Piston-Rod Venting Valve for Paint Leak Containment
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Solution Overview
Problem
Current valve systems for applying covering products, such as paint sprayers, face issues with damage due to dried paint residues plugging vents, leading to clogs and increased maintenance costs.
Innovation Solution
A valve design with a vent duct integrated into the piston rod, allowing leaks to be directed to the outside without requiring external vent channels, reducing the need for maintenance and preventing clogs within the application system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a vent is made through the body of the sprayer to direct paint leaks outside, then the valve leak detection function is improved, but the sprayer body becomes damaged and clogged by dried paint residues
Solution Approach 1:
The vent function is extracted from the sprayer body and relocated to the valve itself. The vent duct is now provided in the piston rod, communicating with the inner central orifice between the first and second sealing devices, and emerging in the open air or in part of the chamber communicating with the open air. This extraction eliminates the need for vent channels in the sprayer body, preventing paint residues from clogging the sprayer while maintaining leak detection capability.
Solution Approach 2:
The piston rod serves as an intermediary element that houses the vent duct. By routing the vent through the piston rod rather than through the sprayer body, the system mediates between the need for leak detection and the need to protect the sprayer body from damage. The vent duct in the piston rod acts as an intermediate pathway that directs leaks away from the sprayer body without requiring modifications to it.
2Object-generated harmful factors
If external vent channels are used in the sprayer body, then paint leaks can be directed outside, but maintenance operations increase due to clogs and damage
Solution Approach 1:
The venting functionality is extracted from the sprayer body and integrated into the valve assembly itself. The vent duct is now provided in the piston rod, allowing the valve to vent paint leaks independently without relying on the sprayer body structure. This extraction reduces maintenance operations on the sprayer body while maintaining effective leak containment and direction.
3Reliability
If vents are made in the sprayer body to protect the control circuit, then paint entry into the control circuit is prevented, but the sprayer body suffers from dried paint residues
Solution Approach 1:
The venting function is extracted from the sprayer body and relocated to the valve's piston rod. The vent duct in the piston rod provides a dedicated pathway for paint leaks to escape before they can reach the control circuit, while eliminating the need for vent channels in the sprayer body that would be susceptible to clogging by dried paint residues.
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 design minimizes damage and maintenance by containing leaks within the valve itself, reducing overall system costs and simplifying maintenance operations.
Implementation Method 1
a first sealing device formed by a dynamic seal housed in the body around the piston rod on one side of the valve where the piston rod extends outside the body
Implementation Method 2
a second sealing device formed by a dynamic seal housed in the body around the piston rod between the first sealing device and the chamber
Implementation Method 3
a vent duct provided in the rod of the piston and communicating with the inner central orifice between the first sealing device and the second sealing device and emerging in the open air or in part of the chamber communicating with the open air
Implementation Method 4
part of the chamber being intended to be filled with a pressurized control fluid so as to obtain the movement of the piston against the force of a spring housed in the body
Implementation Method 5
the movement of the piston against the force of a spring housed in the body
Data Source
AI summary
A valve including a body having an inner central orifice and a chamber, a piston formed by a rod and by a head mounted in the chamber, the rod extending outside the body and moving in a bore of an application system. The valve includes a first sealing device around the rod on one side of the valve where the rod extends outside the body, part of the chamber being filled with a pressurized control fluid to obtain movement of the piston against the force of a spring housed in the body. The valve includes a second sealing device around the rod, between the first sealing device and the chamber. The valve includes a vent duct in the rod that communicates with the inner central orifice between the first and second sealing devices and emerges in the open air or in part of the chamber communicating with the open air.