Valve Apparatus Bypass Pipe Reduces Driving Torque
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Solution Overview
Problem
Conventional ball valves require high driving torque due to large frictional forces and are unable to precisely control flow rates, as they have inherent flow characteristics of a quick-open valve.
Innovation Solution
A valve apparatus comprising a bypass pipe and two valves - a ball valve and a pintle valve - that work in conjunction to reduce pressure differences and allow precise control of flow rates by using a bypass pipe to alleviate pressure differences and a pintle valve to adjust the degree of opening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a conventional ball valve is used with a linear flow path opened to almost the same size as the inner diameter of the pipe, then the flow coefficient is high, but the actuator considerably increases in size because large driving torque is required due to large frictional force
Solution Approach 1:
The invention divides the flow control function into two separate valves: a ball valve for main flow control and a needle valve for precise flow rate adjustment. This segmentation allows each valve to be optimized for its specific function, reducing the driving torque required for the ball valve while maintaining high flow coefficient capability
Solution Approach 2:
The needle valve acts as an intermediary component that works in conjunction with the ball valve. By introducing this intermediate flow control element, the system can achieve precise flow rate control without requiring the ball valve to handle the full range of flow adjustments, thereby reducing friction and driving torque requirements
2Device complexity
If a conventional ball valve is used, then the structure is simple, but it is impossible to control the flow rate because an inherent flow coefficient curve of the ball valve has flow characteristics of a quick-open valve
Solution Approach 1:
The invention segments the flow control function into two valves: the ball valve provides simple on/off control with quick-open characteristics, while the needle valve provides precise flow rate adjustment. This segmentation maintains structural simplicity while enabling precise flow control capability
Solution Approach 2:
The invention merges two different valve types (ball valve and needle valve) into a single integrated flow control system. The ball valve handles the main flow path with quick-open characteristics, while the needle valve provides fine-tuned flow rate control, combining the advantages of both valve types
Data Source
AI summary
There is provided a valve apparatus provided in a pipe. The valve apparatus includes a bypass pipe connected in parallel to the pipe, a first valve configured to adjust a flow rate of a fluid flowing an inlet part of the pipe to an outlet part of the pipe, and a second valve configured to adjust a flow rate of the fluid flowing the bypass pipe to the outlet part.