Solid Matter Valve Stem Segmentation for Pressurized Can Sealing
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Solution Overview
Problem
Conventional solid matter valves for pressurized cans, particularly those used for discharging assembly foams, face issues with moisture ingress leading to polymer hardening, impaired sealing, and spring mechanism blockage due to deposit formation, which affects operational reliability and safety.
Innovation Solution
The valve design features a stem divided into two parts connected in a form- and force-closed manner, with an elastic diaphragm linking the upper part to the valve body, and a spring element secured by a retaining clip, ensuring effective sealing and preventing moisture ingress while allowing for easy connection with dispensing aids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional disk valve with coil spring and sealing lips is used, then the valve can discharge foam and seal during operation, but moisture diffuses into the valve mechanism causing prepolymers to harden and the valve to become blocked
Solution Approach 1:
The valve is divided into two separate chambers: a first chamber containing the prepolymers and a second chamber containing the cross-linking component and discharge opening. The stem separates these chambers, preventing moisture from the second chamber from reaching the prepolymers in the first chamber, thus eliminating the harmful effect of moisture-induced hardening while maintaining reliable sealing.
Solution Approach 2:
A hydrophobic membrane is introduced as an intermediary element between the two chambers. This membrane allows selective passage of substances while blocking moisture diffusion, serving as a protective barrier that maintains the integrity of the prepolymers and prevents valve blockage without compromising the sealing function.
2Device complexity
If the stem is made as a single piece, then the construction is simple, but deposits form on the sealing surfaces impairing the sealing function
Solution Approach 1:
The stem is divided into two separate parts: a first stem part in the first chamber and a second stem part in the second chamber. This segmentation creates distinct sealing surfaces for each chamber, preventing deposit accumulation from affecting the entire sealing interface and maintaining reliable sealing function over time, while the overall construction remains relatively simple.
3Device complexity
If the internal pressure of the pressurized can is used to reset the valve, then no additional components are needed, but the pressure is usually not sufficient to cause a complete reset
Solution Approach 1:
The spring element is extracted from the traditional single-chamber configuration and repositioned to act on the second stem part in the second chamber. This extraction allows the spring to provide the additional force needed for complete valve reset, compensating for insufficient internal pressure while maintaining a relatively simple overall mechanism.
Solution Approach 2:
A spring element is introduced as a counterbalancing force to compensate for the insufficient internal pressure. The spring provides the additional force needed to ensure complete reset of the valve mechanism, acting as a mechanical counterweight that makes up for the pressure deficiency without significantly increasing device complexity.
4Adaptability or versatility
If spray guns or other application aids are connected to the valve, then dispensing functionality is enabled, but connection tightness and sealing may be compromised
Solution Approach 1:
A connection element with a sealing bead is introduced as an intermediary component between the valve and spray guns or application aids. The sealing bead creates a reliable sealing interface that maintains connection tightness while enabling versatile dispensing functionality, preventing moisture ingress and maintaining seal integrity during use.
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 design enhances sealing reliability, prevents moisture-induced polymer hardening, and maintains operational safety by ensuring the valve remains functional over time, even under varying humidity conditions.
Implementation Method 1
said upper part being integrally connected to the valve body via a circumferentially extending elastic diaphragm
Implementation Method 2
spring elements are used... said spring element acting on the lower part of the stem
Implementation Method 3
at least one sealing element acting between the valve body and the stem... prevent moisture from entering the valve area
Data Source
AI summary
The invention relates to a solid matter valve for pressurized cans, in particular for the dispensing/discharging of assembly foams, with a valve disk (1), a valve body (2) arranged in the valve disk (1), a stem (3) mounted in a central cuts out (21) of the valve body (2) and having at least one inlet opening (33) for the contents of the pressurized can, said opening being cleared by actuation of the stem (3), with at least one discharge opening, a duct (34) connecting the inlet opening (33) with the discharge opening, at least one sealing element (23) acting between the valve body (2) and the stem (3), as well as a spring element (40), wherein the stem (3) is designed so as to form two parts, the upper part (3a) being connected to the lower part (3b) in a form-closed or force-closed manner, a circumferential elastic diaphragm (22) integrally connecting the valve body (2) to the upper part (3a) of the stem (3), and the two parts (3a, 3b) of the stem (3) forming a functional unit which accommodates the duct (34).