Valve Cavity Cap Assembly for Multi-Passage Metal Sealing
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Solution Overview
Problem
In multi-valve manifold systems, there is a need for a solution that can provide precise control over fluid flow by sealing the central and radially offset passages effectively, while allowing for variable configuration and minimizing shell leakage, especially in applications where flow through one or more valve positions is not desired.
Innovation Solution
A valve cavity cap arrangement comprising an insert with inner and outer annular sealing surfaces and a threaded cap that applies sealing forces to these surfaces, providing a metal-to-metal seal and allowing for independent adjustment to accommodate dimensional tolerances and maximize flow capacity, with optional features like flow diversion capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional single-seal valve cavity cap is used, then the structure is simple, but it cannot effectively seal both the central passage and radially offset passages simultaneously, leading to shell leakage
Solution Approach 1:
The valve cavity cap is segmented into a multi-component assembly including a body seal that engages with multiple sealing surfaces around different passages. This segmentation allows independent sealing of the central passage and radially offset passages, preventing shell leakage while maintaining a manageable structural complexity through modular design.
2Adaptability or versatility
If fixed dimensional tolerances are used in the valve cavity cap, then manufacturing is easier, but it cannot accommodate variable configurations and may cause leakage
Solution Approach 1:
The valve cavity cap design incorporates adjustable parameters including variable sealing surface positions and adaptable engagement dimensions. The body seal can be positioned at different locations around the passages, and the sealing surfaces can accommodate dimensional variations within specified tolerances, providing configuration flexibility without requiring precision manufacturing beyond standard capabilities.
3Productivity
If the valve cavity cap applies uniform sealing force, then the structure is simpler, but it cannot maximize flow capacity while preventing leakage in multi-passage configurations
Solution Approach 1:
The valve cavity cap employs local quality variations in the sealing design, with different sealing surfaces positioned at specific locations around the central and radially offset passages. The body seal applies sealing force at multiple discrete contact points rather than uniformly, allowing optimization of flow capacity in each passage while maintaining effective sealing through locally adapted sealing geometries.
Data Source
AI summary
A valve cavity cap arrangement including an insert and a threaded cap is provided in combination with a valve body defining a valve cavity, a central passage, and at least one offset passage. The insert is received in the valve cavity and includes an inner annular sealing surface sized to seal against a portion of the recessed surface surrounding the central passage, an outer annular sealing surface sized to seal against an outer periphery of the recessed surface, surrounding the offset passage(s), and a solid web portion extending between the inner and outer annular sealing surfaces. The threaded cap includes an outer threaded portion threadably engaged with an internal threaded portion of the valve cavity, a central end portion configured to apply a first sealing force to the inner annular sealing surface, and an outer end portion configured to apply a second sealing force to the outer annular sealing surface.