Pneumatic Jet Dosing Valve for Fast Closing of Viscous Liquids
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Solution Overview
Problem
Existing dosing valves face challenges in achieving rapid and precise dosing of highly viscous liquids due to limitations in closing speed and installation space, particularly when dealing with minute quantities, and require complex configurations and high process costs.
Innovation Solution
A dosing valve with a 5/2-way directional valve configuration, allowing simultaneous communication with multiple ports for rapid closing and single port communication for gentle opening, optimized for compact design and low complexity, utilizing a piston and valve tappet mechanism with adjustable pressurization and venting channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a conventional dosing valve configuration is used, then the valve can operate with simple structure, but the closing speed is insufficient for rapid dosing of viscous liquids
Solution Approach 1:
The patent implements dynamic control of the valve closing process by using a 5/2-way directional valve to switch between two communication configurations: initially connecting both sides of the piston to pressurized fluid for rapid closing, then switching to connect one side to pressurized fluid and the other to venting for controlled deceleration. This dynamic switching enables the valve to achieve high closing speeds for viscous liquids while maintaining control precision.
2Manufacturing precision
If the valve opening time is extended to allow viscous liquids to fill the nozzle-outlet channel, then complete liquid delivery is achieved, but surface-tension conditions change causing deflection and reduced dosing precision
Solution Approach 1:
The patent uses pneumatic pressure control through the 5/2-way directional valve to overcome the natural slow filling of viscous liquids. By applying pressurized fluid to both sides of the piston during the initial phase, the system forces rapid liquid delivery through the nozzle-outlet channel, achieving complete filling in minimal time while preventing surface-tension-induced deflection that would occur with prolonged opening times.
3Area of stationary object
If the valve is designed for compact installation, then installation space is reduced, but the mechanism for rapid closing and controlled opening becomes more complex
Solution Approach 1:
The patent combines multiple functions into the single 5/2-way directional valve, which simultaneously manages pressurization of both piston sides for rapid closing and subsequent controlled venting for gentle opening. This integration of multiple control functions into one switching component enables compact valve design with reduced installation space while achieving the complex rapid-closing/controlled-opening sequence through coordinated port switching.
4Speed
If high pressurization is applied to force rapid closing for viscous liquids, then closing speed increases, but air bubbles may be suctioned into the liquid during opening
Solution Approach 1:
The patent implements a two-stage periodic control sequence through the 5/2-way directional valve: first stage connects both piston sides to pressurized fluid for rapid closing, then switches to second stage where one side remains pressurized while the other connects to venting for controlled opening. This periodic switching of pressure conditions enables high closing speed while preventing air bubble suction during the gradual opening phase.
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 configuration enables rapid and forceful closing for viscous liquids while preventing air bubble suction during opening, achieving precise dosing with reduced installation space and complexity, suitable for contactless jet dosing of minute quantities.
Implementation Method 1
the liquid present between the valve-closing element and nozzle-outlet channel is accelerated strongly in the direction of the nozzle-sealing seat
Implementation Method 2
a working space of the dosing valve may optionally be vented or pressurized with a pressurized fluid
Implementation Method 3
a certain return flow of liquid—depending on speed of the lifting process and on viscosity of the liquid—then takes place from the nozzle-outlet channel into the dosing chamber. This suck-back effect decreases with increasing distance of the valve tappet from the nozzle-sealing seat
Implementation Method 4
the valve-closing element (actuated by the valve-actuating element or if necessary constructed in one piece therewith) may be preloaded by means of a spring
Data Source
AI summary
A dosing valve is provided for ejecting a liquid from a nozzle outlet channel. The dosing valve has a main body, a valve actuating element movable within the main body, and a valve closure element connected to or actuatable by the valve actuating element. The valve closure element is movable within a dosing chamber between an open position, in which it is lifted off from a nozzle sealing seat, and a closed position, in which it lies against the nozzle sealing seat. For the pneumatic activation of the dosing valve, a switching valve is provided by means of which a working chamber of the dosing valve can be selectively ventilated or charged with a pressurized fluid.