Waterjet Control Valve for Composite Material Processing
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Solution Overview
Problem
Conventional waterjet systems face challenges in processing composite and brittle materials due to hydrostatic and stagnation pressures, leading to erosion and damage, and existing techniques for mitigating these issues result in premature wear and increased costs due to pressure cycling.
Innovation Solution
A control valve system configured to decrease fluid pressure downstream while maintaining constant upstream pressure, using a relief valve in conjunction with the control valve to protect system components from fatigue damage, allowing for precise modulation of jet power without excessive wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional waterjet systems use high-velocity jets to process materials, then productivity and erosion rate increase, but composite and brittle materials suffer from delamination, spalling, and cracking due to hydrostatic and stagnation pressures
Solution Approach 1:
The system employs periodic pulsing of the waterjet rather than continuous flow. The pump operates in pulses to create a series of high-velocity jet impacts separated by intervals. This periodic action allows material erosion to accumulate through repeated impacts while giving pressure waves time to dissipate between pulses, preventing the buildup of hydrostatic and stagnation pressures that cause delamination and structural damage in composite and brittle materials.
Solution Approach 2:
The system dynamically adjusts operating parameters including pulse frequency, pulse duration, and jet velocity based on material type and desired erosion rate. By making the jet parameters dynamic rather than static, the system can optimize productivity for different materials while adapting pressure characteristics to prevent harmful effects. The pulsing regime allows real-time control over the balance between erosive force and pressure-induced damage.
2Object-affected harmful factors
If pressure is cycled to mitigate damage to composite materials, then material processing quality improves, but system components experience premature wear and increased maintenance costs
Solution Approach 1:
The patent extracts and isolates the pressure-cycling function from the main pump system by introducing a separate pulsing mechanism. Instead of cycling the entire high-pressure system, only the jet delivery is pulsed while the pump operates continuously at constant pressure. This separation allows material processing to benefit from periodic action without subjecting pump and hose components to repeated pressure cycles, thereby extending component life and reducing maintenance costs.
Solution Approach 2:
A pulsing valve or flow control device acts as an intermediary between the continuous high-pressure pump and the jet orifice. This intermediary component creates the periodic jet pulsing needed for damage-free processing while being positioned to isolate the expensive pump and major components from pressure fluctuations. The intermediary absorbs the cyclic loading, protecting upstream components from wear associated with pressure cycling.
3Productivity
If continuous high-pressure jets are used for processing, then productivity is maximized, but composite materials experience binder erosion and layer separation
Solution Approach 1:
The continuous jet is replaced with periodic pulsing where short bursts of high-velocity water are delivered at controlled intervals. During the pulse duration, material erosion occurs at high rates. During the intervals between pulses, pressure waves generated by jet impact dissipate and redistribute, preventing sustained hydrostatic pressure buildup that would erode binders and separate layers in composite materials. This temporal separation maintains productivity while preserving composite integrity.
Solution Approach 2:
The system applies preliminary low-pressure or pulsed jets before high continuous pressure to pre-pierce or pre-erode the material surface. This preliminary action creates initial openings or channels that reduce resistance for subsequent high-pressure jets, allowing faster material removal without requiring sustained high pressure that would damage composite structure. The preliminary action prepares the material to receive higher productivity-oriented pressure pulses.
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 enables efficient processing of composite and brittle materials by reducing erosion and extending the operational life of waterjet system components, thereby reducing maintenance and operational costs.
Implementation Method 1
A control valve positioned relatively near to a waterjet outlet can be configured to decrease a pressure of fluid downstream from the control valve while maintaining a constant pressure of fluid upstream from the control valve
Implementation Method 2
using a relief valve in conjunction with the control valve to protect system components from fatigue damage
Data Source
AI summary
Waterjet systems including control valves and associated devices, systems, and methods are disclosed. A waterjet system configured in accordance with a particular embodiment includes a fluid source, a jet outlet, and a fluid conveyance extending from the fluid source to the jet outlet. The system further includes a control valve positioned along the fluid conveyance downstream from the fluid source and upstream from the jet outlet. The fluid conveyance has a first portion upstream from the control valve and a second portion downstream from the control valve. The control valve is configured to controllably reduce a pressure of fluid within the second portion of the fluid conveyance relative to a pressure of fluid within the first portion of the fluid conveyance. The first portion of the fluid conveyance is configured to accommodate movement of the jet outlet relative to the fluid source.