Rotating Bonded Valve Assembly Anti-Friction Ring
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Solution Overview
Problem
Reciprocating pumps used for abrasive fluids face premature valve failure due to high friction and abrasion, leading to increased maintenance costs and reduced service life, as the elastomer sealing elements deteriorate and metal contact surfaces erode.
Innovation Solution
Incorporating an anti-friction ring with a low coefficient of friction, made from materials like nylon or Delrin, between the closure member and biasing member to allow free rotation and reduce wear, along with additional features such as vanes or an external drive mechanism to enhance rotational force and extend service life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional valve assemblies are used with metal-to-metal contact surfaces, then structural strength is maintained, but friction and wear increase leading to shortened service life
Solution Approach 1:
The patent introduces a closure member with a closure surface that interfaces between the seal and the valve body bore. This closure member acts as an intermediary element that rotates during operation, distributing wear across multiple contact points and reducing friction between stationary metal surfaces. The closure member includes features like ribs or protrusions that engage with the valve body, enabling rotational movement while maintaining sealing contact.
Solution Approach 2:
The invention transforms the static metal-to-metal contact into a dynamic system where the closure member rotates during valve operation. This rotation is achieved through asymmetric features on the closure member that engage with corresponding features in the valve body, creating a cam-like action that converts linear sealing motion into rotational movement. The dynamic rotation prevents concentrated wear at a single point.
2Reliability
If elastomer sealing elements are used to maintain positive sealing action, then sealing performance is improved, but the elastomer deteriorates due to abrasion and corrosion
Solution Approach 1:
The closure member serves as a mediator between the elastomer seal and the valve body. Instead of the elastomer directly contacting the valve body bore, the closure member's closure surface provides the interface. This intermediary layer protects the elastomer from direct abrasion against the valve body while maintaining the necessary sealing function.
Solution Approach 2:
The invention changes the contact parameters by introducing rotational movement at the closure surface. Rather than the elastomer sliding linearly against a stationary surface, the rotating closure member creates a dynamic contact pattern that reduces cumulative abrasion. The rotation distributes the mechanical stress and thermal effects across different portions of the elastomer over time.
3Stress or pressure
If valve components are designed to withstand high operating pressures, then pressure resistance is improved, but maintenance complexity and cost increase due to premature failure
Solution Approach 1:
The valve assembly is segmented into distinct replaceable components: the seal, the closure member, and the valve body. This segmentation allows the closure member to be designed as a separate wear-resistant element that can be replaced independently of the expensive valve body. The closure member acts as a sacrificial component that protects the main valve body from wear, extending overall system life.
Solution Approach 2:
The design incorporates a closure member specifically engineered to absorb wear and deterioration before it reaches critical components. By placing this wear-resistant element in the high-stress contact zone beforehand, the system cushions against premature failure of the entire valve assembly, reducing maintenance frequency and costs.
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 anti-friction ring significantly reduces frictional resistance, allowing the closure member to rotate freely and strike the sealing member in different positions, thereby decreasing wear rates and extending the service life of the valve assembly, resulting in lower maintenance costs and increased reliability.
Implementation Method 1
Incorporating an anti-friction ring with a low coefficient of friction, made from materials like nylon or Delrin, between the closure member and biasing member to allow free rotation and reduce wear
Implementation Method 2
the closure member strikes a sealing member in different rotational positions during repetitive cycling of the valve assembly
Data Source
AI summary
Apparatus and methods for constructing a valve assembly comprising an anti-friction ring. The anti-friction ring allows a closure member in the valve assembly to more freely rotate during operation of the valve assembly. Consequently, the closure member strikes a sealing member in different rotational positions during repetitive cycling of the valve assembly.