Pilot Valve Segmentation for Rapid Response
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Solution Overview
Problem
Existing pilot valves have a slow response time, which prolongs the duration of undesirable fluid conditions in a system, necessitating a solution to minimize this response time for effective control valve operation.
Innovation Solution
A 3-way pilot valve design with a housing and piston structure that establishes fluid communication between ports to rapidly open or close a main control valve, utilizing a combination of conduits and sealing members to facilitate quick pressure changes across the diaphragm, allowing for minimized opening and closing times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a conventional pilot valve design is used, then the structure is simple, but the response time is slow
Solution Approach 1:
The pilot valve is divided into multiple functional segments: a first pilot valve portion with a first valve disk for controlling communication between the first port and second port, and a second pilot valve portion with a second valve disk for controlling communication between the first port and third port. This segmentation allows independent control of different fluid pathways, enabling rapid response without requiring complete redesign of the entire valve structure.
Solution Approach 2:
The patent introduces a vertical stacking dimension by placing the first and second pilot valve portions at different vertical levels within the housing. The first pilot valve portion is positioned above the second pilot valve portion, with the piston rod extending vertically to actuate both valve disks. This dimensional arrangement allows multiple control functions to be integrated in a compact space while maintaining fast response characteristics.
2Reliability
If the pilot valve response time is reduced, then system protection is improved, but the valve structure becomes more complex
Solution Approach 1:
The patent merges multiple control functions into a single integrated pilot valve assembly. The housing contains both the first and second pilot valve portions, shared piston mechanism, and multiple ports (first, second, and third ports) all configured to work together. This consolidation achieves rapid system protection response while avoiding the complexity of multiple separate valve assemblies.
Solution Approach 2:
The piston and piston rod serve as an intermediary mechanism that translates single input force into simultaneous control of both valve disks. When pressure differential acts on the piston, it moves the piston rod which in turn actuates both the first and second valve disks, enabling coordinated rapid response across multiple fluid pathways without requiring complex independent control mechanisms.
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 enables rapid response of the pilot valve, minimizing exposure of system components to excessive fluid conditions by achieving quick opening and closing of the main control valve, thus protecting the system from adverse pressures and flow rates.
Implementation Method 1
a piston disposed within the housing to selectively establish fluid communication between the first port of the pilot valve and one of the inlet and the outlet of the main valve
Implementation Method 2
utilizing a combination of conduits and sealing members to facilitate quick pressure changes across the diaphragm
Data Source
AI summary
A valve assembly is disclosed that includes a main valve, a pilot valve, and means providing fluid communication between the main valve and the pilot valve. The main valve includes an inlet, outlet, and means adapted to selectively open and close fluid flow between the inlet and the outlet. The pilot valve includes a housing having a first port, a second port, and a third port, and a piston disposed within the housing. The piston cooperates with the housing and the means providing fluid communication to selectively establish fluid communication between the first port of the pilot valve and one of the inlet and the outlet of the main valve.