Temperature Compensated Valve Plunger with Resilient Middle Element
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Solution Overview
Problem
Diaphragm-sealed valves for gas chromatography experience performance variations and potential damage due to temperature-induced changes in material dimensions and diaphragm elasticity, leading to leaks and reduced lifespan, especially under high-temperature conditions.
Innovation Solution
The design incorporates plungers with a resilient middle element and longitudinal play, allowing for compensation of temperature variations and actuating pressure adjustments, which maintains valve performance and reduces manufacturing tolerances, thereby alleviating the issues of leaks and damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If tight manufacturing tolerances are used for plunger length and dimensions, then valve sealing performance is improved, but manufacturing cost and complexity increase
Solution Approach 1:
The patent introduces a compressible intermediate element between the plunger and diaphragm that changes its compression characteristics with temperature. This parameter change allows the system to maintain effective sealing force across temperature variations without requiring tight manufacturing tolerances on plunger dimensions, thereby resolving the contradiction between reliability and manufacturing complexity
Solution Approach 2:
The patent uses a composite structure combining the plunger (rigid component), the compressible intermediate element (elastic component), and the diaphragm (flexible component). This composite approach allows the system to accommodate dimensional variations through the elastic properties of the intermediate element, reducing the need for tight tolerances while maintaining sealing performance
2Ease of operation
If constant actuating pressure is applied to plungers, then valve operation is simplified, but diaphragm damage occurs at high temperatures
Solution Approach 1:
The compressible intermediate element's compression characteristics change with temperature, automatically adjusting the force transmitted to the diaphragm. At high temperatures, the element becomes more compliant, reducing the effective force on the diaphragm even when constant actuating pressure is applied, thus preventing diaphragm damage while maintaining simple operation
Solution Approach 2:
The compressible intermediate element acts as a cushioning element that protects the diaphragm from excessive force. This beforehand cushioning prevents direct transmission of full actuating pressure to the diaphragm, especially at high temperatures where the diaphragm material becomes softer and more susceptible to damage
3Productivity
If the valve operates at high temperatures, then chromatography separation efficiency is improved, but material dimensions and elasticity change causing leaks
Solution Approach 1:
The patent accounts for thermal expansion of valve components by using the compressible intermediate element that can accommodate dimensional changes. As temperature increases and materials expand, the intermediate element's compliance allows the system to maintain proper sealing contact without generating leaks, thus enabling high-temperature operation while maintaining reliability
Solution Approach 2:
The intermediate element's elastic properties change with temperature to compensate for dimensional changes in other valve components. This parameter change ensures that the sealing interface maintains appropriate contact pressure across the temperature range, preventing leaks while allowing the valve to operate at high temperatures for improved separation efficiency
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 solution ensures consistent valve performance across a wide range of temperatures and pressures, reducing production costs and extending the valve's lifespan by compensating for temperature-induced changes and misalignments, while maintaining proper sealing without overstressing the diaphragm.
Implementation Method 1
a resilient middle element provided between the base member and the upper member
Implementation Method 2
material dimensions of all the valve components, as well as the elasticity or the hardness of the polymer diaphragm, change with the temperature
Data Source
AI summary
Plungers and plunger assemblies for a diaphragm-sealed valve are provided. Each plunger is adapted to be received in a passage of the valve body and includes a base member and an upper member having a longitudinal play in this passage with respect to the base member. A resilient middle element is provided between the upper and base member. The base member is connected to a plunger actuating mechanism within the valve body. Optionally, the upper member may be self-aligning within the passage. The plunger can be used to compensate for temperature variations experienced by the valve in use.