Valve with stuffing box
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Solution Overview
Problem
Existing valve designs for heating or cooling systems face challenges in easy and secure mounting of the stuffing box, which affects the reliability and maintainability of the valve's fluid flow regulation.
Innovation Solution
A valve design featuring a movable valve pin within a stuffing box that acts as a linear guide, with a removable mounting element allowing easy exchange and secure attachment, including a radial stop and lubricant cavity for precise positioning and sealing, and a presetting element for adjustable flow resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the stuffing box is mounted with a simple one-sided stop, then the structure is kept simple and ease of operation is improved, but mounting security and reliability may be compromised
Solution Approach 1:
The mounting element is divided into a first portion with an internal thread and a second portion forming the stop. This segmentation allows the mounting element to provide both secure threaded attachment and simple stop-based positioning, resolving the contradiction between simple operation and secure mounting.
Solution Approach 2:
The mounting element acts as an intermediary component between the stuffing box and the valve body. It provides a threaded connection to the valve body while presenting a simple stop surface to the stuffing box, mediating between the need for secure attachment and ease of installation.
2Ease of repair
If a removable mounting element with thread-free connection is used, then ease of repair and maintainability are improved, but device complexity increases
Solution Approach 1:
The mounting element is segmented into removable portions, allowing the stuffing box to be easily detached and replaced. The first portion with internal thread remains with the valve body while the second portion can be removed with the stuffing box, facilitating maintenance while keeping the overall structure relatively simple.
Solution Approach 2:
The mounting element transitions from a static permanent connection to a dynamic removable connection. The threaded design allows the mounting element to be screwed in and out, providing ease of repair while maintaining a relatively simple structural form factor.
3Ease of operation
If the stop element can rotate relative to the stuffing box, then ease of operation during assembly is improved, but positioning precision may be affected
Solution Approach 1:
The stop is designed to engage the stuffing box in a preliminary positioning action before final tightening. The rotation capability allows for easy alignment during this preliminary stage, while the subsequent threaded engagement locks in the precise position, combining ease of assembly with positioning accuracy.
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
Enables easy and secure mounting of the stuffing box, precise fluid flow regulation, and maintains sealing even when the stuffing box is removed, facilitating maintenance without requiring adjustments to the presetting of the valve.
Implementation Method 1
the stuffing box may comprise a lubricant to retain movability of the valve pin
Data Source
Figure 1~3
Figure 4
Figure 5
AI summary
Valve (10) including a valve element (20) moveable relative to a valve seat (28) to adjust a valve opening (30) to regulate a fluid flow. A valve pin (24) is arranged to act on the valve element. The valve pin protrudes out of the valve and is arranged movable in a longitudinal direction (X) within a stuffing box (60). To easily and securely mount the stuffing box, said stuffing box is provided axially abutting against a stop element (85) secured by a removable mounting element (62).