can move in conjunction with a valve stem on the flow control. The flexible tube may hold synthetic oil. Another end of the tube may couple with a pressure senor. In use, this senor may generate a signal that corresponds with head pressure of the synthetic oil in the tube. Operating hardware on the flow control, for example, processing hardware that is part of a valve positioner or controller, may process the signal from the pressure sensor to identify a operating condition of a valve, for example, a position for a closure member of the valve.