Rotary Plug Valve Seal Retention for Low-Torque Sealing
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Solution Overview
Problem
Conventional rotary plug valves experience excessive torque and wear due to high sealing forces required to manage pressure differentials, leading to reduced operational life and increased energy consumption.
Innovation Solution
A fluid valve assembly with a valve plug and sleeve configuration that utilizes fluid pressure to facilitate sealing, reducing torque requirements and incorporating an elastic member for initial bias, thereby minimizing seal wear and energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high sealing force is applied to seal the valve at maximum pressure differential, then fluid-tight sealing is achieved, but torque requirement increases and seal wear increases
Solution Approach 1:
The seal configuration allows the seal to dynamically adapt to pressure differential changes. The seal is positioned and biased to provide optimal sealing at different pressure conditions without requiring constant high torque, resolving the contradiction between maintaining fluid-tight sealing and reducing torque requirements.
Solution Approach 2:
The invention changes the sealing parameter from relying on high compression force to utilizing a specific seal geometry and positioning system. The seal's shape and its interaction with the valve body and plug create effective sealing through geometric constraints rather than purely force-based compression, reducing torque while maintaining reliability.
2Reliability
If high sealing force is applied to seal the valve at maximum pressure differential, then fluid-tight sealing is achieved, but seal wear increases and operating life reduces
Solution Approach 1:
The dynamic seal configuration allows the seal to operate under varying stress conditions rather than constant high compression. This reduces cumulative wear on the seal material and extends the operating life while maintaining fluid-tight sealing when needed.
Solution Approach 2:
The invention uses an elastomeric seal that is designed to be replaced rather than maintained indefinitely. The seal geometry and positioning system maximize the service life of this replaceable component while ensuring reliable sealing during its operational life, addressing the contradiction between sealing reliability and component longevity.
3Reliability
If oversized actuator is used to accommodate manufacturing tolerances and dimensional changes, then valve operation reliability is improved, but device complexity and cost increase
Solution Approach 1:
The invention changes the approach to tolerances by using an elastomeric seal that can elastically deform to accommodate dimensional variations. This eliminates the need for oversized actuators designed for worst-case tolerance scenarios, reducing actuator size and complexity while maintaining reliable operation across the full range of manufacturing variations.
Solution Approach 2:
The elastomeric seal acts as a flexible element that compensates for manufacturing tolerances and thermal expansion. This flexible sealing approach replaces the need for rigid, oversized components, reducing overall device complexity while ensuring reliable valve operation under varying conditions.
4Reliability
If high sealing force is continuously applied, then fluid-tight sealing is maintained, but energy consumption increases
Solution Approach 1:
The seal system dynamically adjusts the sealing force based on operating conditions rather than maintaining constant high compression. This reduces the energy required to maintain sealing, as the actuator only needs to overcome the actual pressure differential plus a minimal bias force, not the maximum possible force required for worst-case sealing.
Solution Approach 2:
The elastomeric seal and its biasing mechanism create a self-regulating sealing system that automatically provides appropriate sealing force for the current pressure differential. This eliminates the need for the actuator to continuously apply high force, allowing the system to operate with minimal energy input while maintaining fluid-tight sealing.
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 reduces torque requirements, extends the operational life of the valve, and allows for a smaller, more energy-efficient actuator motor, while maintaining fluid-tight sealing.
Implementation Method 1
an elastic member that is disposed in the groove between a blind end of the groove and the seal, the elastic member providing a force that directs the seal against an inner surface of the valve plug chamber
Implementation Method 2
utilizes fluid pressure to facilitate sealing, reducing torque requirements
Data Source
AI summary
A fluid valve includes a valve body and a plug. The body includes a chamber and ports that communicate with the chamber. The plug is rotatably disposed in the chamber, and includes a seal disposed in an annular groove provided on the plug surface. An elastic member is disposed in the groove, and biases the seal against an inner surface of the chamber. The seal includes a seal retaining feature that is configured to retain the seal within the groove.