Needle Valve Seat Assembly with Oscillating Self-Centering
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Solution Overview
Problem
The precise positioning and fixation of valve seats relative to valve needles in needle valves, especially with smaller diameters, pose challenges for achieving a good sealing effect during assembly.
Innovation Solution
A method involving an oscillating movement of the valve needle during fixation, where the valve seat plate is initially fastened with limited mobility to the housing, allowing self-centering of the valve seat as the needle moves back and forth, and subsequently fixed in place, utilizing screws and materials like hard metal and stainless steel for precise alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the valve seat plate is fixed rigidly to the housing during assembly, then the assembly process is simple and fast, but the valve seat cannot self-center relative to the valve needle, resulting in poor sealing precision
Solution Approach 1:
The valve seat plate is designed with temporary mobility during assembly, allowing it to move dynamically in response to the oscillating valve needle. This dynamic positioning enables the valve seat to self-center automatically during the oscillation process, achieving high positioning precision without complex rigid fixation mechanisms.
Solution Approach 2:
The valve needle is subjected to oscillating movement during assembly, which transmits vibrational motion to the valve seat plate. This mechanical vibration facilitates the self-centering process by allowing the valve seat to adjust its position relative to the valve needle, ultimately achieving precise alignment and sealing contact.
2Manufacturing precision
If the valve needle diameter is reduced for better precision application, then the sealing precision can be improved, but the positioning and fixation of the corresponding valve seat becomes more difficult
Solution Approach 1:
The assembly method enables the valve seat to self-center automatically through the oscillating movement of the valve needle. This self-service mechanism eliminates the need for complex external positioning tools or manual adjustment procedures, making the assembly process equally easy regardless of the valve needle diameter.
Solution Approach 2:
The valve seat plate is preliminarily positioned with limited mobility before the oscillation process begins. This preliminary positioning ensures that the valve seat is close to its final position, and the subsequent oscillation only requires minor adjustments to achieve precise self-centering, simplifying the overall manufacturing process.
3Productivity
If the valve seat plate is fully fixed during assembly, then the assembly time is reduced, but the valve seat cannot adjust its position to achieve proper alignment with the valve needle
Solution Approach 1:
The valve seat plate transitions from a static fully-fixed state to a dynamically adjustable state during assembly. The temporary mobility allows the plate to respond to oscillating forces and self-center automatically, achieving both high alignment precision and efficient assembly without requiring multiple fixation and adjustment cycles.
Solution Approach 2:
The oscillating movement of the valve needle applies periodic forces to the valve seat plate during assembly. This periodic action facilitates the self-centering process by continuously adjusting the valve seat position, ensuring precise alignment is achieved rapidly without manual intervention or multiple assembly steps.
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 method enables precise positioning and fixation of valve seats, ensuring a reliable sealing effect by allowing the valve seat to center itself relative to the valve needle, enhancing the assembly precision and effectiveness of needle valves.
Implementation Method 1
self-centering of a valve seat with reference to the valve needle assigned to it can take place if the valve needle performs an oscillating movement during fixation onto the housing
Data Source
AI summary
In a method for assembling a needle valve having a housing, at least one valve needle longitudinally displaceably guided in the housing in a first spatial direction, and at least one valve seat plate, the plate for each needle has a valve seat associated with the needle, at which seat an outlet opening for a fluid can be closed and opened by back and forth movement of the relevant needle. In a first step the plate is fastened to the housing by a fastener such that it has limited movement with respect to the housing. In a second step each needle is set into a back and forth movement in which it is alternatingly placed onto and lifted up from the associated seat. In a third step the plate is fixed on the housing while the at least one needle moves back and forth.