Non-rising stem globe valve actuation mechanism

Solution Overview

Problem

Globe valves with rising stems in high-pressure applications suffer from amplified minor leakage paths, leading to dangerous fluid emission and require more space for operation due to the rising stem mechanism.

Innovation Solution

A non-rising stem globe valve design with a rotatable actuator and cooperating shapes in the valve body and element to prevent rotation, utilizing a rod with external threads and a valve element with internal threads to ensure axial movement without leakage, and a secondary valve element configuration to equalize pressure and reduce opening force.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a rising stem design is used in a globe valve, then the valve can be operated, but minor leakage paths are amplified leading to dangerous fluid emission

Engineering Contradiction:

Improveleakage preventionVSAvoidfluid emission

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent inverts the conventional rising stem design by implementing a non-rising stem mechanism. The actuator remains stationary while the valve element moves axially within the valve body, eliminating the piston-like outward movement that amplifies leakage paths in traditional designs

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent introduces a threaded rod as an intermediary mechanism between the stationary actuator and the moving valve element. This threaded rod converts rotational motion to axial translation without requiring the actuator to rise, thereby preventing leakage path amplification while maintaining operational functionality

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of operation

If a rising stem design is used in a globe valve, then the valve can be operated, but more space is required above the valve stem for operation

Engineering Contradiction:

Improvevalve operationVSAvoidoperational space

Core Design Contradiction:

Ease of operationVSArea of stationary object

Solution Approach 1:

The patent inverts the conventional rising stem design by implementing a non-rising stem mechanism. The actuator remains stationary while the valve element moves axially within the valve body, eliminating the piston-like outward movement that amplifies leakage paths in traditional designs

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent changes the operational mechanism from vertical displacement of the actuator (rising stem) to axial displacement of the valve element within the valve body bore. This dimensional repositioning allows operation without requiring additional space above the valve

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Object-affected harmful factors

If a non-rising stem design is implemented, then leakage paths are minimized, but the connection between actuator and valve element must convert rotation to axial translation

Engineering Contradiction:

Improvefluid leakageVSAvoidactuator connection mechanism

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The patent replaces the direct mechanical connection of a rising stem with a threaded rod mechanism that converts rotational motion to axial translation. This substitution eliminates leakage paths while achieving the required motion conversion through threaded engagement between the rod and valve element

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent introduces a threaded rod as an intermediary mechanism between the stationary actuator and the moving valve element. This threaded rod converts rotational motion to axial translation without requiring the actuator to rise, thereby preventing leakage path amplification while maintaining operational functionality

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

The non-rising stem design minimizes fluid leakage and reduces the operational space required, allowing safe and efficient high-pressure fluid management without excessive force input.

Implementation Method 1

the connection between the actuator and the valve element comprises cooperating threads formed on the rod and the valve element

Methodology Applied

Scientific EffectScrew mechanism: Screw

Data Source

PatentUS10436330B2Non-rising stem globe valve

Publication Date: 2019.10.08 HAWA VALVES INDIA PRIVATE

AI summary

A valve assembly includes a valve body with an upstream inlet and a downstream outlet and a valve element which is engageable with and disengageable from a valve seat to open and close the valve assembly. The valve body defines a bore with an axis for receiving the valve element. At least part of the bore and of the valve element have cooperating shapes which permit axial movement of the valve element in the bore and prevent rotation of the valve element in the bore. A rotatable actuator is provided, with a connection between the actuator and the valve element operable to convert rotation of the actuator into axial translation of the valve element.