Valve Positioner Connection Bar Thread Sealing
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Solution Overview
Problem
Existing valve positioners face challenges with thread sealing issues due to over-tightening or poor lubrication, especially when connecting stainless steel components, and require complex housing adaptations for different thread types and pneumatic component configurations, making filter assembly and maintenance difficult.
Innovation Solution
A valve positioner design featuring a connection bar with interchangeable threads (NPT, BSPT, BSPP) that can be bolted to the housing, allowing for filter placement between the connection bar and housing, and a pneumatic adapter member with straight pressure channels for improved sealing and efficiency, along with a protected electronic circuit board for safe power supply connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If NPT threads are used for pressure connections, then sealing capability is improved, but risk of thread damage increases due to over-tightening or poor lubrication
Solution Approach 1:
The patent introduces a connection bar as an intermediary component between the housing and pressure lines. This connection bar incorporates a sealed pressure connection interface that mediates the connection, eliminating direct threading between stainless steel components and thereby preventing gauling and thread damage while maintaining sealing capability.
Solution Approach 2:
The patent extracts the threading function from the housing structure and relocates it to interchangeable adapters. This separation allows the housing to maintain smooth bore surfaces for pressure connections, while the adapters provide the threading interface, thereby eliminating thread damage risks in the main pressure pathway.
2Adaptability or versatility
If different thread types are integrated into the housing wall, then adaptability to different regions and applications is improved, but device complexity increases
Solution Approach 1:
The patent creates a universal housing design with standardized pressure connection interfaces, and provides multiple interchangeable adapters (NPT, BSPP, etc.) that can be attached to the same housing. This allows a single housing design to serve multiple regional and application requirements without increasing housing complexity.
Solution Approach 2:
The patent segments the threading function into separate, interchangeable adapter components rather than integrating different thread types directly into the housing wall. This modular approach maintains housing simplicity while providing adaptability through detachable adapters.
3Reliability
If filter means are placed at the end of pressure supply lines, then pneumatic components are protected, but assembly and maintenance difficulty increases
Solution Approach 1:
The patent segments the filter assembly from the main housing by placing it on the detachable connection bar. This allows the filter to be easily accessed and maintained by simply removing the connection bar, eliminating the need to disassemble the entire housing or locate the filter at the end of internal pressure lines.
Solution Approach 2:
The connection bar serves as an intermediary carrier for the filter assembly. By placing the filter on this detachable intermediate component rather than integrating it into the housing, the patent enables easy filter maintenance while continuing to protect pneumatic components through the filter's presence.
Data Source
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AI summary
The invention relates to a valve positioner (10) for process control valves having a housing (100), pneumatic components within the housing, a pressure supply input channel (147) and at least one pressure outlet channel (146; 148), wherein internal threads are provided at the pressure supply input channel (147) and at the at least one pressure outlet channel (146; 148), wherein the valve positioner (10) further comprises a connection bar (110) comprising the internal threads.