Conical Pressure Valve Assembly for Biomass Slurry Surge Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing pressure relief valves are not designed to handle the severe operating conditions of high-pressure flows of particulate substances like biomass, leading to premature failure, leakage, and performance degradation due to trapped slurry particles and surging flow.
Innovation Solution
A valve assembly with a conical valve needle and housing design that includes a replaceable annular ring, actuator-controlled pressure maintenance, and a discharge ring to manage high-pressure flows, ensuring constant pressure and velocity in the flow of materials through a valve body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional pressure relief valve is used to control high-pressure flows of particulate substances, then the valve structure is simple, but the valve suffers from premature failure, leakage, and performance degradation due to trapped slurry particles and surging flow
Solution Approach 1:
The valve body is divided into multiple sections including a surge chamber, a processing chamber, and a discharge chamber. The surge chamber separates the surging flow from the processing chamber, preventing direct impact on the valve needle and seat. This segmentation protects critical components from high-velocity particulate flow while maintaining pressure control functionality.
Solution Approach 2:
A surge chamber acts as an intermediary between the input flow and the valve mechanism. This intermediate chamber absorbs and dampens the surging flow, converting high-velocity turbulent flow into a more stable flow pattern before it reaches the valve needle and seat, thereby preventing particle trapping and reducing wear.
2Productivity
If the valve is designed to handle high-pressure flows of particulate substances, then the valve can process biomass and other materials at high velocities, but the valve experiences extreme wear and premature failure
Solution Approach 1:
The surge chamber provides beforehand cushioning by absorbing and dampening surging flows before they reach the valve mechanism. This pre-cushioning effect protects the valve needle and seat from direct impact by high-velocity particulate matter, reducing wear and preventing premature failure while maintaining high processing capability.
Solution Approach 2:
The valve needle features a conical shape with a rounded tip, and the valve seat has a corresponding curved surface. These curved geometries distribute the contact stress over a larger area during valve closure, reducing localized wear and improving durability while maintaining effective sealing for high-pressure particulate flows.
3Reliability
If the valve operates in severe conditions with surging flow and trapped particles, then the valve can maintain pressure control, but the valve experiences performance degradation due to trapped slurry particles
Solution Approach 1:
The surge chamber extracts and isolates the harmful surging flow and trapped particles from the valve mechanism. By separating the flow conditioning function (performed in the surge chamber) from the pressure control function (performed by the valve needle and seat), the design prevents particle accumulation in critical sealing areas while maintaining pressure control capability.
Solution Approach 2:
The surge chamber converts the harmful surging flow and trapped particles into a beneficial flow-dampening effect. The turbulence and particle accumulation that would normally harm the valve mechanism are instead harnessed to dampen flow variations, creating a more stable flow pattern that improves valve performance and reliability.
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 design maintains consistent pressure and velocity, reducing valve failure and leakage, enabling efficient processing of biomass and other materials at high velocities and pressures, even in turbulent conditions.
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. This allows the valve to be opened until the pressure behind the plug is equal or greater than the force of the output.
Implementation Method 2
The actuator maintains a pressure on the valve needle. In some embodiments, the actuator maintains a pressure of over 1,800 lbf 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.