Rotary Shear Valve Polymer Insert for High Pressure Sealing
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Solution Overview
Problem
Current high-pressure liquid chromatography shear valves with metallic and polymer components are limited in pressure rating and valve lifetime, failing to consistently achieve pressures above 15 Kpsi and lifetimes greater than 10K cycles.
Innovation Solution
A rotary shear valve assembly featuring a stator and rotor with hard, planar faces made of metallic or ceramic materials, coated with tribological coatings like Diamond Like Carbon (DLC), and incorporating a polymer insert for press-fit insertion, enabling a fluid-tight, low-friction seal capable of withstanding high pressures and extended cycles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If a metallic element and polymer material combination is used in the rotor-stator interface, then the valve can operate at high pressures, but the pressure rating is limited to below 15 Kpsi and valve lifetime is limited to about 10K cycles
Solution Approach 1:
The patent employs composite material construction by integrating a polymer insert within a metallic rotor structure. The rotor consists of a metallic body providing structural strength, while a polymer insert (such as PEEK or Vespel) is press-fit into a recess in the rotor face to provide the sealing surface. This composite approach combines the advantages of metal (structural integrity, pressure resistance) and polymer (low friction, sealing capability), enabling the valve to withstand pressures above 15 Kpsi while achieving lifetimes exceeding 50K cycles.
2Stress or pressure
If hard-on-hard sealing surfaces are used, then the valve can withstand higher pressures, but wear and degradation increase at high-pressure points
Solution Approach 1:
The patent changes the material parameter at the sealing interface by using a polymer insert with specific tribological properties (low coefficient of friction, high compressive strength, chemical inertness) instead of a hard-on-hard metallic interface. The polymer material parameters (such as PEEK or Vespel with specific molecular weight, crystallinity, and additive packages) are selected to optimize both pressure承受能力 and wear resistance. This parameter change allows the sealing surface to conform under pressure while maintaining low friction and minimal wear over extended cycle life.
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 provides a durable, fluid-tight seal at the rotor-stator interface, supporting pressures up to 25 Kpsi and exceeding 50K cycles, while reducing wear and degradation at high-pressure points, thus enhancing the valve's lifecycle and performance.
Implementation Method 1
The insert device is formed and dimensioned for press-fit insertion in an insert receiving groove defined in the other of the rotor face and the stator face
Implementation Method 2
a tribological coating disposed atop at least one of the rotor face and the stator face
Implementation Method 3
Such a coating, for instance, is a Diamond Like Carbon coating (DLC)
Implementation Method 4
the polymer insert device is composed of a high compressive strength material, which includes a natural PAEK, a filled PAEK (or PEEK) or a polyimide material such as VESPEL®
Data Source
AI summary
A multi-position rotary shear valve assembly having a metallic or ceramic stator device and a metallic or ceramic rotor device. The stator device defines a planar stator face and two or more stator channels in fluid communication with the stator face at corresponding stator ports, while the rotor device includes a substantially planar rotor face defining one or more rotor channels. A tribological coating is disposed atop at least one of the rotor and stator face. The valve assembly includes a polymer insert device defining an exposed contact face having an inner diameter less than that of the outer circumferential edge and an outer diameter more than the outer circumferential edge. The insert device is formed for press-fit insertion in a groove defined in the rotor face. The outer circumferential edge of the stator face contacts the insert exposed face during rotation between the two or more rotor positions.