Pneumatic Safety Valve Locking With Integrated Air Venting
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Solution Overview
Problem
Existing air-operated valves used in hazardous environments face challenges in preventing inadvertent changes in valve status due to mechanical vibration or unauthorized manipulation, especially when dealing with toxic or inflammable substances, as current locking mechanisms do not adequately ensure the valve remains in a desired state.
Innovation Solution
A mechanism that allows for simultaneous mechanical locking/unlocking and venting/blocking of compressed air to control the valve's state, utilizing a control shaft, threaded stopper, and resilient means to ensure the valve remains closed or open based on manual manipulation, preventing unintended changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If padlocks or external locking mechanisms are used to lock the valve handle, then the valve is protected against tampering and unauthorized manipulation, but the locking mechanism does not prevent malfunction due to trapped air or incomplete air venting, and the valve requires separate unlocking for servicing
Solution Approach 1:
The patent combines the locking mechanism with the air venting mechanism into a single integrated system. The locking pin and air vent channel share the same structural space, allowing the locking action to simultaneously seal the air vent channel. This merging eliminates the need for separate locking and venting operations, resolving the contradiction between reliability and device complexity.
Solution Approach 2:
The valve mechanism automatically vents trapped air when the locking pin is engaged, without requiring separate manual intervention. The mechanical action of inserting the locking pin simultaneously closes the air vent channel, allowing the system to self-regulate air pressure and prevent malfunction. This self-service capability enhances reliability while avoiding additional complex control systems.
2Reliability
If the valve is locked in the closed position, then inadvertent opening is prevented, but the valve cannot be serviced or manually manipulated without unlocking
Solution Approach 1:
The valve is pre-configured with an air vent channel that can be sealed by the locking pin. Before locking, any trapped air can be vented through this channel. The locking action itself completes the sealing, ensuring the valve remains securely closed without trapping air. This preliminary preparation of the venting path enables both secure locking and future servicing capability.
Solution Approach 2:
The air vent channel acts as an intermediary mechanism between the locking pin and the valve closure. It provides a controlled path for air evacuation that is activated by the locking action itself, mediating between the mechanical locking function and the pneumatic sealing function. This intermediary structure allows the valve to be securely locked while maintaining the ability to service by simply removing the locking pin.
3Reliability
If compressed air is continuously supplied to keep the valve open, then the valve remains in the desired open state, but trapped air can cause inadvertent opening when the valve is intended to be closed
Solution Approach 1:
The patent extracts the air venting function from the main valve body and integrates it into the locking mechanism structure. The air vent channel is specifically designed to allow trapped air to escape during the locking operation. By taking out the venting function and combining it with the locking pin, the system eliminates the harmful effect of trapped air while maintaining reliable valve state control.
Solution Approach 2:
The locking pin insertion action, which is primarily intended to mechanically secure the valve, is designed to simultaneously serve as the air venting mechanism. The mechanical force of inserting the locking pin forces the air vent channel to open, converting the potentially harmful trapped air pressure into a beneficial venting action. This converts the harmful effect into a useful function that enhances reliability.
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 effectively prevents inadvertent opening or closing of valves, ensuring they remain in their intended state by aligning ducts to control air flow and using a spring mechanism to maintain the valve's position, enhancing safety in hazardous environments.
Implementation Method 1
resilient means for urging the disable mechanism against the control shaft
Implementation Method 2
flow of pressurized air through the internal safety mechanism is allowed, the pressurized air after passing therethrough, acting against the pressing of the diaphragm onto the seat
Data Source
AI summary
A normally closed valve comprising: a seat that has a fluid inlet and a fluid outlet; a diaphragm, an external handle and an internal safety mechanism operationally coupled to the external handle and the diaphragm. The valve allows forcing the handle in a first direction, thereby moving the internal safety mechanism through at least a first and subsequently a second stage. During the first stage: the diaphragm is pressed onto the seat, flow of pressurized air through the internal safety mechanism is blocked, and air pent in the valve is vented, causing the valve to be and remain in a closed state. During the second stage: flow of pressurized air through the internal safety mechanism is allowed, the pressurized air after passing therethrough, acting against the pressing of the diaphragm onto the seat, and a venting of air is reduced, causing the valve to be and remain in an open state.