Valve Plug Seat Geometry for Low Flow Noise Reduction
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Solution Overview
Problem
Valves operating under low flow conditions experience rapid cyclic opening and closing due to Venturi nozzle flow, leading to noise and potential damage from pressure differentials, which existing designs fail to adequately mitigate.
Innovation Solution
The valve device incorporates a modified geometry between the plug and seat elements, increasing the distance between them to alter the Venturi nozzle flow direction, preventing force imbalances and reducing cyclic operation by managing flow conditions at localized regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the valve operates under low flow conditions with a small gap between plug element and seat element, then the downstream demand can be satisfied, but the Venturi nozzle flow causes pressure drop that leads to rapid cyclic opening and closing of the valve
Solution Approach 1:
The patent applies local quality by modifying the geometry of the gap region between the plug element and seat element. Specifically, the gap is designed with a non-uniform cross-section that changes along the flow direction, creating different flow characteristics in different regions. This localized geometric modification prevents the formation of Venturi nozzle flow in the critical region while still allowing sufficient fluid flow to meet downstream demand, thereby eliminating the pressure drop that causes cyclic valve operation.
2Quantity of substance
If the plug element moves closer to the seat element to reduce flow, then the downstream demand may be met, but the Venturi effect causes localized pressure changes that upset the force balance and cause violent valve closure
Solution Approach 1:
The patent applies parameter changes by modifying the geometric parameters of the gap between the plug element and seat element. The gap is designed with specific dimensional characteristics (non-uniform cross-section, controlled gap width) that change the flow regime from Venturi nozzle flow to a more stable flow pattern. This geometric parameter modification eliminates the localized pressure drop that creates harmful pressure differentials, preventing the force balance upset that leads to violent valve closure while still allowing adequate fluid flow.
3Quantity of substance
If the valve opens slightly to form a small gap for low flow conditions, then downstream demand can be satisfied, but the resulting cyclic operation generates noise and vibrations that can lead to valve failure
Solution Approach 1:
The patent applies local quality by designing the gap region with specific geometric characteristics that differ from a uniform annular gap. The non-uniform cross-section and controlled geometry of the gap create favorable flow conditions that prevent turbulent fluctuations and vortex formation. This localized geometric optimization eliminates the source of noise and vibrations generated by cyclic valve operation, while still maintaining sufficient fluid flow to meet downstream demand.
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 design significantly reduces noise and prevents damage by eliminating pressure drops that cause cyclic valve operation, ensuring stable operation during low flow conditions.
Implementation Method 1
Under certain flow conditions, the gap operates as a nozzle that induces a Venturi nozzle flow. This flow leads to localized changes in the velocity and pressure of the fluid as the fluid exits the nozzle.
Data Source
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AI summary
Embodiments of a valve device that reduces noise and vibration that may occur during low flow conditions in fluid couplings (e.g., valves and flow regulators). These embodiments utilize a plug (108) and seat (106) arrangement with geometry to prevent pressure differentials that cause the plug element to open and close in a cyclic pattern. In one embodiment, the valve device includes a seat element with an aperture (118) and a plug element with a boss (122) that extends into the aperture when the plug element contacts the seat element. The boss has an outer surface that forms a gap (128), which defines an annular area proximate the point of contact between the seat element and the plug element that is sized to reduce Venturi flow effects that cause the cyclic pattern to occur.