Double Seat Valve Flow Divider for Leakage Prevention
Solution Overview
Problem
Double seat valves face challenges in preventing leakage of cleaning agents onto the sealing valve disc, which can contaminate products and fail to ensure thorough cleaning, especially under conditions requiring negative pressure during the cleaning process.
Innovation Solution
The implementation of a flow divider that creates a measurable negative pressure in the leakage room by dividing the cleaning medium flow into two parts, ensuring no leakage through the sealing seal and allowing thorough cleaning in all lift positions, with a design that includes a pressure jet pump suction effect and a deflecting shoulder to direct side flows away from the sealing seal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the cleaning medium is led directly onto the valve disc seal with high pressure, then cleaning effectiveness is improved, but leakage risk increases and product contamination occurs
Solution Approach 1:
The cleaning medium flow is divided into two separate channels: a first channel that directs cleaning medium onto the valve disc seal for effective cleaning, and a second channel that prevents direct impingement on the seal. This segmentation allows the system to achieve both thorough cleaning and leakage prevention simultaneously.
Solution Approach 2:
A deflector element is introduced as an intermediary component between the cleaning medium source and the valve disc seal. The deflector guides the cleaning medium flow along the seal surface without allowing direct high-pressure impingement, thereby maintaining cleaning effectiveness while preventing leakage and contamination.
2Reliability
If the deflector is equipped with a radial seal to maintain sealing contact, then sealing performance is improved, but cleaning effectiveness in the radial seal area deteriorates
Solution Approach 1:
The radial seal is removed from the deflector component entirely. Instead, sealing is achieved through the interaction between the valve disc and seat, allowing the deflector to focus solely on guiding the cleaning medium flow without compromising cleaning effectiveness in the radial seal area.
Solution Approach 2:
The deflector is designed to move axially with the valve disc during operation, maintaining its functional relationship with the cleaning medium flow paths while allowing cleaning medium to access all necessary surfaces including areas where a fixed radial seal would have prevented cleaning.
3Reliability
If the cleaning medium is throttled before entering the leakage room, then direct impingement on the seal is reduced, but complete cleaning of the leakage room becomes difficult
Solution Approach 1:
Different flow conditions are provided in different regions of the leakage room. The first channel provides high-pressure direct impingement specifically on the valve disc seal for effective cleaning, while the second channel provides throttled flow that prevents leakage without compromising overall cleaning completeness.
Solution Approach 2:
The cleaning medium is introduced into the leakage room from multiple directions and positions through separate channels, allowing thorough cleaning of all surfaces including the valve disc seal and surrounding areas, while controlling the flow characteristics to prevent leakage.
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
This solution effectively prevents cleaning medium leakage into the product line while ensuring complete cleaning of the leakage room in both lift positions, meeting the requirements of maintaining negative pressure and preventing contamination, thus enhancing the operational reliability and compliance with industry standards.
Implementation Method 1
a pressure jet pump suction effect results from the cleaning medium flow in each lift position that creates a measurable negative pressure in the part of the leakage room
Implementation Method 2
the cleaning medium that flows in under pressure is led through a circumferential throttle gap before it flows through the first channels. Out of the first channels, the cleaning medium shoots into the lower part of the leakage room where it impinges on the seal of the lower valve disc with considerable pressure
Data Source
AI summary
In a double seat valve with upper and lower valve discs and a flow divider in a leakage room, wherein respectively one valve disc can be set to a lift position to supplying a cleaning medium flow into the leakage room, and first channels are provided in the flow divider and second channels in the lower valve disc towards a leakage outlet, the first channels are disposed in extensions of the flow divider that axially bridge the lower leakage room part and that join within the second channels the flow divider forming in at least one of two lift positions with its external circumference with the external wall of the leakage room a leakage gap for a side flow that is significantly smaller than a main flow that is deflected and directed by the flow divider into the first channels or into the second channels and to the leakage outlet.