Aseptic Double Seat Valve Modular Cartridge Design
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Solution Overview
Problem
Aseptic double seat valves face challenges in maintenance and servicing due to the diaphragm being a single, non-replaceable part, and lack effective leakage monitoring at the lower closing body, which complicates chemical cleaning and detection of leaks.
Innovation Solution
The diaphragm is fixed with its inner rim on the outer, hollow valve stem and outer rim on the second closing body, allowing for modular preassembled cartridges that simplify maintenance and enable different sealing systems, while leakage monitoring is facilitated without hollowing the inner valve stem, using a modular design with a cup-shaped second closing body and a removable cap for reliable detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the diaphragm is fixed as a single part in the known double seat valve, then the sealing function is achieved, but the ease of repair deteriorates because the valve must be disassembled into many individual parts to replace the diaphragm
Solution Approach 1:
The valve is divided into modular cartridges (first cartridge containing first closing body, second cartridge containing second closing body) that can be independently removed and replaced. The diaphragm becomes part of the second cartridge assembly, allowing the entire cartridge to be replaced as a single unit rather than disassembling multiple individual parts to access and replace just the diaphragm.
2Difficulty of detecting and measuring
If the inner valve stem is hollowed out for leakage monitoring, then the measurement capability is improved, but the strength of the valve stem deteriorates
Solution Approach 1:
The valve stem is divided into an outer valve stem (hollow, providing structural strength) and an inner valve stem (solid, providing sealing function). The hollow outer valve stem contains a leakage monitoring device that can detect leaks without requiring the inner valve stem to be hollowed out, thus maintaining the strength of the valve stem while enabling leakage detection.
Solution Approach 2:
The hollow outer valve stem acts as an intermediary structure that provides both mechanical support and a pathway for leakage monitoring. It mediates between the need for structural integrity and the need for leak detection capability, allowing the solid inner valve stem to maintain full strength while the outer hollow structure enables monitoring.
3Reliability
If the diaphragm is fixed on the inner valve stem at a distance from the closing body, then the sealing function is achieved, but the adaptability deteriorates because functional subassemblies cannot be replaced with structurally different subassemblies
Solution Approach 1:
The valve is segmented into replaceable cartridges that can be independently exchanged. The second cartridge contains the second closing body and diaphragm assembly, allowing this functional subassembly to be replaced with a structurally different cartridge (e.g., using corrugated bellows instead of diaphragm) without affecting other parts of the valve.
Solution Approach 2:
The cartridge design provides a universal interface that can accommodate different sealing systems (diaphragm, bellows, or other sealing mechanisms). This allows the same valve housing and basic structure to support multiple configurations by simply replacing the cartridge, enhancing adaptability while maintaining reliable sealing function.
4Ease of operation
If the second closing body is made cup-shaped with removable cap, then the ease of operation is improved for leakage monitoring, but the device complexity increases
Solution Approach 1:
The second closing body is segmented into a cup-shaped main body and a removable cap. This segmentation allows the cap to be easily removed for leakage monitoring access and then resealed, providing simple operational access without requiring complex disassembly procedures.
Solution Approach 2:
The removable cap design allows for simple, inexpensive access to the leakage monitoring space. Rather than designing a complex permanent access mechanism, a simple removable cap provides adequate functionality for monitoring while keeping the overall structure relatively simple and easy to manufacture.
Data Source
AI summary
An aseptic double seat valve has a housing, which has connections for two pipe conduits. A first valve seat and a second valve seat are arranged spaced apart from one another in the direction of a longitudinal axis in the housing between the connections for the two pipe conduits. A first closing body interacts in a sealing manner with the first valve seat, and a second closing body interacts in a sealing manner with the second valve seat. A first elongate valve stem, which is of hollow design is connected to the first closing body, and a second elongate valve stem, which extends through the interior of the first valve stem, is connected to the second closing body. A diaphragm, which has a radially inner opening, serves to seal off a gap present between the first valve stem and the second valve stem. An outer rim of the diaphragm is fixed in a sealing manner on the second closing body, and the inner rim of the diaphragm is fixed in a sealing manner on the first valve stem.