Servovalve Filter Retaining Plug With Slotted Tool Access
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Solution Overview
Problem
Servovalves in aircraft control systems face difficulties in removing and replacing filter screens due to press-fitted plugs, which can cause damage to the servovalve body, necessitating costly repairs.
Innovation Solution
A plug design with an annular body and recesses for tool access, combined with a removal tool featuring a rod with teeth and a nut system, allows for the easy and damage-free extraction of the plug from the fluid port, facilitating filter screen maintenance without damaging the servovalve.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a press-fitted plug is used to retain the filter screen, then the filter screen is securely retained in the port, but the plug becomes difficult to remove and may cause damage to the servovalve body
Solution Approach 1:
The plug is segmented with recesses that allow a removal tool to engage and apply force at multiple points around the circumference, enabling controlled extraction without damaging the servovalve body
Solution Approach 2:
A removal tool acts as an intermediary between the operator and the plug, providing controlled force application through slots and recesses to extract the plug without direct contact that could damage the servovalve body
2Strength
If the plug is interference fitted in the port to retain the filter screen, then the filter screen is securely held, but removal requires significant force that may damage the servovalve
Solution Approach 1:
The plug includes pre-formed slots and recesses that prepare the structure for controlled removal, allowing the removal tool to engage and distribute extraction forces evenly to prevent damage to the servovalve body
Solution Approach 2:
The removal process transitions from a static interference fit to a dynamic controlled extraction, where the removal tool applies gradual force through the slots and recesses to minimize impact on the servovalve body
3Ease of operation
If traditional removal methods are used, then the plug can be removed, but the servovalve body may be damaged requiring repair
Solution Approach 1:
The removal tool serves as an intermediary device that mediates between the operator and the plug, providing controlled force application through specifically designed slots and recesses to extract the plug without transmitting damaging forces to the servovalve body, thereby eliminating the need for repair
Data Source
AI summary
A plug for retaining a filter screen in a fluid port of a servovalve, the plug comprises an annular body. The annular body comprises opposed first and second axial annular end surfaces. A radially inner surface extends between the first and second axial annular end surfaces and a radially outer surface extends between the first and second axial annular end surfaces. At least one recess is formed in the radially inner surface for receiving a tool for removing the plug from the port. A plurality of slots is formed in the first axial annular end surface and extends into the at least one recess for providing access for the tool to the at least one recess.