Feedback Throttle Flow Control Valve for Stable Precision Control
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Solution Overview
Problem
Existing flow control valves face challenges in achieving high-precision flow control due to limited proportional control ranges and vibrational behavior caused by fluid forces near the displacement where the main valve throttle switches between open and shut-off modes.
Innovation Solution
The flow control valve incorporates a feedback throttle with boundary portions that adjust the ratio of change in the opening amount, allowing for expanded proportional control ranges and reducing vibrational behavior by optimizing the displacement area of the main valve.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the opening amount of the pilot throttle is reduced to control the main valve displacement, then the flow rate control precision is improved, but the proportional control range is limited and vibrational behavior occurs near the shut-off position
Solution Approach 1:
The feedback throttle is divided into multiple sections with different opening amounts along the axial direction of the main valve. Each section provides a different ratio of change in opening amount relative to main valve displacement, allowing the system to expand the proportional control range while maintaining control precision across different operating conditions
Solution Approach 2:
The feedback throttle's opening amount is made dynamically adjustable based on the main valve's displacement position. By providing multiple sections with different opening characteristics, the system adapts the feedback throttle's response ratio according to the operating range, enabling both high precision control and expanded proportional control range
2Measurement precision
If the main valve displacement is reduced to achieve precise flow control, then the flow rate accuracy is improved, but fluid forces cause vibrational behavior near the shut-off position
Solution Approach 1:
The feedback throttle is segmented into multiple sections with different opening amounts. This segmentation allows the system to provide different feedback forces at different displacement positions, stabilizing the main valve by counteracting fluid forces that cause vibration near the shut-off position while maintaining precise flow control
Solution Approach 2:
The feedback throttle provides position feedback by creating a pressure differential that generates a feedback force on the main valve. This feedback mechanism counteracts the fluid forces causing vibration, stabilizing the valve displacement while enabling precise flow control through the controlled opening amount
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 configuration enables high-precision flow control by expanding the proportional control range of the main valve throttle and inhibiting vibrational behavior, thereby improving the overall performance of the flow control valve.
Implementation Method 1
a feedback throttle (54) provided between the feedback flow passage (49) and the back pressure chamber (47) and increasing the opening amount between the feedback flow passage (49) and the back pressure chamber (47) as the main valve (43) is displaced in the direction away from the main valve seat (46)
Implementation Method 2
a pilot valve (55) slidably provided in the housing (22); and a pilot throttle (56) provided in the pilot valve (55) and decreasing or increasing the opening amount of the pilot flow passage (50) as the pilot valve (55) is displaced
Implementation Method 3
a main valve throttle (53) provided in the main valve (43) and increasing the opening amount between the inlet side flow passage (25) and the outlet side flow passage (27) as the main valve (43) is displaced in the direction away from the main valve seat (46)
Data Source
AI summary
A feedback throttle (54) increases the opening amount between a feedback flow passage (49) and a back pressure chamber (47) as a main valve (43) is displaced in the direction away from a main valve seat (46). The feedback throttle (54) has a boundary portion K that divides a section where the opening amount of the feedback throttle (54) changes such that a ratio of change in the opening amount of the feedback throttle (54) to a displacement of the main valve (43) in the direction coming closer to the main valve seat (46) becomes smaller. The boundary portion K is located in a displacement area of the main valve (43) corresponding to a position where an opening portion of a main valve throttle (53) is shut off with respect to the displacement of the main valve (43) in the direction coming closer to the main valve seat (46).