Multiport Piston Plug Valve for Stop, Metering, and Check Functions
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Solution Overview
Problem
Conventional refrigeration valves are inadequate in stopping all fluid flow for maintenance, accommodating varying flow demands, and are costly due to the need for multiple valves or many moving parts to perform different flow control functions.
Innovation Solution
A multiport valve with a guide seat, a movable piston plug, and an adjustable valve stem that can prevent forward and reverse fluid flow, control flow amounts, and be modular, allowing for different operational states without requiring separate valves, thus reducing the number of moving parts and production costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional refrigeration valves are used, then the system can control fluid flow, but the valves cannot stop all flow for maintenance or accommodate different flow demands, requiring multiple separate valves
Solution Approach 1:
The piston plug valve integrates multiple flow control functions into a single device. The piston plug can be positioned to stop all flow, control flow through metering slots, or prevent reverse flow, replacing what would traditionally require multiple separate valves. This multi-functionality directly addresses the contradiction by providing versatile flow control capabilities while reducing the number of valve components needed in the refrigeration system
2Adaptability or versatility
If conventional refrigeration valves with multiple moving parts are used, then different flow control functions can be performed, but production and operational costs increase
Solution Approach 1:
The invention merges the functions of stop valve, flow control valve, and check valve into a single piston plug valve assembly. By combining these previously separate components into one integrated device with a single piston plug that performs all functions, the design reduces manufacturing complexity and costs while maintaining versatile flow control capabilities
3Reliability
If conventional refrigeration valves are used, then fluid flow can be controlled, but the valves cannot effectively prevent reverse fluid flow
Solution Approach 1:
The piston plug valve incorporates check valve functionality as one of its operational modes. When the piston plug is positioned against the check valve seat, it prevents reverse fluid flow. This integration of reverse flow prevention into the same device that also provides stop and flow control functions maintains reliability while avoiding the need for additional separate check valve components
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 multiport valve efficiently and economically controls fluid flow by acting as a 'three-in-one' valve, sealing off, metering, and preventing reverse flow, reducing operational complexity and costs compared to conventional systems.
Implementation Method 1
When the valve is no longer pressurized and residual fluid pressure remains in the valve, the fluid pressure pushes the piston plug against the guide seat to prevent reverse fluid flow through the valve
Implementation Method 2
When the valve is closed, the piston plug is biased against the guide seat by a spring
Data Source
AI summary
A valve for a refrigeration system includes a valve body, a guide seat arranged in the valve body, a piston plug that has a metering slot and is axially movable relative to the guide seat to open and close the valve, and an adjustable valve stem that is axially movable to engage the piston plug. The piston plug is movable between a closed position in which the piston plug is seated against the guide seat and engaged with the valve stem to prevent fluid flow through the valve, a metering position in which the piston plug is moved away from the guide seat and engaged with the valve stem to enable a predetermined amount of forward fluid flow through the valve, and a check valve position in which the piston plug is seated against the guide seat to prevent reverse fluid flow through the valve.