High-Pressure Relief Valve Geometry for Low Pulsation Control
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Solution Overview
Problem
Conventional relief valves in high-pressure pumps experience pressure pulsation issues when reducing fluid pressure, leading to potential damage and inefficiencies due to drastic changes in passage area and throttling effects.
Innovation Solution
A relief valve design with a valve member that gradually changes the overlap area and minimum passage area between an intermediate chamber and a hole as it moves, allowing for controlled fluid flow and pressure reduction, thereby minimizing pressure pulsation by increasing the passage area when pressure exceeds a threshold and throttling the flow when approaching the valve seat.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the minimum passage area between the movable holder and the guide hole is set to be discontinuous such that the area becomes larger drastically after the movable holder is moved beyond a predetermined position, then the fluid pressure in the discharge passage can be decreased quickly, but pressure pulsation is generated in the fluid
Solution Approach 1:
The passage area between the movable holder and guide hole is designed to change dynamically based on the position of the movable holder. Specifically, the passage area is smaller when the movable holder is at positions where it should restrict flow (near the predetermined position) and larger when it should allow flow (away from the predetermined position). This dynamic adjustment eliminates pressure pulsation while maintaining quick pressure decrease capability.
2Productivity
If the minimum passage area is set to be discontinuous such that the area becomes smaller drastically after the movable holder is moved close to the valve seat, then the flow of fluid toward the pressurizing chamber is throttled, but pressure pulsation is generated in the fluid
Solution Approach 1:
The passage area is designed to change dynamically with the movable holder position. When the movable holder is close to the valve seat, the passage area is smaller to throttle flow efficiently. When the movable holder moves away, the passage area becomes larger to prevent pressure pulsation. This dynamic configuration achieves both flow control efficiency and pressure stability.
3Speed
If a conventional relief valve design is used with discontinuous minimum passage area, then pressure can be decreased quickly, but members that form spaces communicated with the discharge passage may be damaged due to pressure pulsation
Solution Approach 1:
The passage area between the movable holder and guide hole is designed to change dynamically based on movable holder position. The passage area is configured to be smaller when the movable holder is near positions that could cause pressure pulsation, and larger when it is at positions where pressure pulsation is less likely. This eliminates pressure pulsation that could damage components while maintaining quick pressure response capability.
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 effectively suppresses pressure pulsation in the fluid and the connected spaces, ensuring stable operation and reducing the risk of damage by allowing for smooth pressure regulation and maintaining efficient pump performance.
Implementation Method 1
a biasing member (60) that biases the valve member (50) toward the valve seat portion (40)
Implementation Method 2
capable of decreasing fluid pressure in the first space (101)
Data Source
AI summary
A valve member includes a specific range in which an overlap area that is an area in which a hole opening and a slide outer wall are overlapped with each other becomes gradually smaller and a minimum passage area that is a passage area between an intermediate chamber and a first hole being minimum becomes gradually larger as the valve member is moved in a direction away from a valve seat portion in a movable range in the axial direction.