Press-Fit Valve Insert for Low-Stiction Wear-Resistant Sealing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Hydraulic valves and regulators face issues with stiction, wear, and corrosion, leading to inefficiencies and high maintenance costs, particularly in subsea environments, due to static friction and the limitations of carbide and stainless steel materials.
Innovation Solution
The use of non-ferrous single crystal materials like ruby or sapphire, or carbide materials, as inserts in hydraulic control components, with a press fit connection and a conformable intermediary, allows for lower friction sliding interfaces, reduced wear, and improved alignment, thereby reducing stiction and corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If carbide materials are used for sliding surfaces to reduce wear, then wear resistance is improved, but stiction increases significantly
Solution Approach 1:
The patent combines carbide insert (for wear resistance) with stainless steel body (for low stiction) to create a composite valve structure. The carbide insert is press-fitted into a recess in the stainless steel valve component, creating a hybrid material system that leverages the advantages of both materials while mitigating their individual disadvantages.
2Strength
If carbide components are used to reduce wear, then wear resistance is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The valve component is divided into separate segments: a stainless steel body and a carbide insert. This segmentation allows each part to be manufactured using optimal processes for its material (stainless steel by conventional machining, carbide by sintering or casting), then assembled through press-fitting, reducing overall manufacturing complexity compared to making the entire valve from carbide.
Solution Approach 2:
The patent combines carbide insert (for wear resistance) with stainless steel body (for low stiction) to create a composite valve structure. The carbide insert is press-fitted into a recess in the stainless steel valve component, creating a hybrid material system that leverages the advantages of both materials while mitigating their individual disadvantages.
3Reliability
If redundant components are added to ensure reliability, then system reliability is improved, but system complexity and cost increase
Solution Approach 1:
The carbide insert is designed as a replaceable component that can be independently serviced. When worn or damaged, only the insert needs to be removed and replaced, not the entire valve assembly. This modular approach maintains high reliability while reducing system complexity compared to using fully redundant valve systems.
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 configuration significantly reduces the force required to initiate movement of valve components, decreases wear and corrosion, and enhances the reliability and efficiency of hydraulic control circuits, minimizing the need for redundant components and maintenance.
Implementation Method 1
the sleeve is compressed, but not sheared, during the press fitting operation such that it provides a frictional force against adjacent surfaces of the insert and the valve component to prevent the insert or sleeve from backing off
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A shear seal includes a seal plate (105) having a first seal surface (106) and a sliding seal assembly (170) having a second seal surface (181), and at least one of the first and second sealing surfaces comprise an insert (190) comprising a material different than that of the seal plate or the sliding seal, said insert being connected to the seal plate or sliding seal assembly by a compressed member (450) disposed between the insert and the adjacent surface of seal plate or sliding seal assembly.