Valve Plug Assembly With Universal Sealing Disk Fastening
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Solution Overview
Problem
Existing valve plug assemblies for fluid control devices require different retainers and fasteners for machined and molded sealing disks, complicating servicing and necessitating additional components like o-rings, which increases complexity and part requirements.
Innovation Solution
A valve plug assembly with a cylindrical body and annular flange featuring interchangeable bores and recesses that accommodate both machined and molded sealing disks, allowing the same fasteners to secure the valve plug to a mounting portion without a retainer, and includes a gasket to reduce vibrations in high-pressure applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If different retainers and fasteners are used for machined and molded sealing disks, then the sealing disks can be securely attached, but the servicing complexity increases and part requirements multiply
Solution Approach 1:
The valve plug is designed with a universal attachment structure featuring a recess that can accommodate both machined sealing disks and molded sealing disks using the same retainer and fastener configuration. This eliminates the need for different retainers and fasteners for different sealing disk types, reducing part variety while maintaining secure attachment for both disk types.
2Reliability
If additional o-rings or sealing mechanisms are included for machined sealing disks, then sealing is improved, but the number of parts and installation complexity increases
Solution Approach 1:
The sealing function is integrated directly into the valve plug body through a precision-machined sealing surface that forms part of the plug's inherent structure. This eliminates the need for separate o-rings or additional sealing mechanisms, as the sealing capability is merged into the plug itself, reducing part count while maintaining effective sealing.
3Ease of operation
If screw heads are positioned within the flow path, then the valve plug can be easily secured, but flow stability and pressure regulation are compromised
Solution Approach 1:
The fastening structure is designed so that screw heads are positioned in a recess on the outer surface of the valve plug, perpendicular to the flow path direction. This dimensional relocation removes the screw heads from the flow path while maintaining secure attachment, thereby preserving flow stability and pressure regulation performance.
Data Source
Figure 1~2
Figure 3
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AI summary
A valve plug (240) adapted for sealing engagement with a seat ring. The valve plug includes a cylindrical body (242) with an annular flange (246) having a groove (250). A pair of bores (252) is disposed in the body, each bore having a first diameter, a first end (254), and a second end (258) disposed within the body. Each bore is also adapted to receive a fastener (259) to couple the valve plug to a mounting portion (256), and a recess (260) is disposed at the second end of the bore, forming a stepped portion. The recess is adapted to receive at least one of a portion of a retainer or a portion of the fastener. A sealing disk (268) is disposed within the groove of the annular flange and is one of a machined sealing disk or a molded sealing disk.