Pleated Filter for Pneumatic Butterfly Valve
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Solution Overview
Problem
Conventional filters for pneumatically actuated butterfly valves face limitations in filtration capacity and micron rating, especially at small diameters, leading to reduced effectiveness and potential bypass of particles when clogged, due to their mesh or screen configurations.
Innovation Solution
A filter assembly with a pleated filter media housed in a cylindrical configuration, featuring a larger filter diameter and perforations, which increases filtration capacity and durability, and incorporates seals to prevent bypass and lifting when clogged.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If mesh or screen filters are used in small diameter configurations, then space is saved, but filtration capacity is limited
Solution Approach 1:
The filter media is folded or pleated into a compact configuration that nests within the small diameter filter housing, increasing the effective filtration surface area without increasing the external dimensions of the filter assembly
Solution Approach 2:
The filter media is arranged in a three-dimensional pleated structure rather than a flat two-dimensional screen, utilizing the radial and axial dimensions to maximize filtration surface area within the constrained cylindrical space
2Measurement precision
If smaller hole sizes are used in mesh filters, then filtration precision improves, but filter clogging time increases
Solution Approach 1:
The filter media structure is changed from a flat screen to a pleated configuration, which alters the flow dynamics and distribution across the filtration surface, delaying clogging while maintaining fine micron ratings
3Reliability
If mesh filters are held by spring load, then filter is secured in place, but particles bypass when filter clogs and lifts
Solution Approach 1:
The spring loading mechanism is removed entirely and replaced with a friction-fit retention system where the filter assembly is held in place by dimensional interference and sealing surfaces, eliminating the mechanism that allows filter lift and particle bypass
Solution Approach 2:
Sealing elements or O-rings are introduced as intermediary components between the filter assembly and housing to create a pressure-tight seal that prevents particle bypass while maintaining secure filter retention
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
The solution enhances filtration capacity and durability, allowing for a lower micron rating and extended filter life, while preventing axial plugging and bypass of contaminants, thus improving valve performance and reducing downtime.
Implementation Method 1
A filter assembly with a pleated filter media housed in a cylindrical configuration
Implementation Method 2
incorporates seals to prevent bypass and lifting when clogged
Data Source
AI summary
An example embodiment of a filter for a butterfly valve includes an inlet side having an axial inlet port and the first diameter Din, a closed outer side having a second diameter D2, and a filter body disposed between the inlet side and the outer side. The filter body has a filter diameter Dfilter larger than both Din and D2, and includes a cylindrical wall retaining a pleated filter media. A plurality of perforations is formed through a main bore wall to serve as at least one exit for the filter.