Removable Cartridge System Separator Assembly
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Solution Overview
Problem
Existing system separators for liquid systems, such as drinking water and heating systems, face challenges in maintaining a simple structure for easy maintenance and replacement, leading to complex and costly designs with significant pressure losses and positioning issues during assembly.
Innovation Solution
A continuously tubular housing with a coaxially guided, spring-loaded piston drain valve in the cartridge allows for the removal of essential components transverse to the flow direction, minimizing pressure loss and enabling economical production, with a cover that can be completely or articulatedly removed for easy servicing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a piston drain valve with central passage and annular valve seat is used in a fitting housing, then the drain valve can control pressure difference between upstream and downstream systems, but the structure becomes complex and difficult to service
Solution Approach 1:
The system separator is divided into a housing and a removable cartridge assembly. The cartridge contains the upstream non-return valve, downstream non-return valve, and drain valve components, allowing these to be serviced as a unit without replacing the entire housing. This segmentation reduces servicing complexity while maintaining the reliable pressure control function of the piston drain valve.
Solution Approach 2:
The cartridge assembly containing the drain valve and non-return valves is extracted as a removable unit from the housing. This allows the complex valve components to be easily removed for servicing or replacement without disturbing the housing structure, thereby reducing the operational complexity of maintenance while preserving the intricate pressure control mechanisms within the cartridge.
2Ease of manufacture
If the cartridge is made of plastic or non-pressure-resistant material, then production costs are reduced, but the housing must bear all pressure loads
Solution Approach 1:
The housing is designed with locally reinforced sections at the inlet and outlet ends where pressure connections are made, while the central section accommodating the cartridge can be simpler. This allows the housing to bear necessary pressure loads at critical points while reducing overall material costs and manufacturing complexity in non-critical areas.
3Ease of repair
If the housing opening width is limited, then the cartridge can be radially removable for easy maintenance, but the housing structure becomes more complex
Solution Approach 1:
The housing opening is designed asymmetrically - narrow in the radial direction to allow cartridge removal, but extended in the axial direction to maintain structural integrity and pressure containment. This asymmetric geometry enables easy cartridge access for maintenance while avoiding excessive housing complexity.
4Ease of operation
If the drain valve piston is spring-loaded and coaxially guided, then the valve responds automatically to pressure differences, but positioning and assembly become more difficult
Solution Approach 1:
The piston, spring, and sealing elements are pre-assembled into the cartridge as a complete drain valve unit before installation into the housing. This preliminary assembly ensures precise positioning and proper spring tensioning is achieved during manufacturing rather than during field installation, reducing assembly difficulty while maintaining automatic pressure response functionality.
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 simplifies the housing shape, reduces production costs, and minimizes pressure losses while allowing for easy maintenance and replacement of components without removing the entire fitting, maintaining effective separation between liquid systems.
Implementation Method 1
the pressure difference between the inlet pressure in the upstream liquid system and a medium pressure that is established in a medium-pressure space between the piston and the downstream non-return valve acts on the piston against a spring acting in the opening direction
Implementation Method 2
acts on the piston against a spring acting in the opening direction
Implementation Method 3
an upstream non-return valve; a downstream non-return valve, wherein a medium-pressure medium-pressure space is formed between the upstream and downstream non-return valves
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A system separator arrangement (10) for physically separating an upstream liquid system with inlet pressure from a downstream liquid system with outlet pressure by means of a drain valve (58), comprising a substantially tubular housing (12) with an inlet and an outlet; an upstream non-return valve (72) arranged coaxially in the housing (12); a downstream non-return valve (80) arranged coaxially in the housing (12), wherein a medium-pressure chamber (88) with medium pressure is formed between the upstream and downstream non-return valves; a housing opening (58) through which a connection of the medium-pressure chamber (88) to the outside can be established;A drain valve arranged in the flow direction between the upstream non-return valve (72) and the downstream non-return valve (80) for draining liquid, in the form of a slidably, coaxially guided and spring-loaded piston (56) in the housing (12), which, depending on the pressure conditions, closes the housing opening (58) in a flow position, in which water flows from the inlet to the outlet, and opens the housing opening (58) in a separation position to separate the upstream from the downstream liquid system; characterized in that the upstream and downstream non-return valves (72, 80) and the piston (56) are arranged together in a cartridge (40); and the housing (12) has a further housing opening which extends over the entire length of the cartridge (40) and has a width at which the cartridge (40) can be removed from the housing (12) in a radial direction.