Swing Check Valve Seat Assembly for In-Line Maintenance
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Solution Overview
Problem
Flapper check valves in harsh environments require regular maintenance due to wear, necessitating time-consuming disconnection from fluid handling components for servicing, and external components like lock levers and slam dampeners are not designed for easy interchangeability.
Innovation Solution
A swing check valve system with a removable valve seat and key assembly that allows for interchangeable external components, reducing wear by protecting critical components during pigging and enabling easy maintenance without disconnecting from the line.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the valve includes integrated external components like lock levers and slam dampeners, then the valve provides protection during pigging and reduces water hammer effect, but the components cannot be changed or maintained without replacing the entire valve
Solution Approach 1:
The valve is divided into separable components: the body, the flapper assembly, and external components (lock lever, slam dampener) are made interchangeable through standardized mounting interfaces. This allows external components to be replaced independently without replacing the entire valve, resolving the contradiction between providing protection and enabling easy maintenance.
2Ease of repair
If the valve is disconnected from adjacent components for servicing, then wear damage to critical components can be repaired or replaced, but the process is time-consuming and expensive
Solution Approach 1:
The valve assembly is segmented into independently serviceable components. The flapper assembly can be removed and serviced separately from the valve body, and external components can be replaced without disconnecting from adjacent pipeline components. This modular design eliminates the need for complete valve disassembly, reducing maintenance downtime while providing full access to critical wear surfaces.
3Reliability
If the valve operates in harsh environments with debris and severe conditions, then the valve prevents backflow reliably, but components accumulate wear that affects inaccessible locations
Solution Approach 1:
The valve is designed with separable assemblies where the flapper and seat can be removed as a unit from the valve body. This segmentation allows complete access to wear-prone surfaces (flapper edges, seat surface) for inspection and replacement, while the valve body remains installed in the pipeline. The reliable backflow prevention function is maintained through robust sealing surfaces that can be serviced without compromising the harsh environment performance.
Data Source
AI summary
A swing check valve includes a body and a swing assembly, the body including an inner volume having a middle portion extending between an upstream end portion and a downstream end portion and a wall that surrounds the inner volume and the swing assembly including a disc having an upstream surface that faces the upstream end portion when the disc is in a closed position and a downstream surface that faces the downstream end portion when the disc is in the closed position and a valve seat having an outer circumferential surface in contact with the wall. The body also includes a flow path extending from the upstream end portion to the downstream end portion, wherein the middle portion includes the flow path and an upper recess positioned above the flow path.