Back-Pressure Water Stop Valve for Timely Leak Shutoff
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Solution Overview
Problem
Conventional water inlet valves often fail to stop water flow in a timely manner, leading to water leakage and resource waste, as the back-pressure pad becomes ineffective over time.
Innovation Solution
A water stop valve design featuring a valve body, valve stem, water plugging stopper, and drive mechanism, where the valve stem moves to open and close a back-pressure hole, utilizing a sealing end surface and water-plugging stopper to control water flow, with a compression spring and limiting member to ensure timely stopping of water intake.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional back-pressure pad is used to control water flow, then the valve can stop water flow, but the back-pressure pad becomes ineffective over time leading to water leakage
Solution Approach 1:
The patent extracts the sealing function from the back-pressure pad by introducing a separate water-plugging stopper. The stopper is specifically designed to block the water-plugging hole, while the back-pressure pad maintains its original function of applying pressure. This separation allows the stopper to be replaced or maintained independently, solving the reliability issue when the pad becomes ineffective over time.
Solution Approach 2:
The water-plugging stopper acts as an intermediary component between the back-pressure mechanism and the water flow control. It mediates the action by translating the back-pressure into a physical blocking action at the water-plugging hole, providing a more reliable and maintainable solution than direct pad-to-hole sealing.
2Loss of energy
If the water inlet valve continues to feed water when the drain valve leaks, then water resources are wasted, but the valve lacks a mechanism to detect and respond to leakage
Solution Approach 1:
The patent implements a feedback mechanism where the water level in the water stop tank provides continuous information about the system state. When leakage occurs, the water level changes trigger the float mechanism, which automatically responds by adjusting the valve position to stop water flow, creating a closed-loop control system that prevents water waste.
Solution Approach 2:
The system uses its own water level as a feedback signal to detect leakage conditions and automatically responds without external intervention. The float mechanism self-activates when the water level drops due to leakage, triggering the valve to close and stop further water waste.
3Reliability
If a complex crank arm mechanism is used to control the back-pressure hole, then the valve can stop water flow, but the device complexity increases
Solution Approach 1:
The patent extracts the water flow blocking function from the complex crank arm mechanism and assigns it to a simple water-plugging stopper. The crank arm mechanism is reduced to only its essential function of moving the stopper, significantly simplifying the overall device while maintaining reliable water flow control.
Solution Approach 2:
Instead of using the crank arm mechanism to directly control a pad against a hole, the patent inverts the approach by using a simple stopper that blocks a hole controlled by a simplified crank mechanism. This reversal of the control logic simplifies the mechanical components while achieving the same functional result.
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 water stop valve effectively stops water inlet valves from feeding in water, extending the service life and preventing water leakage, allowing for multiple uses of the water-plugging stopper and reducing water waste.
Implementation Method 1
when the water level of the water stop tank lowers, the float is lowered by the gravity
Implementation Method 2
When the water level of the water stop tank rises, the float is lifted by the buoyancy
Implementation Method 3
water enters the back-pressure cavity through the water-passing gap, and the water-plugging stopper blocks the water-plugging hole under the action of water pressure to stop water
Data Source
AI summary
Disclosed is a water stop valve. A water inlet channel, a water outlet channel, and a water sealing surface are formed in a valve body. A valve stem has a middle portion movably disposed in the valve body and a lower portion mounted in a back-pressure hole of a water-plugging stopper. A back-pressure cavity is formed above the water-plugging stopper. A sealing end surface matching the back-pressure hole is formed on the valve stem. When in use, the valve stem drives the water plugging stopper to move downwards, the sealing end surface blocks the back-pressure hole, and the water plugging stopper blocks the water sealing surface, such that the water enters the back-pressure cavity, and the water pressure enables the water-plugging stopper to block the water sealing surface to stop the water. The water stop valve stops a water inlet valve from feeding in water in a timely manner.