Pilot Relief Valve Pressure Reduction Assembly for Transient Spike Damping
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Solution Overview
Problem
Conventional pilot-operated pressure relief valves often fail to remain closed during transient pressure fluctuations, leading to unnecessary venting and excessive wear due to undesired opening and rapid cycling of the main valve.
Innovation Solution
A pressure reduction assembly is positioned between the pilot valve and the sensing location, incorporating a spool with diverging flow paths to generate turbulence, reducing the magnitude of transient pressure spikes and ensuring reliable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional pilot-operated pressure relief valve is used, then pressure relief function is provided, but the valve fails to remain closed during transient pressure fluctuations causing unnecessary venting and excessive wear
Solution Approach 1:
A pressure reduction assembly is introduced as an intermediary component between the sensing location and the pilot valve. This assembly includes a flow path with intentional restrictions that reduce the magnitude of transient pressure spikes before they reach the pilot valve, preventing false triggering while allowing sustained pressure increases to be properly sensed and responded to.
Solution Approach 2:
The pressure reduction assembly changes the pressure parameter characteristics by attenuating transient spikes. The flow path restrictions create a damping effect that modifies the pressure signal transmitted to the pilot valve, filtering out high-frequency transient variations while preserving the ability to detect genuine overpressure conditions.
2Speed
If the pilot valve is made highly responsive to pressure changes, then pressure relief is achieved, but the valve opens during transient pressure fluctuations
Solution Approach 1:
The pressure reduction assembly serves as a mediator that decouples the direct connection between the sensing location and pilot valve. It allows the pilot valve to remain highly responsive to genuine pressure changes while filtering out transient spikes through its flow path restrictions, effectively separating the response speed function from the false triggering vulnerability.
3Productivity
If the main valve cycles rapidly to respond to pressure changes, then pressure control is maintained, but excessive wear occurs on valve components
Solution Approach 1:
By changing the pressure parameter transmission characteristics through the pressure reduction assembly, transient pressure spikes are attenuated before reaching the pilot valve. This prevents unnecessary pilot valve actuation and subsequent main valve cycling, thereby extending component service life while maintaining responsiveness to sustained pressure increases.
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 assembly effectively dampens pressure fluctuations, preventing unnecessary venting and reducing wear on the main valve by maintaining the pilot valve's responsiveness to sustained pressure changes while mitigating transient spikes.
Implementation Method 1
a second flow path that diverges from the first flow path at a first end of the second flow path, and that directs fluid from the second flow path into the first flow path at a second end of the second flow path in a flow direction opposed to fluid flow in the first flow path, to generate turbulence within the first flow path
Data Source
AI summary
A pressure relief system can include a main valve, a pilot valve in communication with a sensing location that corresponds to a pressure of the main valve and controls operation of the main valve based on pressure at the sensing location, and a pressure reduction assembly arranged between the pilot valve and the sensing location including a reduction-assembly inlet that receives flow from the sensing location, an outlet that provides flow to the pilot valve, a first flow path extending between the inlet and the outlet, and a second flow path that diverges from the first flow path at a first end of the second flow path and directs fluid from the second flow path into the first flow path at a second end of the second flow path in a direction opposed to fluid flow in the first flow path.