Actuator Check Valve Structure for Back Pressure Leak Prevention
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Solution Overview
Problem
In systems where actuators are connected to pressurized canisters, back pressure from secondary pressurized sources can cause operational issues such as disconnection and refrigerant leakage, especially in applications like vehicle air conditioning systems.
Innovation Solution
Incorporating a check valve with a shaped component and a fitted socket within the actuator design to restrict back pressure flow from the output to the input, allowing fluid flow from input to output while preventing back pressure from reaching the canister, using a resilient component like a spring to maintain the seal under neutral pressure conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a standard actuator design is used without a back pressure valve, then the device complexity is low, but back pressure from secondary pressurized sources causes actuator disconnection and refrigerant leakage
Solution Approach 1:
A check valve is introduced as an intermediary component between the actuator and the canister. This check valve includes a valve stem with a ball check valve mechanism that allows refrigerant to flow from the canister to the actuator but prevents back pressure from the secondary pressurized source from reaching the actuator, thereby protecting the connection stability without requiring fundamental changes to the actuator structure
Solution Approach 2:
The valve stem is segmented into functional zones: an upper portion that threads into the actuator, a lower portion that forms a seat for the ball check valve, and intermediate features including a relief aperture and O-ring groove. This segmentation allows each portion to perform its specific function while maintaining overall connection integrity under back pressure conditions
2Reliability
If a check valve is incorporated into the actuator design to restrict back pressure, then connection stability and leak prevention are improved, but the device complexity increases
Solution Approach 1:
The ball check valve mechanism is designed to automatically respond to pressure differential without external control. When back pressure exceeds the refrigerant pressure, the ball is forced against the valve seat by the pressure differential, automatically closing the flow path and preventing leaks. The spring provides continuous biasing force to ensure the valve remains closed until refrigerant pressure overcomes it during normal operation
Solution Approach 2:
The check valve utilizes pneumatic pressure differential to control the valve state. The relief aperture allows pressure equalization in one direction while the ball and spring mechanism responds to pressure differential in the opposite direction, creating a pressure-sensitive valve that automatically opens or closes based on the relative pressures of refrigerant supply and back pressure from the secondary source
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
The solution effectively prevents back pressure from causing actuator disconnection and refrigerant leakage, ensuring reliable operation by maintaining a sealed connection and allowing pressurized gas or fluid to flow only in the intended direction, enhancing the reliability and efficiency of pressurized systems.
Implementation Method 1
a resilient component—e.g. a spring—placed within the interior channel between the fitted socket and the output channel to bias the shaped component toward engagement with the fitted socket
Implementation Method 2
a check valve (or one-way valve) within the design of the actuator which allows fluid flow from the input to the output of the actuator and restricts flow from the output to the input of the actuator
Data Source
AI summary
An actuator device for a pressurized container incorporating an internal back flow prevention valve. The actuator may include a ball and socket check valve with a resilient component to maintain the ball in a condition to operate as a check valve even when upside-down.