Shower Diverter Valve Stem With Reduced Cross Section
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Solution Overview
Problem
Current diverter valves used in shower mixers require significant force to actuate, making them difficult for arthritic or disabled individuals to operate and non-compliant with accessibility regulations.
Innovation Solution
A diverter valve design featuring a stem with a reduced cross-sectional area, tapering radially inwardly from the upstream to the downstream portion, which reduces the activation force needed to move the stem from the non-diverted to the diverted position, assisted by a biasing spring and stop member for reliable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a traditional diverter valve stem with uniform cross-sectional area is used, then the structural strength is maintained, but the activation force required to move the stem becomes excessively high
Solution Approach 1:
The stem is designed with a reduced cross-sectional area at its midpoint, creating a localized weak point that requires less force to deflect. This local modification allows the stem to be more easily actuated while the rest of the stem structure maintains sufficient strength for structural support and sealing functions.
Solution Approach 2:
The stem's cross-sectional area parameter is changed along its length, transitioning from a uniform cylinder to a tapered or hourglass shape. This parameter variation reduces the moment of inertia and bending stiffness at the midpoint, thereby reducing the activation force needed while maintaining overall structural integrity through the larger end sections.
2Ease of operation
If the stem cross-sectional area is reduced to lower activation force, then ease of operation improves, but the structural strength and sealing capability may be compromised
Solution Approach 1:
The sealing surfaces and critical structural regions of the stem maintain their full cross-sectional area and strength characteristics, while only the midsection is reduced. This localized geometry modification ensures that sealing reliability is preserved at the interfaces with the valve body and outlets, while the reduced midsection provides the necessary mechanical advantage for easy actuation.
Solution Approach 2:
The stem features a smoothly curved or tapered transition in its cross-sectional area rather than abrupt changes. This curved geometry distributes stress more evenly, preventing stress concentration that could compromise sealing surfaces, while still achieving the reduced activation force through the gradual geometric transition.
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 reduces the activation force required to divert fluid flow, enhancing usability and compliance with accessibility regulations while maintaining a well-constructed device feel.
Implementation Method 1
The stem includes a downstream portion that has a reduced cross sectional area relative to an upstream portion of the stem. The stem is configured and positioned such that the reduced cross sectional area helps reduce the activation force needed to move the stem from the first position to the second position.
Data Source
AI summary
A diverter valve is disclosed for use in a shower mixer valve or the like. It is constructed to reduce the force needed to be applied by the bather to actuate the diversion. There is a diverter stem that is moveable between a non-diverted and diverted position. The diverter stem includes an upstream portion and a reduced cross sectional waist portion downstream of the upstream portion. The reduced portion interacts with the diverted fluid to reduce the force required to move the diverter stem from the non-diverted to the diverted position.