Valve Assembly Rotational Feel and Flow Isolation
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Solution Overview
Problem
Conventional fluid control valves face issues such as significant contact between potable water and leaded brass housings, complex assembly processes, high maintenance needs due to multiple O-ring seals, and inconsistent rotational resistance, which affect the reliability and user experience of single control valves.
Innovation Solution
A single control valve assembly with a ceramic disk configuration that reverses water flow downward, reducing contact with the valve housing, and includes a bonnet nut with controlled rotational resistance and a U-shaped retainer clip for simultaneous hose attachment, minimizing labor costs and wobble.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional brass housing is used, then manufacturing cost and machinability are improved, but contact between potable water and leaded brass increases causing health concerns
Solution Approach 1:
The patent extracts the flow path from contact with the brass housing by creating a dedicated flow channel that isolates potable water from the housing material. The flow channel is configured to guide water through the valve body without substantial contact with the brass surfaces, thereby removing the harmful interaction while preserving the structural integrity and manufacturability of the brass housing.
Solution Approach 2:
The patent introduces an intermediary flow channel structure that mediates between the brass housing and the potable water. This flow channel acts as a barrier that allows water to pass through the valve while preventing direct contact with the leaded brass housing, thus protecting against lead contamination while maintaining the housing material's manufacturing advantages.
2Reliability
If multiple O-ring seals are used, then leakage prevention is improved, but maintenance complexity and cost increase
Solution Approach 1:
The patent removes unnecessary O-ring seals from the valve assembly by redesigning the sealing architecture. Critical sealing locations are identified and retained, while redundant seals are eliminated. The sealing surfaces are configured to provide adequate sealing with fewer components, reducing maintenance complexity while maintaining reliability.
Solution Approach 2:
The patent designs self-sealing features that reduce dependence on multiple O-ring seals. Sealing surfaces are configured to maintain sealing through their geometric design and material properties, allowing the valve to self-seal without requiring numerous elastomeric seals. This reduces maintenance needs while preserving leakage prevention.
3Ease of operation
If rotational resistance is increased, then control feel is improved, but force required for operation increases affecting accessibility
Solution Approach 1:
The patent applies different rotational resistance characteristics to different portions of the rotation range. The resistance is optimized to provide adequate control feel in the critical rotation zones while minimizing resistance in other portions. This localized optimization maintains accessibility for users with limited strength while preserving satisfactory control feedback.
Solution Approach 2:
The patent optimizes the rotational resistance parameter across the valve operation range. By carefully selecting and varying the resistance characteristics at different rotation positions, the valve provides sufficient tactile feedback for proper operation while keeping the overall force requirement within accessible limits for all users.
4Object-affected harmful factors
If lead is removed from brass housing, then contact with potable water is reduced, but manufacturing cost and complexity increase
Solution Approach 1:
The patent extracts the flow path from contact with the brass housing material by creating a dedicated flow channel. This allows the use of conventional leaded brass housing for its manufacturing advantages while preventing lead contact with potable water through the isolated flow path design.
Solution Approach 2:
The patent introduces a flow channel as an intermediary between the leaded brass housing and potable water. This intermediary structure enables the continued use of cost-effective leaded brass housing while preventing harmful lead-water contact, avoiding the need for expensive lead-free material substitution.
Data Source
AI summary
A valve assembly includes a valve housing having an internal generally cup-shaped bore, a valve control cartridge inserted into the bore and having a rotatable control stem extending upwardly therefrom, and a bonnet nut having a through-bore. The bonnet nut is threaded to the valve housing such that the control stem extends through the through-bore. Flexible fingers are provided along the through-bore to control a level of resistance to a rotation of the rotatable control stem. The stem is positioned to frictionally engage the flexible fingers as the stem is rotated.