Frost-Resistant External Wall Tapping Valve With Threaded Drainage Sleeve
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing external wall nozzles with internal valve seats and downstream backflow preventers face issues with frost damage due to trapped water that cannot drain, leading to potential damage to the valve body and backflow preventer when ambient temperatures drop below zero.
Innovation Solution
An annular surface within the pipe wall reduces the pipe cross-section, allowing a threaded sleeve to move between sealing and draining positions, creating a flow channel for efficient drainage of water between the valve seat and system separator, while maintaining the nozzle's functionality and preventing frost damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a backflow preventer is installed downstream of the valve seat, then backflow protection is improved, but water trapping and frost damage risk worsen
Solution Approach 1:
The drainage function is segmented from the main valve body by introducing a separate drainage channel that leads to an external drainage opening. This allows the backflow preventer to remain in its protective position while providing a dedicated path for water to drain out, preventing trapping and frost damage.
Solution Approach 2:
A drainage channel acts as an intermediary element between the valve body interior and the external environment. This channel mediates the drainage function, allowing water to escape without compromising the backflow protection provided by the downstream backflow preventer.
2Temperature
If the valve body is extended into the exterior wall, then the valve seat is relocated to a frost-free area, but water drainage capability worsens
Solution Approach 1:
The drainage solution is implemented in a different dimensional space by creating a drainage channel that extends radially outward from the valve body to the exterior surface. This allows drainage functionality to be added without extending the valve body further into the wall, maintaining the frost-free valve seat location while enabling effective water drainage.
3Productivity
If a threaded sleeve with internal flow channel is used, then drainage capability is improved, but residual water accumulation worsens
Solution Approach 1:
The flow channel is extracted from the interior of the threaded sleeve and relocated to the exterior surface of the valve body. This external flow channel configuration allows water to drain completely without creating trapped residual water, as the channel opens directly to the external environment rather than being enclosed within the threaded sleeve structure.
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 solution effectively drains water from the valve body, reducing the risk of frost damage and ensuring reliable operation by minimizing residual water accumulation, even in non-horizontal installations.
Implementation Method 1
The threaded sleeve is movable along this annular surface in a lifting movement corresponding to the axial direction of the line section. The lifting movement is brought about by screwing the threaded sleeve into or out of the internal thread.
Implementation Method 2
The first segment of the threaded sleeve is the part of the threaded sleeve that, in conjunction with the annular surface, seals the gap between the annular surface and the first segment when the threaded sleeve is in the first section of the stroke movement.
Implementation Method 3
a flow channel opens between the outer circumference of the valve pin and the inner surface of the threaded sleeve in the area of a constriction, through which the water in the line section can drain
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
The present invention relates to an external wall tap valve (2) with a valve body (4) comprising a pipe (3) with a pipe wall (3a), the outlet of which is closed by a system separator (30). To improve the drainage of a liquid from the pipe section (6), it is proposed to seal the space (28) between the circumferential surface (26) of a first segment (24) of the threaded sleeve (9) and an annular surface (23) formed on the inside of the pipe wall (3a) with a seal (32) when the threaded sleeve (9) is in a first section (I) of a stroke movement (H), and to design the space (29) between the circumferential surface (27) of a second segment (25) of the threaded sleeve (9) and the annular surface (23) as a flow channel (30) when the threaded sleeve (9) is in a second section (II) of a stroke movement (H).