Control valve
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Solution Overview
Problem
Motor operated valves in refrigeration cycles face increased load during valve opening due to changing pressure receiving diameter of the valve element, leading to higher rotational torque requirements for the motor.
Innovation Solution
A control valve design featuring a tapered face structure where the valve element touches and leaves the valve seat, maintaining a consistent clearance and reducing the pressure receiving diameter change, thereby minimizing the load on the actuator during valve opening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the valve element is designed to touch and leave the valve seat from the downstream side, then good valve closing performance is achieved, but the pressure receiving diameter changes at valve opening causing increased load on the actuator
Solution Approach 1:
The valve element is divided into functionally distinct regions: a leading end portion for insertion into the valve hole with minimal pressure reception, and an edge portion for sealing contact with the valve seat. This segmentation allows the pressure receiving diameter to remain small during opening while maintaining effective sealing at the edge, thereby reducing actuator load without compromising valve closing performance.
Solution Approach 2:
Different portions of the valve element are given different functional qualities: the leading end is designed with a smaller diameter to minimize pressure reception during opening, while the edge portion is configured to provide effective sealing contact with the valve seat. This local differentiation resolves the contradiction by optimizing each region for its specific function.
2Reliability
If the pressure receiving diameter of the valve element is increased to improve sealing, then valve closing performance improves, but the load on the actuator during valve opening increases
Solution Approach 1:
The valve element is segmented into a leading end portion with smaller diameter for reduced pressure reception during opening, and an edge portion with optimized geometry for effective sealing. This allows the sealing function to be maintained without increasing the overall pressure receiving diameter, thereby reducing the power required by the motor during valve opening.
Solution Approach 2:
The valve element is designed to dynamically interact with the valve hole during operation: the leading end inserts into the valve hole during opening to minimize pressure reception, while the edge portion makes contact with the valve seat during closing. This dynamic configuration allows effective sealing without requiring a large pressure receiving diameter, reducing motor power requirements.
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 design reduces the load on the actuator and motor, enhancing valve opening efficiency by maintaining a stable pressure difference and minimizing sliding resistance, thus reducing the rotational torque needed for valve operation.
Implementation Method 1
the pressure receiving diameter of the valve element changes at the start of valve opening, which increases the valve closing load
Implementation Method 2
a feed screw mechanism that converts rotational movement of the rotor into translational movement of the shaft
Implementation Method 3
a seal ring that reduces sliding resistance between the valve element and the valve hole
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
A control valve (1) according to an embodiment includes: a body (10) including an inlet port (18), an outlet port (20), a valve hole (30), and a valve seat (32) located in the valve hole (30); a valve element (40) that touches and leave the valve seat (32) to close and open a valve section; and an actuator (8) that drives the valve element (40) in opening and closing directions of the valve section. The valve section has an opening and closing structure including: an insertion and removal structure in which a leading end of the valve element (40) coaxially moves into and out of the valve hole (30); and a touching and leaving structure in which an edge portion of one of the valve element (40) and the valve seat (32) touches and leaves a tapered face of the other thereof with the leading end of the valve element (40) being inserted in the valve hole (30).