Plug Valve Dual-Seal Assembly for Low-Torque Hard Sealing
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Solution Overview
Problem
Traditional sealing elements in rotary valves increase torque requirements due to increased friction, limiting the type and cost of rotary actuators needed for effective sealing.
Innovation Solution
A dual-sealing assembly comprising a hard sealing structure made from a rigid material and a soft sealing structure from a resiliently deformable material, which engages the rotary component and valve body respectively, reducing friction and maintaining fluid-tight seals without excessive torque.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a soft sealing element is compressed between the valve body and plug to ensure fluid-tight sealing, then the sealing effect is improved, but the torque required to rotate the plug increases
Solution Approach 1:
The sealing element is divided into two distinct segments: a hard sealing structure (captive ring) and a soft sealing structure (elastomeric material). The hard segment provides structural support and maintains positioning, while the soft segment provides the sealing function. This segmentation allows the sealing function to be separated from the torque-generating compression function.
Solution Approach 2:
The sealing element combines two different materials with complementary properties: a rigid hard material (such as metal or hard plastic) and a resilient soft material (elastomer). The composite structure leverages the strength and dimensional stability of the hard material while utilizing the compliance and sealing capability of the soft material, achieving effective sealing without excessive torque requirements.
2Reliability
If the compression force on the sealing element is increased to maintain sealing under higher pressures, then the sealing reliability is improved, but the frictional forces and torque requirements increase
Solution Approach 1:
The sealing element is divided into two distinct segments: a hard sealing structure (captive ring) and a soft sealing structure (elastomeric material). The hard segment provides structural support and maintains positioning, while the soft segment provides the sealing function. This segmentation allows the sealing function to be separated from the torque-generating compression function.
Solution Approach 2:
The sealing element combines two different materials with complementary properties: a rigid hard material (such as metal or hard plastic) and a resilient soft material (elastomer). The composite structure leverages the strength and dimensional stability of the hard material while utilizing the compliance and sealing capability of the soft material, achieving effective sealing without excessive torque requirements.
3Ease of operation
If a hard sealing material is used to reduce friction and torque, then the ease of rotation is improved, but the ability to conform to surface irregularities and maintain sealing may be reduced
Solution Approach 1:
The sealing element is divided into two distinct segments: a hard sealing structure (captive ring) and a soft sealing structure (elastomeric material). The hard segment provides structural support and maintains positioning, while the soft segment provides the sealing function. This segmentation allows the sealing function to be separated from the torque-generating compression function.
Solution Approach 2:
The sealing element combines two different materials with complementary properties: a rigid hard material (such as metal or hard plastic) and a resilient soft material (elastomer). The composite structure leverages the strength and dimensional stability of the hard material while utilizing the compliance and sealing capability of the soft material, achieving effective sealing without excessive torque requirements.
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 dual-sealing assembly reduces the torque required to rotate the rotary component, allowing for a wider range of rotary actuators and lower energy consumption while maintaining a high contact force for effective sealing.
Implementation Method 1
the soft sealing structure is compressed in a radial direction between the rotary component and the valve body to establish a fluid-tight seal
Implementation Method 2
The soft sealing structure is formed from a resiliently deformable material
Implementation Method 3
reducing friction and maintaining fluid-tight seals without excessive torque
Data Source
AI summary
A rotary valve includes a valve body including an opening formed therein, a rotary component received within the opening of the valve body with the rotary component configured to rotate relative to the valve body about an axis of rotation thereof, and a sealing assembly including a hard sealing structure and a soft sealing structure disposed between the valve body and the rotary component. The hard sealing structure is formed from a substantially rigid material and is configured to sealingly engage the rotary component. The soft sealing structure is formed from a resiliently deformable material and is configured to sealingly engage the hard sealing structure and the valve body.