Globe Valve Seat Ring Assembly for Repairable Steam Sealing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
High pressure steam valves in power plants face issues with thermal contraction and stress relaxation, leading to leakage and the need for frequent replacement due to damaged seating surfaces, which is costly and inefficient.
Innovation Solution
A globe valve design with a separately formed stem and plug, actuated by a specially designed subassembly, allowing for easy replacement of the disk and seat assembly, where the seat ring is held by a sleeve rather than being molded to the main valve body, enabling independent repair or replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the valve is designed with integral hard-faced metal seats molded to the main valve body, then the sealing performance is improved, but the ease of repair deteriorates because the entire valve must be machined to repair a faulty seat assembly
Solution Approach 1:
The valve is divided into separable components: the seat ring is a distinct element that can be removed from the valve body through the stem assembly, allowing the seat ring to be replaced independently while maintaining the sealing performance of the integral design
Solution Approach 2:
The seat ring is extracted from the traditional molded-in configuration and made removable through the stem assembly mechanism, enabling the seat ring to be taken out for replacement without machining the entire valve body while preserving the sealing interface
2Ease of manufacture
If the disk and seat assembly are designed as integrated components, then the manufacturing simplicity is improved, but the productivity deteriorates due to frequent complete valve replacements instead of component replacement
Solution Approach 1:
The valve assembly is segmented into replaceable components (stem, plug, seat ring) that can be independently replaced, transforming the replacement process from replacing the entire valve to replacing only the damaged components, thereby improving productivity
Solution Approach 2:
Instead of discarding the entire valve when a component fails, the design allows for recovering the functional valve body and replacing only the damaged seat ring or stem assembly, reducing waste and improving operational productivity
3Device complexity
If the stem and plug are formed as a single integral component, then the device complexity is reduced, but the ease of repair deteriorates because the entire assembly must be replaced when either component needs maintenance
Solution Approach 1:
The stem and plug are separated into distinct components that can be independently maintained and replaced, allowing repair of only the faulty component rather than replacing the entire assembly, thus improving ease of repair with minimal increase in device complexity
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 ensures secure sealing performance, reduces maintenance costs, and allows for quick and cost-effective replacement of damaged components, improving operational efficiency and extending valve lifespan.
Implementation Method 1
a seat ring releasably held in place in the valve body by the sleeve at at least one of the first opening or the second opening
Implementation Method 2
a plug releasably engaged to the stem and configured to contact the seat ring to control the flow of the substance through the valve assembly
Data Source
AI summary
A valve assembly for controlling a flow of a substance through the valve assembly includes a valve body defining an inlet, an outlet, and a volume therebetween and a sleeve disposed in at least a portion of the volume, an interior of the sleeve having a first opening in fluid communication with the inlet and a second opening in communication with the outlet. The valve assembly also includes a seat ring releasably held in place in the valve body by the sleeve at at least one of the first opening or the second opening. The valve assembly further includes a stem disposed in the sleeve and a plug releasably engaged to the stem and configured to contact the seat ring to control the flow of the substance through the valve assembly.