Balanced Globe Valve Plug with Pressure Equalizing Openings
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Solution Overview
Problem
Unbalanced globe valves require high operational forces due to unbalanced pressure, necessitating strong and expensive actuators, which limits their application to smaller sizes and lower system pressures.
Innovation Solution
A balanced globe valve design with a valve member featuring small openings to balance fluid pressure, reducing operational forces and allowing the use of lower-power actuators for larger valves and higher system pressures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If an unbalanced globe valve with a solid plug is used, then the valve design is simple, but large forces are required to operate the valve
Solution Approach 1:
The solid plug is segmented by introducing small openings that allow fluid communication between the upper and lower sides. This segmentation enables pressure equalization while maintaining the overall solid structure, thus reducing operational force without significantly increasing design complexity
Solution Approach 2:
The small openings act as intermediaries that allow fluid pressure to be transmitted between the upper and lower sides of the plug. This intermediary mechanism balances the pressure distribution, reducing the net force required to operate the valve
2Force
If a balanced globe valve with large cavities in the plug is used, then operational forces are reduced, but the design becomes more complex
Solution Approach 1:
Instead of creating large cavities throughout the plug, small localized openings are introduced at specific locations. This local modification achieves pressure balancing while maintaining the solid structure elsewhere, thus reducing operational force with minimal increase in design complexity
Solution Approach 2:
The plug design transitions from a completely solid structure to one with small openings, changing the physical parameter of fluid permeability. This parameter change enables pressure equalization and force reduction while maintaining the overall solid plug configuration
3Length of moving object
If larger valve sizes are required, then unbalanced valves require even stronger and more expensive actuators
Solution Approach 1:
The small openings in the plug perform preliminary pressure equalization before the valve operation begins. By balancing the pressure in advance, the actuator only needs to overcome friction and small imbalances, rather than large pressure differential forces, enabling larger valves to use lower-power actuators
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 balanced design reduces the force required to operate the valve, enabling the use of lower-power actuators for larger valves and higher system pressures while maintaining leak-tight shut-off, thus reducing actuator costs and expanding application range.
Implementation Method 1
The small opening may extend from the top surface to the bottom surface... to balance the valve member
Data Source
AI summary
A balanced globe valve assembly includes a housing having an inlet and an outlet and a cage disposed within the housing between the inlet and the outlet. The cage includes a valve seat and at least one port formed therein. The balanced globe valve assembly further includes a valve member disposed within the cage and coupled to the housing. The valve member is movable within the cage between an open position in which the valve member is spaced from the valve seat and a closed position in which the valve member is seated within the valve seat so that the valve member blocks the at least one port. The valve member has a small opening formed therein to balance the valve member.