Double-Hose Diaphragm Pump Valve Pivoting Mechanism
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Solution Overview
Problem
Maintenance of delivery valves in high-pressure double hose-diaphragm process pumps is labor-intensive due to the need to loosen multiple screws, and existing solutions like angle valves wear out quickly from flow deflection, complicating valve inspection and replacement.
Innovation Solution
A pivoting device with a hydraulic clamping mechanism allows delivery valves to be pivoted out of the cassette for maintenance, with a hydraulic cylinder and springs enabling axial pretensioning and easy removal, facilitated by a hand pump for cost-effective operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If delivery valves are arranged in a cassette with multiple screws for securing, then the sealing pressure and reliability are improved, but the maintenance time and labor effort increase significantly
Solution Approach 1:
The delivery valve assembly is segmented from the cassette body, allowing the valve to be removed independently without loosening all securing screws. The valve can be extracted through a dedicated opening in the cassette, dividing the maintenance operation from the full assembly disassembly.
Solution Approach 2:
The delivery valve is extracted as a separate component from the cassette assembly. A specific opening is provided in the cassette that allows the valve to be removed without removing the entire cassette or loosening multiple securing screws, enabling quick maintenance while maintaining the sealed connection of the cassette to the pump housing.
2Ease of operation
If angle valves are used to provide free accessibility, then the ease of operation is improved, but the wear resistance deteriorates due to flow deflection
Solution Approach 1:
The cassette is designed with an asymmetric opening positioned for optimal accessibility from above, while the internal flow path maintains symmetric axial alignment. This allows the valve to be accessed easily from the top without requiring the flow to be deflected at an angle, eliminating the wear problem while maintaining operational ease.
Solution Approach 2:
The maintenance access is provided through a vertical opening from the top of the cassette, changing the access dimension from lateral (as with angle valves) to vertical. This allows operators to service the valve from above without creating flow deflection, while the valve itself remains axially aligned with the flow path to minimize wear.
3Reliability
If multiple screws are used to secure delivery valves, then the sealing pressure is improved, but the device complexity and number of components increase
Solution Approach 1:
The delivery valve is extracted as a separate component that can be removed through an opening in the cassette without removing the securing screws. This allows the valve maintenance operation to bypass the screws entirely, maintaining the sealed connection of the cassette to the pump housing while enabling quick valve replacement.
Solution Approach 2:
The cassette is pre-designed with a specific opening and extraction path for the delivery valve, prepared during manufacturing. This preliminary configuration allows the valve to be removed and installed without requiring the operation of multiple securing screws during maintenance, reducing the complexity of the maintenance procedure while preserving the sealed connection.
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 solution significantly reduces maintenance time and effort by allowing defined sealing pressure and easy access for valve inspection or replacement, while minimizing wear on components.
Implementation Method 1
a hydraulic cylinder of the clamping device below or above the delivery valve or valves with a K piston is arranged, which can be subjected to pressure via a hydraulic connection
Implementation Method 2
a hydraulic cylinder of the clamping device below or above the delivery valve or valves with a K piston is arranged, which can be subjected to pressure via a hydraulic connection
Implementation Method 3
a relaxation device is provided to generate a releasing force counteracting the force of the compression spring
Data Source
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AI summary
The invention relates to a double hose-diaphragm process pump comprising feed valves disposed in cassettes. In order to simplify and speed up the dismantling of the feed valves in double hose-diaphragm process pumps, according to the invention a pivoting device is provided, to which the feed valves are each connected and about which the feed valves are pivotable in a hinge-like manner out of an operating position, in which said valves are axially centred in the cassette, into a maintenance position, in which said valves are pivoted out of the cassette. A hydraulically activated tensioning device is provided for pretensioning the feed valve(s) in the operating position to the necessary sealing pressure. In the maintenance position for example a valve inspection or a replacement of parts of the feed valves or the entire feed valves can take place. The tensioning device enables the feed valves to be pretensioned in an axially defined manner in the operating position so that the necessary sealing pressure is attained. Then the respective feed valve is fixed in said position, for example by means of adjusting screws.