Anti-shake Flow-limiting Cutoff Valve with Check Structure
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Solution Overview
Problem
Existing flow-limiting cutoff valves experience shaking issues during closure and difficulty in opening due to reverse fluid flow, leading to incomplete sealing and potential damage from excess water flow in pipelines.
Innovation Solution
An anti-shake flow-limiting cutoff valve with a conical elastic sleeve check valve and a sealing element with minute slots, preventing reverse flow and facilitating complete closure by using a spring-biased piston and guide ring mechanism to ensure stable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a flow stop valve is used to automatically close during excess flow, then water resource waste is prevented, but the piston shakes at the annular valve seat causing incomplete closure
Solution Approach 1:
The patent applies preliminary anti-action by introducing a check valve upstream of the piston that prevents reverse flow before it can reach the piston. This anticipates and blocks the harmful reverse flow that causes piston shaking, allowing the piston to settle completely against the valve seat without disturbance from downstream water hammer effects.
Solution Approach 2:
The check valve serves as an intermediary component between the downstream pipeline and the piston. It mediates the interaction by selectively blocking reverse flow while allowing forward flow, thereby protecting the piston from the destabilizing effects of water hammer and enabling reliable complete closure.
2Reliability
If the piston closes closely against the annular valve seat to stop excess flow, then flow cutoff is achieved, but the piston becomes adsorbed and difficult to open
Solution Approach 1:
The patent extracts the harmful reverse flow from the system by positioning a check valve upstream of the piston. This removes the adsorption-causing reverse flow while maintaining the beneficial forward flow, allowing the piston to close effectively without becoming stuck, and enabling easy reopening when normal flow resumes.
Solution Approach 2:
By placing the check valve upstream, the patent applies preliminary anti-action to prevent reverse flow before it can cause piston adsorption. This proactive measure ensures the piston maintains easy separability from the valve seat while still achieving complete closure for flow cutoff when needed.
3Loss of substance
If manual closure of main switch is used, then excess flow is stopped, but reaction time delay causes great water resource waste
Solution Approach 1:
The flow stop valve operates on self-service principle by automatically detecting excess flow conditions and closing the piston without human intervention. The valve self-regulates based on flow conditions, eliminating the reaction time delay inherent in manual operation and preventing water resource waste during unattended accidents.
Solution Approach 2:
The valve employs feedback through the piston's response to flow conditions - when excess flow creates sufficient force, the piston automatically moves to close the flow path. This feedback mechanism enables real-time automatic response to excess flow conditions, eliminating the time delay of manual detection and action.
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 anti-shake flow-limiting cutoff valve effectively prevents water wastage by ensuring timely and complete closure during excess flow, maintaining normal flow conditions and easy resetting without external force, while preventing piston-shaking and ensuring reliable automatic cutoff.
Implementation Method 1
a biasing component, which applies a biasing force to said piston (3) to move said piston away from said valve seat (6)
Implementation Method 2
a check valve, which is arranged downstream of the liquid outlet through hole of said valve seat (6), for passing the liquid which flows in a direction from the liquid inlet (7) to the liquid outlet (8), and stopping the liquid which flows in a direction from the downstream to the liquid outlet (8)
Implementation Method 3
When a leakage event occurs upstream the device for restricting excess flow, i.e., when an excess flow occurs, the pressure produced by the excess flow exceeds the pressure produced by a fluid of a normal flux. Therefore, the piston will be pushed to move downstream
Data Source
AI summary
The present invention relates to an anti-shake flow-limiting cutoff valve, comprising a flow stop valve, a cutoff valve and a check structure. Said flow stop valve comprises a valve body, a valve seat, a piston and a biasing component. The check structure is arranged downstream said flow stop valve to prevent fluid from flowing back. In case of a sudden excessive water flow, the flow stop valve is closed under impact of excessive water pressure to block the water flow. At this time, since the liquid flow in the pipeline is suddenly blocked, the liquid flow remaining in a pipeline downstream the flow stop valve tends to form a reverse flow to impact the flow stop valve, thus shaking the flow stop valve, which may further lead to insufficient close or damage of the flow stop valve.