Valve Stem Compression Control for Polyurethane Spray Can Filling
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Solution Overview
Problem
The deformation of valve components during the assembly and filling of polyurethane foam spray cans can lead to valve misalignment, reduced reaction speed, and increased risk of leakage or damage, affecting the efficiency and safety of the filling process.
Innovation Solution
Limiting the compression distance of the valve stem during propellant gas injection to no more than 85% of the compression distance corresponding to a reference point on the force-compression distance curve, as determined by testing, to maintain valve reaction speed and prevent deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the valve stem is compressed further to increase propellant gas injection speed, then the filling productivity is improved, but the valve components deform and reaction speed decreases
Solution Approach 1:
The patent applies parameter changes by optimizing the compression distance parameter to 85% of the reference point. This parameter adjustment increases propellant gas injection speed while preventing valve component deformation, thereby maintaining valve reaction speed and resolving the contradiction between filling productivity and valve reliability.
2Productivity
If the valve stem is compressed further to open the valve more, then the propellant gas injection efficiency is improved, but the valve components are damaged or misaligned
Solution Approach 1:
The patent changes the compression distance parameter to 85% of the reference point, which optimizes valve opening degree for efficient propellant gas injection while preventing excessive compression that would cause valve component damage or misalignment, thus maintaining manufacturing precision.
3Productivity
If the valve stem is compressed beyond the reference point to maximize gas flow, then the filling rate is improved, but the risk of propellant gas leakage increases
Solution Approach 1:
The patent optimizes the compression distance parameter to 85% of the reference point, which maximizes propellant gas flow rate during filling while preventing valve component deformation that would cause sealing failures and leakage, thereby maintaining both filling rate and leakage prevention reliability.
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
This approach reduces the risk of valve damage and misalignment, ensures the valve maintains its reaction speed, and prevents propellant gas or liquid escape during the filling process, enhancing production efficiency and safety.
Implementation Method 1
the valve is opened by compressing the valve stem relative to the valve collar
Implementation Method 2
pressurizing the closed container by injecting at least one propellant gas through the valve stem
Data Source
Figure 1a~1b
Figure 2~3
AI summary
A method is described for the production of a pressure container or spray can containing a composition for forming polyurethane foam, with the following steps: closing the container, after introducing the liquid components, by securing into the opening of the container head a valve (10) having a hollow valve stem (4) centrally arranged in a round valve cup (1) that extends into the valve collar (2), and pressurizing the closed container by injecting at least one propellant gas through the valve stem (4), whereby the valve is opened by compressing the valve stem (4) relative to the valve collar (2), towards the valve cup (1), characterized in that, during the injection, the valve stem (4) is compressed, from its resting position with the valve (10) closed, over a distance of at most 85% of the compression distance corresponding to the reference point (C) on the force-compression distance curve registered on a test bench for a valve (10) of the same embodiment.