Gate Valve With Adjustable Movable Valves for Back Pressure Cancellation
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Solution Overview
Problem
Conventional gate valves face challenges in achieving high reliability for isolation operations, weight savings, and 100% back pressure cancellation, especially in large-scale applications, due to complex configurations and high driving power requirements.
Innovation Solution
A gate valve design featuring a neutral valve body with movable valves and force-applying units that allow for adjustable thickness and positioning, eliminating the need for an air cylinder and supply line, and utilizing a lifting and lowering mechanism within the valve box to achieve 100% back pressure cancellation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional gate valves use air cylinders and supply lines for actuation, then the valve can achieve opening and closing operations, but the device complexity increases and weight increases
Solution Approach 1:
The invention extracts and eliminates the air cylinder and supply line components from the valve actuation system. Instead of using pneumatic actuation, the patent employs a direct mechanical actuation mechanism where the actuator is integrally connected to the valve plate, removing the need for complex pneumatic infrastructure while maintaining operational capability
Solution Approach 2:
The invention merges the actuator and valve plate into a unified mechanical system. The actuator is directly coupled to the valve plate through mechanical connection, combining the actuation function and valve closure function into a single integrated mechanism, thereby reducing device complexity and eliminating intermediate components like air cylinders
2Ease of operation
If conventional gate valves use air cylinders for actuation, then the valve can perform opening and closing operations, but the weight of the valve increases
Solution Approach 1:
The invention removes the air cylinder and associated pneumatic components from the valve assembly. By eliminating these heavy components and replacing them with a compact mechanical actuation system directly coupled to the valve plate, the overall weight of the moving valve assembly is significantly reduced while maintaining full operational capability
3Area of stationary object
If conventional gate valves are designed for large-scale applications, then the valve can handle larger flow passages, but the driving power requirement increases
Solution Approach 1:
The invention segments the valve plate into multiple sections or segments that can be actuated independently or collectively. This segmentation allows the large valve to be controlled through distributed mechanical advantage, reducing the peak driving power required compared to a single large moving mass, while still achieving complete flow passage coverage
Solution Approach 2:
The invention employs dynamic actuation mechanisms that optimize the force application throughout the valve operation cycle. By using mechanical linkages with varying leverage ratios during opening and closing, the system minimizes peak power requirements while maintaining effective actuation of large-scale valve plates
4Device complexity
If conventional gate valves lack back pressure cancellation mechanisms, then the configuration is simpler, but the reliability of isolation operations decreases
Solution Approach 1:
The invention incorporates a back pressure cancellation mechanism that applies counteracting force to balance the pressure differential across the valve plate during isolation operations. This counterweight mechanism compensates for the harmful back pressure effect, ensuring reliable sealing and isolation performance without requiring overly complex additional systems
Data Source
AI summary
A gate valve of the invention includes a valve box, a neutral valve body, and a rotation shaft. The neutral valve body includes a neutral valve and a movable valve. The movable valve includes a first movable valve and a second movable valve. The gate valve includes a plurality of first force-applying units, a second force-applying unit, and a third force-applying unit. The third force-applying unit applies a force to the first movable valve. The first force-applying units apply a force to the first movable valve and thereby causing the seal portion to be in close contact with a valve box inner surface located at a periphery of the first opening portion. The second force-applying unit drives the first movable valve and the second movable valve so that thicknesses thereof in the flow passage direction are adjustable.