Resilient Spray Gun Flow Valve for Low-Maintenance Liquid Control
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Solution Overview
Problem
Spray guns with manually-operated valves, such as needle valves, suffer from high manufacturing costs due to tight tolerances, wear out quickly, and require frequent maintenance, necessitating improved flow control mechanisms.
Innovation Solution
A modified needle assembly and resilient flow control valve system that eliminates the need for precision machined needles and seals, using resilient materials to adjust flow based on differential pressure, forming non-wettable and wettable needle chambers, and incorporating a resilient flow control valve within the liquid passageway.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If manually-operated needle valves are used to control liquid flow, then flow control is achieved, but manufacturing cost increases due to tight tolerances and frequent maintenance is required
Solution Approach 1:
The patent replaces the mechanical needle valve system with a fluid-driven poppet valve system. Instead of using a manually-operated needle with tight tolerances, the invention uses a poppet valve actuated by liquid pressure differential. The poppet valve is driven by the liquid flow itself through pressure differential, eliminating the need for precision-machined needle components and their associated sealing surfaces, thereby reducing manufacturing cost and maintenance requirements.
2Device complexity
If precision machined needles and seals are used, then flow control precision is improved, but device complexity and maintenance requirements increase
Solution Approach 1:
The poppet valve system is self-actuating through pressure differential created by the liquid flow itself. The liquid pressure automatically opens the poppet valve when flow is required, and the spring automatically closes it when flow stops. This self-service mechanism eliminates complex manual actuation systems and precision sealing requirements while maintaining effective flow control.
Solution Approach 2:
The invention changes the control parameter from mechanical needle position to liquid pressure differential. Instead of controlling flow through the precise mechanical positioning of a needle, the system uses the natural pressure differential of the liquid flow to actuate the poppet valve, simplifying the mechanical components while maintaining flow control precision.
3Reliability
If conventional needle valves with seals are used, then liquid flow control is achieved, but wear and maintenance increase over time
Solution Approach 1:
The invention extracts and eliminates the problematic sealing components from the flow control system. By replacing the needle-valve-seal assembly with a poppet valve that opens fully into the flow path, the system removes the sliding seals and packing that are subject to wear. The poppet valve's sealing surface is stationary and subject to minimal wear, dramatically improving durability and reducing maintenance frequency.
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
Reduces component complexity and cost, enhances durability, and simplifies maintenance by eliminating the need for precision machined parts and seals, while maintaining effective liquid delivery control.
Implementation Method 1
The resilient portion has an ability to adjust its opening behavior based upon variations in differential pressure and possesses inherent resiliency to remain in a normally-closed configuration once a pre-determined differential pressure is achieved
Implementation Method 2
a pre-determined differential pressure is achieved across the resilient flow control valve in order for the resilient portion to be opened
Data Source
AI summary
Aspects of the present disclosure relate to a method that includes installing a resilient flow control valve within a portion of a liquid passageway formed in the spray gun system such that liquid is capable of being contained by the resilient flow control valve without leakage. A wettable needle chamber can be coaxial with a portion of the liquid passageway. The present disclosure may also relate to a kit that includes a resilient flow control valve configured to sealingly engage with a portion of a nozzle liquid passageway of a nozzle assembly or directly adjacent to the nozzle liquid passageway.