Compressor Valve Cover-Ring Retrofit for Uniform Seal Compression
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Solution Overview
Problem
Existing systems for retaining valve assemblies in compressor cylinders, such as the jackbolt cage-cover assembly, face challenges like gas leakage due to uneven compression of seals and require significant machining for retrofitting, making them impractical for existing compressors.
Innovation Solution
A system comprising a ring with a through-hole and a cover that can slide relative to each other, using O-rings for sealing, and a retainer to hold the ring in place, allowing for adjustable compression of seals without requiring significant machining, thereby maintaining seal integrity and facilitating retrofitting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a jackbolt cage-cover assembly is used to retain the valve assembly, then the valve assembly can be secured in the cavity, but gas leakage occurs due to uneven compression of the cover gasket seal
Solution Approach 1:
A compliant intermediary layer (such as a compliant gasket or sealing element) is introduced between the cover and the cavity flange. This intermediary layer compensates for surface irregularities and distributes the compressive load uniformly, ensuring even sealing pressure across the entire gasket interface without requiring precise machining or manual adjustment.
2Reliability
If the jackbolt is tightened to compress the valve gasket seal, then the seal compression improves, but the cover gasket seal may become overloaded and fail
Solution Approach 1:
The sealing function is segmented into two independent systems: one for the cover gasket seal and another for the valve gasket seal. The cover gasket seal is compressed by the cover bolts independently, while the valve gasket seal is compressed by the jackbolt separately. This segmentation allows each seal to be optimized and adjusted independently, preventing load transfer that could cause one seal to fail while the other is insufficiently compressed.
3Adaptability or versatility
If significant machining is performed on the cavity to enable retrofitting, then the valve assembly can be securely retained, but the retrofitting complexity and cost increase
Solution Approach 1:
The cover and cage assembly is designed as a universal retrofit kit that can be installed in existing compressor cavities without significant machining. The design incorporates adjustable and compliant elements that adapt to various cavity geometries and surface conditions, enabling the same assembly to serve multiple existing compressor models while requiring minimal modification to the original cavity structure.
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 solution effectively compresses seals to prevent gas leakage while allowing for adjustable positioning, ensuring optimal seal performance without the need for extensive machining, thus enhancing the reliability and retrofitting feasibility of valve assembly retention systems.
Implementation Method 1
using O-rings for sealing
Implementation Method 2
effectively compresses seals to prevent gas leakage
Data Source
AI summary
A system for retaining a valve assembly in a cavity formed in a cylinder body of a compressor includes a ring having a through-hole positioned adjacent to the cavity and a cover partially inserted inside a through-hole of the ring. The cover and the ring can slide relative to each other. The position of the cover relative to the cylinder body can be adjusted by tightening a cover retainer. The cover applies a downward force on the valve assembly via a cage. The downward force is used to compress a seal located between the valve assembly and the cylinder body. A seal is positioned between the ring and the cover. The seal remains squeezed when the cover and the ring slide relative to each other. The system can be used to convert a jackbolt cage-cover assembly and may not require significant machining of the cavity to provide a surface-finish with a suitable roughness for a sealing surface.