Pump Control Valve Cross-Section for Abrupt Flow Release
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Solution Overview
Problem
Existing control valves for pumps exhibit a proportional or constant increase in fluid flow from zero overlap to maximum negative overlap, lacking an abrupt increase in fluid flow, which is advantageous for fluid delivery applications.
Innovation Solution
The control valve design includes a recess in the valve housing and a piston with offset control edges, allowing for a change from positive to negative overlap and vice versa, enabling an abrupt increase in fluid flow by altering the effective flow cross-section through the port opening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the piston control edge passes the control edge of the valve housing with slight movement, then the fluid flow is released, but the fluid flow increase is proportional or constant rather than abrupt
Solution Approach 1:
The control edge is segmented into two distinct parts: a port control edge and a recess control edge that is axially offset. This segmentation allows the piston to control fluid flow through two separate stages - first through the port opening and then through the recess, creating an abrupt increase in flow capacity when transitioning from positive to negative overlap
Solution Approach 2:
The invention introduces an axial offset dimension between the port control edge and recess control edge. This dimensional change creates a stepped control mechanism where the recess control edge is positioned axially behind the port control edge, enabling a sudden expansion of the effective flow cross-section when the piston moves into negative overlap position
2Productivity
If the recess control edge is axially offset from the port control edge, then an abrupt increase in fluid flow is achieved, but the valve housing structure becomes more complex
Solution Approach 1:
The recess is nested within the valve housing structure, with the recess control edge formed as an integral part of the housing. This nesting approach allows the complex functionality of axial offset control edges to be achieved within the existing housing geometry without requiring separate components or assemblies
Solution Approach 2:
The recess control edge serves multiple functions: it provides the axially offset control surface for abrupt flow increase, maintains structural integrity of the valve housing, and works in conjunction with the port control edge to create the two-stage flow control mechanism. This multi-functionality reduces the need for additional components
Data Source
AI summary
A control valve for a pump for delivering a fluid. The control valve includes: a valve housing which delineates a piston chamber; a piston which can be moved within the piston chamber; and a fluid channel which ports into the piston chamber via a port opening, wherein the port opening defines a port control edge. The valve housing includes a recess which extends into the fluid channel, wherein the recess defines a recess control edge which is axially offset with respect to the port control edge, and/or the piston includes a piston recess which defines a piston recess control edge.