Solid Material Valve Stem Sealing for Pressurized Foam Cans
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Solution Overview
Problem
Existing solid material valves for pressurized cans, particularly those used for discharging mounting and sealing foams, face issues with moisture diffusion leading to polymer hardening and impaired functionality, resulting in uncontrolled or leaky discharge due to the presence of spring mechanisms inside the valve mechanism.
Innovation Solution
A valve design featuring a rubber-elastic element surrounding the stem concentrically, with sealing elements between the valve body and stem, and between the valve body and the stem, preventing moisture entry and eliminating the need for a spring mechanism, ensuring reliable sealing and operation even when connected to spray guns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a spring mechanism is used inside the valve to provide restoring force, then the valve can reliably return to closed position, but moisture diffuses into the spring area causing polymer formation that blocks or impairs valve function
Solution Approach 1:
The patent removes the spring mechanism from the interior valve space and relocates it to the exterior of the can. The stem extends through the valve disk to engage the external spring, which provides restoring force without being exposed to moisture inside the can. This extraction eliminates the harmful interaction between moisture and the spring while maintaining the valve's ability to return to closed position.
Solution Approach 2:
The stem acts as an intermediary element that transmits the restoring force from the external spring to the valve closure element. By using the stem as a mediator, the patent allows the spring to remain outside the moisture-prone interior while still providing the necessary mechanical action to close the valve reliably.
2Reliability
If sealing elements are made elastic to enable deformation and sealing, then sealing effectiveness improves, but pressing forces are limited which reduces tightness
Solution Approach 1:
The sealing element is constructed as a composite structure combining an elastic component for deformation and sealing with a rigid component for structural support and force transmission. This composite design allows the sealing portion to deform effectively for sealing while the rigid portion can transmit higher pressing forces to maintain tightness under pressure.
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 valve effectively prevents moisture from entering the valve space, maintaining operational safety and ensuring controlled discharge of foam materials by using the elastic element's restoring force to return the stem to its rest position, thus maintaining valve functionality and preventing polymer hardening.
Implementation Method 1
one elastic element acting on the stem and sealing elements arranged and acting between the valve disk and valve body and between valve body and stem
Data Source
AI summary
Solid material valve for pressurized cans, especially for the discharge of mounting foams, provided with a valve body (2) arranged in a valve disk (1), a stem (3) guided within a central cut-out (21) of the valve body (2), with at least one inlet opening cleared for the passage of the can contents by actuating said stem (3) as well as one central discharge opening, one elastic element (4) acting on the stem (3) and sealing elements (22, 23) arranged and acting between the valve disk (1) and valve body (2) and between valve body (2) and stem (3), the elastic element (4) being provided with at least one formed part made of a rubber-elastic material and surrounding the stem (3) concentrically, with said elastic element (4) resting on the valve body (2) at the can side and on the stem (3) at the valve side.