Conical Valve Needle Assembly for High-Pressure Slurry Sealing
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Solution Overview
Problem
Existing pressure relief valves are not designed to handle the severe operating conditions of high-pressure flows of treated liquids or slurries, leading to premature failure, leakage, and performance degradation.
Innovation Solution
A valve assembly comprising a conical valve needle with a wide end diameter at least 4% larger than the inner diameter of the valve body, housed within a valve body with a chamber connecting the input and discharge ends, and an actuator maintaining pressure on the valve needle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional pressure relief valve is used to control high-pressure slurry flow, then the valve structure is simple and easy to manufacture, but the valve assembly experiences premature failure and leakage under severe operating conditions
Solution Approach 1:
The valve assembly is divided into distinct functional components: a valve body with chamber, a separate conical valve needle, a housing with discharge end, and an actuator system. This segmentation allows each component to be optimized for its specific function and facilitates maintenance of the sealing surfaces without replacing the entire assembly.
Solution Approach 2:
The valve needle is axially displaceable within the valve body chamber, and the housing encloses the valve needle when disengaged. This nested configuration allows the valve needle to move freely during operation while being protected and guided by the surrounding structures, improving reliability under high-pressure conditions.
2Reliability
If the valve needle diameter is increased to prevent leakage, then sealing performance improves, but the valve body inner diameter must also increase proportionally
Solution Approach 1:
The valve needle features an asymmetric conical geometry with a wide end diameter at least 4% larger than the valve body inner diameter at the discharge end. This asymmetric design creates an interference fit that ensures positive sealing contact between the valve needle and valve body, preventing leakage without requiring proportional increases in overall valve size.
Solution Approach 2:
The conical shape of the valve needle allows for gradual parameter change from the wide end to the tip, enabling the sealing surface to accommodate pressure variations and maintain contact. The specific parameter of the wide end diameter being at least 4% larger than the valve body diameter provides a controlled geometric relationship that ensures sealing while limiting volume increase.
3Adaptability or versatility
If the valve is designed to handle high-pressure slurry flow, then the valve can operate under severe conditions, but slurry particles become trapped in the valve sealing cycle causing performance degradation
Solution Approach 1:
The conical shape of the valve needle provides a curved sealing surface that facilitates smooth particle passage. The conical geometry allows slurry particles to follow the contour of the valve needle during the sealing cycle, reducing the likelihood of particle entrapment compared to flat or sharp-edged sealing surfaces.
Solution Approach 2:
The conical valve needle geometry creates a gradual parameter change in the sealing interface, allowing slurry to flow smoothly past the valve needle during actuation. This geometric parameter change prevents abrupt flow restrictions that could trap particles, thereby maintaining performance stability under severe operating conditions.
4Ease of operation
If an actuator is added to maintain precise pressure on the valve needle, then continuous pressure control is achieved, but the device complexity increases
Solution Approach 1:
The actuator is configured to maintain pressure on the valve needle through direct mechanical coupling, allowing the system to self-regulate pressure based on the valve needle position and the backpressure from the slurry flow. This self-service mechanism reduces the need for complex external control systems while achieving continuous pressure control.
Solution Approach 2:
The actuator system provides feedback control by responding to pressure differential across the valve needle. The actuator adjusts the valve needle position based on the balance between the applied actuator pressure and the slurry backpressure, achieving precise continuous pressure control through a relatively simple feedback mechanism.
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 valve assembly effectively maintains constant pressure and velocity of the flowing material, reducing the risk of premature failure and leakage, and enabling continuous processing of high-pressure slurries.
Implementation Method 1
When the pressure behind the plug is released the plug is pushed back by the force of the pressure from this output
Implementation Method 2
the plug is pushed back by the force of the pressure from this output
Implementation Method 3
an actuator maintaining pressure on the valve needle
Data Source
AI summary
A valve assembly having a conical valve needle axially displaceable in a bore of a valve body wherein a portion of the larger diameter of the valve needle seats downstream at an annular ring when the valve is closed. There is an open area between one end of the valve body to the annular ring even at closure and nozzles for the input of a liquid. The inner wall of the valve body comprises at least one opening for the entry of a liquid under pressure following output of a slurry or liquid from a tube or pipe. The valve assembly is particularly useful in maintaining a semi-continuous or continuous pressurized flow of biomass from an extruder.