Hydrant Hose Coupling Ventilation Valve for Complete Drainage
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Solution Overview
Problem
Existing hose couplings for hydrants fail to completely drain residual water, leading to potential freezing and corrosion due to unfavorable negative pressure buildup caused by blocked air supply and lack of pressure equalization.
Innovation Solution
A hose coupling with a ventilation device featuring a non-return valve that equalizes internal hydrant pressure with external atmosphere by opening a flow path when closed and blocking it when the pressure difference exceeds a threshold, incorporating a bushing, valve body, and spring-elastic return element to ensure reliable drainage and ventilation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a backflow preventer is installed in the hose coupling to prevent water from being forced back into the hydrant, then water protection is improved, but air supply to the interior of the hydrant is blocked causing unfavorable negative pressure buildup
Solution Approach 1:
A non-return valve is introduced as an intermediary component between the hose coupling and the backflow preventer. This non-return valve acts as a mediator that allows air to pass through during drainage operations while preventing water from entering the hydrant interior, thus resolving the contradiction between water protection and air supply.
2Object-affected harmful factors
If the backflow preventer remains closed to prevent water ingress, then water protection is improved, but pressure equalization between interior and exterior of the hydrant is prevented
Solution Approach 1:
The non-return valve is designed as a dynamic component that automatically changes its state based on pressure differential. During drainage when external pressure exceeds internal pressure, the valve opens to allow air passage. During normal operation when internal pressure exceeds external pressure, the valve closes to prevent water ingress, thus dynamically resolving the contradiction between water protection and pressure equalization.
3Loss of substance
If drainage is performed through the fluid line to the outside, then residual water removal is improved, but complete drainage is prevented due to negative pressure buildup
Solution Approach 1:
The non-return valve serves as an intermediary that enables air to enter the hydrant interior during drainage operations, equalizing pressure and allowing complete drainage through the fluid line. This resolves the contradiction between residual water removal and drainage efficiency by facilitating the pressure equalization needed for complete drainage.
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
Prevents freezing and corrosion by maintaining pressure equilibrium, ensuring complete drainage and preventing water ingress or egress, thus protecting the hydrant from damage.
Implementation Method 1
The ventilation device opens a flow path between the outside atmosphere and the interior of the hydrant in a first operating state in which the hydrant is closed. Thus, pressure equalization is possible
Implementation Method 2
In this state, the difference between the pressure in the interior of the hydrant and the outside atmosphere exceeds a predetermined threshold value, causing the ventilation device to block the flow path
Implementation Method 3
incorporating a bushing, valve body, and spring-elastic return element to ensure reliable drainage and ventilation
Data Source
AI summary
A hose coupling for a hydrant has a ventilation device. The ventilation device has a non-return valve that is received in a receptacle incorporated into an outer flange of the hose coupling.