Needle Valve Flexible Membrane Sealing Two-Component Paint
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Solution Overview
Problem
Conventional needle valves used in coating systems for two-component paints, such as those containing isocyanate and master batch, face issues like premature curing due to moisture, adhesion, and wear from abrasive nanoparticles, leading to valve failure, leakage, and potential overpressure faults that can cause hose bursting.
Innovation Solution
A needle valve design featuring a flexible membrane that surrounds the valve needle to prevent media escape and adhesion, combined with a pneumatic drive and adjustable sealing elements to ensure reliable operation and prevent overpressure faults.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sealing ring is used to seal the valve chamber, then the valve structure is simple and easy to manufacture, but the curing agent can escape through the sealing ring leading to premature curing and valve failure
Solution Approach 1:
The patent replaces the conventional sealing ring with a flexible membrane that surrounds the valve needle. This membrane is made of elastomeric material and is fixed to the valve body, creating a flexible barrier that prevents curing agent escape while accommodating the low viscosity and creep properties of the two-component paint mixture.
Solution Approach 2:
The flexible membrane acts as an intermediary element between the valve needle and the valve body, providing a sealing function that prevents direct contact between the curing agent and the valve drive components, thereby eliminating adhesion and premature curing issues.
2Ease of manufacture
If a sliding sealing ring is used, then the valve structure is simple, but abrasive nanoparticles in the paint cause premature wear of the sealing ring
Solution Approach 1:
The flexible membrane replaces the sliding sealing ring, eliminating the sliding contact that causes wear from abrasive nanoparticles. The membrane's flexible nature allows it to conform to the valve needle without requiring sliding movement, thereby extending service life.
Solution Approach 2:
The patent replaces the mechanical sliding sealing system with a flexible membrane system that prevents sliding contact, thereby eliminating wear caused by abrasive nanoparticles in the two-component paint mixture.
3Device complexity
If conventional sealing is used, then the valve structure is simple, but chemical reactions can occur between the medium and needle tip material leading to adhesion
Solution Approach 1:
The flexible membrane serves as an intermediary barrier between the two-component paint mixture and the valve needle, preventing direct chemical contact that would cause adhesion. This allows the use of standard materials without requiring special chemically resistant coatings or treatments.
Solution Approach 2:
The patent extracts the sealing function from the valve needle itself and places it in a separate flexible membrane, thereby removing the needle tip from direct contact with the chemically reactive two-component paint mixture and preventing adhesion.
4Device complexity
If the valve needle is exposed to the two-component mixture, then the valve structure is simple, but moisture in the mixture causes premature curing
Solution Approach 1:
The flexible membrane creates a barrier that isolates the valve needle and drive mechanism from the two-component paint mixture, preventing moisture from initiating premature curing of the curing agent during valve operation and stoppage periods.
Solution Approach 2:
The patent segments the valve chamber into two distinct zones: a media-containing zone with the two-component paint mixture, and a drive zone containing the valve drive mechanism. The flexible membrane forms the boundary between these zones, preventing contamination and premature curing in the drive zone.
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 flexible membrane and pneumatic drive system effectively prevent curing and adhesion issues, ensuring reliable valve operation and preventing overpressure faults, thus reducing maintenance and operational downtime.
Implementation Method 1
a flexible membrane (18) as a sealing element for sealing the valve chamber (17) with respect to the valve drive (8). The flexible membrane (18) is fixed in a sealing manner to the inside wall of the valve chamber (17)
Implementation Method 2
The needle valve (1) has a pneumatic drive (8) for actuating the valve needle (4)
Data Source
AI summary
The disclosure relates to a needle valve for controlling a fluid flow of a coating agent (H, SL) in a painting system, particularly for controlling a fluid flow of a two-component mixture consisting of two coating agent components (H, SL), particularly a two-component paint made from a master batch (SL) and a curing agent (H), comprising a valve seat (7) and a displaceable valve needle (7) with a needle stem and a valve head (5), wherein the valve head (5) closes the valve seat (7) in a closed position of the valve needle (7), while the valve head (5) opens the valve seat (7) in an opened position of the valve needle (7). The disclosure provides a flexible membrane (18) which surrounds the valve needle (7) annularly and in a sealing manner upstream before the needle head (5).