Ceramic Valve Seat Assembly for Slurry Erosion and Thermal Stress

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Conventional autoclave isolation valves experience premature failure due to abrasion, crushing, and erosion from high-velocity slurry flows, leading to leaks and production losses, as ceramic trim materials are brittle and difficult to engineer for large-scale applications.

Innovation Solution

A ceramic valve seat insert with a compliant polymeric sleeve, such as polytetrafluoroethylene, is press-fit into a metal valve seat housing, allowing for relative movement and reducing axial tensile loads caused by thermal expansion differences between ceramic and metal components, enhancing durability and resistance to erosion.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If ceramic trim materials are used in autoclave isolation valves, then resistance to abrasion and erosion is improved, but brittleness and susceptibility to thermal expansion-induced failure worsen

Engineering Contradiction:

Improveresistance to abrasion and erosionVSAvoidsusceptibility to thermal expansion-induced failure

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The valve seat assembly uses a composite structure combining ceramic insert (for abrasion and erosion resistance) with metal housing (for thermal stability) and polymeric material (for stress absorption). This composite approach allows each material to contribute its advantageous properties while mitigating individual weaknesses.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

A polymeric material is introduced as an intermediary between the ceramic insert and metal housing. This intermediary layer absorbs differential thermal expansion stresses, preventing stress transmission to the brittle ceramic material while allowing the ceramic to maintain its wear resistance properties.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Volume of moving object

If large-scale ceramic components are engineered, then valve size requirements are met, but manufacturing difficulty and premature failure increase

Engineering Contradiction:

Improvevalve component sizeVSAvoidmanufacturing difficulty

Core Design Contradiction:

Volume of moving objectVSEase of manufacture

Solution Approach 1:

The valve seat is segmented into multiple components: a metal housing, a ceramic insert, and a polymeric material layer. This segmentation allows each component to be manufactured separately using appropriate processes for each material, avoiding the difficulties of manufacturing large monolithic ceramic components while maintaining the required valve size.

Inventive Principle:

Principle #1Segmentation

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 solution significantly reduces the likelihood of ceramic valve trim failure by mitigating thermal expansion-induced stresses and improving resistance to abrasion and erosion, thereby extending the lifespan of autoclave isolation valves and preventing production losses.

Implementation Method 1

mitigating thermal expansion-induced stresses

Methodology Applied

Scientific EffectThermal expansion: Thermal Expansion

Implementation Method 2

compliant sleeve positioned coaxially around at least a portion of an outer surface of the valve seat insert

Methodology Applied

Scientific EffectElasticity: Elasticity

Implementation Method 3

resistance to abrasion and erosion

Methodology Applied

Scientific EffectAbrasion: Abrasion

Implementation Method 4

resistance to abrasion and erosion

Methodology Applied

Scientific EffectErosion: Erosion

Data Source

PatentUS11022228B2Systems and methods for a plug valve

Publication Date: 2021.06.01 CALDERA ENGINEERING LLC

AI summary

A valve seat is provided herein. The valve seat may include a ceramic valve seat insert positioned within a metal valve seat housing and comprising an indentation corresponding to a retention lip of the metal valve seat housing and a compliant sleeve positioned coaxially around at least a portion of an outer surface of the ceramic valve seat insert.