Locking Sleeve Safety Assembly for Valve Air Couplings
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Solution Overview
Problem
Existing safety devices for valves in plants require structural modifications to the valve or drive, which can be costly and prone to failure due to wear, and do not effectively prevent unintended switching during maintenance.
Innovation Solution
A safety device comprising two movable sleeves that can be locked to cover coupling portions, preventing the release of compressed air and ensuring the valve remains in a secure state, even when the control head is still operational.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If structural modifications are made to the valve or drive to integrate a safety device, then the safety function is built-in, but the cost increases and the complexity of installation increases
Solution Approach 1:
The safety device is segmented into separate modular components: a safety device body, a first coupling portion for the control head, and a second coupling portion for the compressed air line. This allows the safety device to be retrofitted onto existing valves without structural modifications, reducing costs while maintaining reliability
Solution Approach 2:
The safety device acts as an intermediary component inserted between the control head and the compressed air line. It mediates the connection by providing coupling portions that interface with both components, enabling safety functionality without modifying the original valve or control head structure
2Device complexity
If only the compressed air line is immobilized, then the safety device becomes simpler, but the control head can still be operated potentially causing accidental supply
Solution Approach 1:
The safety device merges two protection functions into one device: immobilizing the compressed air line through the second coupling portion and simultaneously blocking the control head through the first coupling portion. This combination provides comprehensive protection while maintaining reasonable device complexity
Solution Approach 2:
The safety device performs preliminary blocking of both the compressed air line and control head connections before any operation can occur. The coupling portions are designed to be secured in place beforehand, preventing both accidental supply and operation in advance
3Ease of manufacture
If the safety device is retrofitted onto existing valves, then costs are reduced, but the device must be easily installable without modifications
Solution Approach 1:
The coupling portions are designed with universal interfaces that can connect to standard control heads and compressed air lines. The grooves and receptacles are designed to accommodate common connection types, enabling easy retrofitting onto existing valves without custom modifications while maintaining cost-effectiveness
Data Source
AI summary
A safety device comprises a main body that extends along a longitudinal axis, a first coupling portion and a second coupling portion, and a first sleeve and a second sleeve. The first and second sleeves are arranged on the main body so as to be movable along the longitudinal axis. The first and second sleeves and the main body are selectively movable into a position in which at least one of the first sleeve or the second sleeve cover the associated first coupling portion and second coupling portion. The covering sleeve can be locked in that position. An arrangement comprising a control head and a drive with the safety device and a method for arranging the drive and the safety device are also described.