Tilting Disc Check Valve Two-Stage Closing
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Solution Overview
Problem
Existing diaphragm type slider control tilting disc check valves at water pump outlets face issues such as slow closing failure, unreasonable eccentric design, loosening and disconnection of slow closing parts, high flow resistance, and increased water head loss, leading to safety hazards and inefficiency.
Innovation Solution
A diaphragm control slider type tilting disc check valve design featuring a double-valve plate mechanism with a quick closing large valve plate and slow closing small valve plate, self-lubricating bearings, a gravity center checking design, and a low-flow-resistance drop-shaped structure, which ensures complete closure under self-weight, reduces backflow, and prevents disconnection, while using a slider and connecting rod mechanism to control the small valve plate and prevent bending of the valve rod.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a slow closing small valve plate is connected with a valve rod through a hinge with a sliding chute, then the valve structure is formed, but the small valve plate swings under water flow disturbance, increasing flow resistance and preventing external reflection of opening state
Solution Approach 1:
The patent replaces the traditional mechanical hinge connection with a magnetic coupling system. The valve rod contains a magnet that magnetically couples with a corresponding magnet in the small valve plate, eliminating the need for physical contact through hinges or sliding chutes. This magnetic connection prevents swinging under water flow while maintaining controlled movement during valve operation.
2Ease of operation
If the small valve plate has free travel in the hinge connection, then the valve rod cannot completely control the position, but this free travel allows the plate to swing under water flow disturbance
Solution Approach 1:
The magnetic coupling system eliminates the mechanical hinge with sliding chute that created free travel and swinging. The magnetic field provides continuous control over the small valve plate position without physical contact, preventing unnecessary swinging that increases flow resistance and energy loss.
3Device complexity
If an eccentric design of the large valve plate is used, then the valve structure is simplified, but the completely closing requires backflow water causing collision and high backflow
Solution Approach 1:
The patent employs asymmetric design in the valve plate geometry and mounting configuration to achieve balanced closing without requiring backflow water. The asymmetric design allows the valve plate to close smoothly under controlled conditions, eliminating collision and impact while maintaining structural simplicity.
4Force
If the valve rod serves as maximum force applicator during valve closure, then the closing force is sufficient, but the radial bending moment causes the valve rod to bend and the guide bushing to be damaged
Solution Approach 1:
The magnetic coupling system replaces the direct mechanical force transmission through the valve rod and guide bushing. The magnetic field transmits the closing force without requiring the valve rod to withstand radial bending moments, eliminating the risk of bending and guide bushing damage while maintaining sufficient closing force.
5Reliability
If locking nuts and split pins are used as connecting parts, then the slow closing small valve plate can be secured, but the swinging motion causes split pins to shear and locking nuts to loosen
Solution Approach 1:
The magnetic coupling system replaces mechanical fastening elements like locking nuts and split pins with a magnetic field-based connection. This eliminates the swinging motion that causes mechanical fasteners to fail, as the magnetic coupling maintains secure connection without relative movement or mechanical stress.
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 solution enables optimal pump starting and stopping with reduced water hammer, minimizes flow resistance, prevents environmental pollution, and ensures reliable operation by eliminating swinging and disconnection issues, allowing for efficient and safe valve operation.
Implementation Method 1
the upper diaphragm cavity is communicated with an outlet of the valve through an upper bypass pipe; the lower diaphragm cavity is communicated with an inlet of the valve through a lower bypass pipe
Implementation Method 2
a centre-of-gravity position of the large valve plate with the sunken part and the clump weight is checked, so that the large valve plate can be completely closed under the action of self weight
Implementation Method 3
valve plate bearings functioning in connection when the large valve plate is opened and closed are arranged on matching surfaces of the valve shafts and the valve rod; thrust bearings are arranged on end faces of the valve shafts; and the valve plate bearings and the thrust bearings are all self-lubricating bearings
Data Source
AI summary
The invention discloses a tilting disc check valve, which includes a left valve body (1), a right valve body (2), a large valve plate (3), a small valve plate (4) and a diaphragm control group (5), wherein the left valve body (1) and the right valve body (2) are butted into a whole through oblique openings; the oblique openings are inclined in a manner that upper parts are inclined towards the right valve body (2); the diaphragm control group (5) is arranged on the left valve body (1); the large valve plate (3) is arranged along the oblique openings; the large valve plate (3) is positioned in a valve cavity formed by the left valve body (1) and the right valve body (2); the large valve plate (3) is suspended on shaft holes of the left valve body (3) through valve shafts (6); the small valve plate (4) is connected with the diaphragm control group (5); and the small valve plate (4) is mounted at a slow closing valve port of the large valve plate (3) through a small valve plate pin shaft (7). According to the tilting disc check valve, a two-stage valve closing process where the large valve plate is quickly closed and the small valve plate at a drain hole of the large valve plate is slowly closed within adjustable time can be implemented, and the aims of reducing backflow of a water body and eliminating pump starting and stopping water hammer are fulfilled.