Valve Stepped Seat Face for High-Pressure Pump Flow and Machining
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Solution Overview
Problem
High-pressure pump valves with conical seat faces require complex and time-consuming machining, leading to material removal and potential wear issues, as well as suboptimal flow due to large flow deflection and associated losses.
Innovation Solution
The valve features a stepped seat face with adjoining faces of varying inclinations, allowing for easier machining, preserving the hardened surface layer, and reducing flow losses through gradual flow deflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large conical seat face is used to ensure sealing, then sealing reliability is improved, but machining complexity and time increase significantly
Solution Approach 1:
The seat face is divided into multiple stepped surfaces with different inclinations rather than a single large conical surface. Each step can be machined separately with simpler tools and processes, reducing overall machining complexity while maintaining the total sealing area through the combined surface of multiple steps.
2Reliability
If a large conical seat face is used to ensure sealing, then sealing reliability is improved, but material removal increases and hardened surface layer is removed
Solution Approach 1:
The seat face is segmented into multiple stepped surfaces, allowing the sealing function to be distributed across several smaller surfaces rather than requiring removal of material from a single large area. This preserves the hardened surface layer on portions of the housing that would otherwise be removed.
3Reliability
If a large conical seat face is used, then sealing is improved, but flow losses increase due to major flow deflection
Solution Approach 1:
The flow path is segmented into multiple stages by the stepped surfaces, allowing gradual flow deflection across several smaller angle changes rather than one large deflection. This reduces flow separation and turbulence, minimizing energy losses while maintaining sealing effectiveness.
Solution Approach 2:
The stepped surfaces are designed with curved transitions rather than sharp edges, creating smooth flow paths that guide the fluid gradually from one direction to another. This curvature reduces flow separation and turbulence, minimizing energy losses associated with major flow deflection.
4Ease of manufacture
If the seat face is made short in length, then machining is simplified, but sealing reliability may be compromised
Solution Approach 1:
The sealing function is segmented across multiple stepped surfaces, so that each individual surface can be short and easy to machine, while the cumulative sealing area across all steps provides sufficient sealing reliability. No single surface needs to be long, but the combination of surfaces achieves the required sealing performance.
Data Source
AI summary
A valve having a valve member, which cooperates with a valve seat formed in a housing part in order to control a connection, and the valve seat has an at least approximately conical seat face, which is located at a transition of the connection from a portion of small diameter to a portion of large diameter. The seat face is adjoined, on its side oriented toward the portion of large diameter, by at least one face which is more markedly inclined relative to the longitudinal axis of the connection than the seat face, and on its side oriented toward the portion of small diameter, the seat face is adjoined by at least one face which is less markedly inclined relative to the longitudinal axis of the connection than the seat face.