Check Valve With Sacrificial Member And Bayonet Fittings
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Solution Overview
Problem
Existing check valves for spray drying nozzles cause flow restrictions, are prone to pollution due to seal failures, and are difficult to maintain and clean, leading to inefficiencies and product contamination.
Innovation Solution
A check valve design with a sacrificial valve member and a removable valve seat, using a spring bias mechanism and bayonet fittings for easy assembly and disassembly, along with a guide mechanism to minimize flow obstruction and prevent contamination, allowing for efficient operation and maintenance without disturbing the valve.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional check valves are used to prevent liquid from falling as drops from nozzles, then product pollution is prevented, but flow restriction increases and pressure drop increases
Solution Approach 1:
The valve body is divided into two bore components with different diameters, creating a stepped configuration that forms a valve seat. This segmentation allows the valve member to seal effectively against the larger diameter seat while maintaining adequate flow area, resolving the contradiction between sealing reliability and flow capacity.
Solution Approach 2:
The valve member is designed with a curved end having specific geometric parameters (hemispherical or conical shape) that optimize both sealing contact with the valve seat and flow characteristics. The bias means spring force is calibrated to provide reliable sealing only when pressure drops below the predetermined minimum, allowing high flow rates during normal operation while preventing pollution during pressure drops.
2Reliability
If soft seals such as O-rings are used in check valves, then sealing is improved, but seal destruction occurs during use leading to product pollution
Solution Approach 1:
The valve member is designed as a sacrificial component with a curved end that can be replaced if worn. This disposable approach ensures reliable sealing during the component's service life without the risk of soft seal material degradation and contamination, as the sacrificial valve member can be easily replaced rather than repaired.
Solution Approach 2:
The valve assembly combines different materials strategically: the valve member uses sacrificial material for the sealing surface, while the valve body and other components use durable materials. This composite approach allows the soft seal function where needed while avoiding soft seals in positions where material degradation would cause contamination.
3Reliability
If complex valve designs with multiple seals are used, then sealing is improved, but device complexity increases and maintenance difficulty increases
Solution Approach 1:
The design extracts the essential sealing function to a single primary sealing point at the valve seat, eliminating the need for multiple seals and sealing points. The valve member's curved end provides the sealing interface, and the bias means provides the sealing force, simplifying the overall design while maintaining reliable sealing.
Solution Approach 2:
The valve member serves multiple functions: it provides the sealing surface against the valve seat, guides its own movement through the bore, and works with the bias means to provide automatic sealing. This multi-functionality reduces the need for separate components and simplifies the overall valve design.
4Reliability
If conventional check valves are used, then product pollution is prevented, but cleaning difficulty increases due to stagnant points
Solution Approach 1:
Instead of creating complex internal passages that provide sealing, the design inverts the approach by using a simple stepped bore configuration where the larger diameter second component provides adequate flow area and minimizes stagnant points. The sealing is achieved at the valve seat interface rather than through complex internal seal arrangements, making the valve easier to clean.
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 design ensures minimal pressure drop and prevents product pollution by maintaining a seal without soft seals, allowing for easy cleaning and maintenance, and facilitating the interchange of nozzles without affecting the check valve's operation.
Implementation Method 1
bias means to normally hold the member against the seat until the pressure at the inlet reaches a pre-determined minimum
Implementation Method 2
a valve member having a generally curved end directed towards the seat and bias means to normally hold the member against the seat
Data Source
AI summary
A check valve which includes a body adapted at one end to receive a liquid source and at the other end to engage with a spray nozzle and having a bore therethrough, an internal annular recess within the body, the upstream end of which body provides a valve seat, a valve assembly located in the recess and having a valve member having a generally curved end directed towards the seat and bias means to normally hold the member against the seat until the pressure at the inlet reaches a pre-determined minimum.