Drain Trap Valve Seat Rotation to Prevent Steam Leakage
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Solution Overview
Problem
Existing valve devices are prone to leakage due to foreign matter deposition on the valve body or seat, which hinders hermetic closure and leads to steam leakage.
Innovation Solution
A valve device with a movable and rotatable valve seat that can be displaced to scrape off foreign matter from its surface, ensuring proper closure and reducing fluid leakage, featuring a driving shaft, retention member, and a coupling pin for simultaneous back-and-forth movement and rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the valve body and valve seat are fixed in position, then the structure is simple and reliable, but foreign matter accumulates on the seat surfaces preventing hermetic closure and causing leakage
Solution Approach 1:
The valve seat is made movable relative to the valve body through a driving shaft mechanism. The valve seat can be displaced axially and rotated, transforming from a static component to a dynamic one. This allows the seat surfaces to be scraped clean of foreign matter during maintenance operations, ensuring hermetic closure when the valve is in service.
Solution Approach 2:
The valve seat can be preliminarily prepared by scraping its seat surface before actual valve operation. By displacing the valve seat axially and rotating it while in contact with the valve body, foreign matter is removed in advance, ensuring that when the valve operates, the seat surfaces are clean and capable of hermetic closure.
2Reliability
If the valve seat is made movable and rotatable to scrape off foreign matter, then leakage is prevented, but the device complexity increases with additional components like driving shaft and retention member
Solution Approach 1:
The driving shaft serves multiple functions: it transmits rotational motion to rotate the valve seat for scraping, and it also enables axial displacement of the valve seat. The retention member both holds the valve seat in position during operation and allows controlled movement during maintenance. This multi-functionality reduces the need for separate dedicated components for each function.
Solution Approach 2:
The functions of rotating the valve seat and displacing it axially are merged into a single integrated mechanism driven by the driving shaft. The retention member combines the functions of securing the valve seat during normal operation and facilitating its movement during maintenance. This merging reduces the overall number of separate components compared to having independent mechanisms for each function.
3Reliability
If foreign matter is allowed to accumulate on the valve seat, then the structure remains undisturbed, but the valve body cannot hermetically close the channel causing fluid leakage
Solution Approach 1:
The valve seat can be self-maintained by scraping its own seat surface against the valve body. During maintenance operations, the valve seat is displaced axially and rotated while in contact with the valve body, allowing it to scrape off accumulated foreign matter from its own seat surface and from the valve body surface, restoring hermetic closure capability without requiring external cleaning equipment.
Data Source
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AI summary
A drain trap 1 includes: a casing 10 having a fluid channel; and a second valve mechanism 40 including a second valve seat 52 having a seat surface 52a in a ring shape and a second valve body 42 configured to be displaced to be separated from and seated on the seat surface 52a of the second valve seat 52 so that and the second valve mechanism 40 opens and closes the channel. The second valve seat 52 is held to be movable back and forth along a center axis X of the ring shape such that the seat surface 52a of the second valve seat 52 and the seat surface 42a of the second valve body 42 are separated from each other and contact each other, and is held to be rotatable about the center axis X of the ring shape.