Seal-Less High-Pressure Valve to Prevent Thermal Binding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing high pressure and temperature hose testers face challenges in efficiently cycling high pressure and temperature fluids without causing structural binding due to thermal expansion and contraction, and maintaining long-term operational reliability at extreme conditions.
Innovation Solution
A high pressure and temperature valve design featuring a poppet valve with a threaded stem, a barrel section with flutes to accommodate particles, and a retainer-spring arrangement that accommodates thermal expansion, along with a seal-less configuration using precision-machined D2 steel components and stainless steel biasing members, allowing operation at 700 bar and 150 degrees Celsius for extended cycles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional valve design is used at high pressure and temperature, then the valve can operate initially, but thermal expansion and contraction cause structural binding that reduces reliability
Solution Approach 1:
The valve stem is segmented into multiple sections with clearance gaps between them, allowing each segment to expand and contract independently during thermal cycles. This segmentation prevents the cumulative binding effect that would occur in a solid, continuous stem design, thereby maintaining reliability under thermal stress.
Solution Approach 2:
The valve incorporates localized clearance gaps specifically at the stem segments where thermal expansion occurs, rather than uniformly throughout the entire valve structure. This targeted approach allows thermal movement to be accommodated precisely where needed without compromising the overall structural integrity or sealing surfaces.
2Reliability
If particles are present in the valve system, then contamination occurs, but without particle accommodation features, the valve binds due to particle accumulation
Solution Approach 1:
The valve stem segments incorporate flutes that capture and contain particles within the clearance gaps between segments. By converting the harmful effect of particle accumulation into a contained, harmless reservoir within the flutes, the design prevents particles from interfering with critical sealing and motion surfaces, thereby maintaining reliability.
3Reliability
If a seal-less configuration is used, then maintenance is simplified and reliability at high temperature is improved, but manufacturing precision requirements increase
Solution Approach 1:
The design removes all elastomeric seals and gaskets from the valve construction, extracting the problematic sealing components that degrade at high temperatures. Although this requires precision machining to create the sealing surfaces directly on metal components, it eliminates the need for seal replacement and maintains integrity under extreme thermal conditions.
4Productivity
If the valve operates at extreme conditions (700 bar, 150°C), then testing capability is achieved, but component lifespan is reduced due to thermal and pressure stress
Solution Approach 1:
The valve stem segments are designed with dynamic clearance gaps that accommodate thermal expansion and contraction during operation. This dynamic design allows the valve to adapt to changing dimensional conditions under extreme pressure and temperature, preventing binding and reducing stress on components, thereby extending lifespan while maintaining testing capability.
Solution Approach 2:
The valve incorporates different material properties in various components - D2 tool steel for the body and stem segments providing hardness and wear resistance, with precision-machined surfaces creating metal-to-metal sealing. This composite material approach allows the valve to withstand extreme conditions without compromising component lifespan.
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 enables reliable operation at extreme conditions for over one million cycles, reducing maintenance time and cost by preventing structural binding and extending the lifespan of components, while maintaining high pressure and temperature integrity.
Implementation Method 1
the spring can accommodate thermal expansion and contraction without generating excessive structural forces
Implementation Method 2
The barrel has three lengthwise flutes that can accommodate small particles that could otherwise cause the valve to bind
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The present disclosure is directed to systems and methods which provide a seal-less high temperature and pressure valve for use in many applications.