High Pressure Pump Valve Seat Force Fit Structure
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Solution Overview
Problem
High pressure water pumps face leakage issues at critical areas such as the pump piston and cylinder seal packings and inlet valves, which are challenging to seal effectively at pressures up to 55,000 psi.
Innovation Solution
A unique valve seat and seal housing structure are designed, where the inner and outer portions are force-fitted together, with a curved shoulder and fluid plenum to direct water flow radially inward, enhancing sealing and reducing leakage by using a spring-biased inlet valve within a recessed valve seat.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional sealing structures are used in high pressure water pumps, then the device complexity is low, but leakage occurs at critical areas such as seal packings and inlet valves under pressures up to 55,000 psi
Solution Approach 1:
The valve seat is divided into an inner portion and an outer portion that are force fit together, creating separate functional zones. The seal housing is similarly segmented with an inner portion carrying seal packings and an outer portion providing structural support. This segmentation allows each portion to be optimized for its specific function while maintaining overall sealing integrity under high pressure.
Solution Approach 2:
The inner portion of the valve seat is force fit within the outer portion, creating a nested structure. The inner seal housing portion is mounted within the outer seal housing portion. This nested arrangement allows the smaller, more precision-critical components to be housed within the larger structural components, maximizing space utilization and sealing effectiveness.
2Reliability
If a force fit structure is used between inner and outer portions, then sealing reliability improves, but manufacturing precision requirements increase
Solution Approach 1:
The force fit connection utilizes interference fit parameters where the inner portion is slightly larger than the outer portion's opening, creating a press-fit connection. This parameter change from clearance fit to interference fit ensures rigid positioning and sealing contact under high pressure while maintaining manufacturability through standard machining tolerances.
3Manufacturing precision
If a curved shoulder is added to bottom out the inner portion, then positioning accuracy improves, but device complexity increases
Solution Approach 1:
The curved shoulder on the inner seal housing portion provides a rounded bottoming surface that guides and positions the inner portion during assembly. This curved geometry distributes assembly forces evenly, prevents misalignment, and ensures proper seating of the inner portion within the outer portion, improving positioning accuracy while adding minimal structural complexity.
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 effectively seals high-pressure water pumps by minimizing leakage through a robust seal housing and valve seat design, ensuring reliable operation across a wide pressure range.
Implementation Method 1
The two are force fit together, and an end of the inner portion remote from the pump chamber is formed with a curved shoulder to bottom out within the outer portion.
Implementation Method 2
a spring-biased inlet valve within a recessed valve seat
Data Source
AI summary
A valve seat for use in a high pressure pump comprises an inner portion force fit within an outer portion. The outer portion has a fluid plenum at an outer peripheral surface. Fluid passages extend radially inwardly to communicate with a valve recess in the inner portion. A seal housing for a high pressure pump comprises an outer portion and an inner portion. The inner portion is force fit within the outer portion. The inner portion has an inner bore having a first location to receive seal packings, and a second location to receive valve spring structure. The inner portion has a curved surface that bottoms out against a curved surface within the outer portion.