Piston Pressure Regulating Valve With Return Flow Leak Control
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Solution Overview
Problem
Existing pressure regulating valves face challenges in effectively preventing leakage of working liquid, especially under high pressure conditions, and require multiple seal members which can be costly and prone to frequent replacement.
Innovation Solution
The pressure regulating valve incorporates a metal seal structure with tapered surfaces and integrated return flow paths to manage leakage, utilizing a piston valve body that closes or opens based on pressure thresholds, and includes multiple seals to direct leaked liquid back into a surplus discharge path, reducing external leakage and seal wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple seal members are used to prevent leakage, then leakage prevention is improved, but device complexity and cost increase
Solution Approach 1:
The patent combines multiple sealing functions into a single integrated valve seat assembly. The valve seat assembly includes a body seat, valve seat, and return flow path integrated into one component structure, eliminating the need for separate seal members between these components. This merging reduces complexity while maintaining reliable sealing through the integrated design.
Solution Approach 2:
The return flow path acts as an intermediary mechanism that captures leaked working liquid before it escapes externally. By providing a dedicated return flow path that directs leaked liquid back to the surplus liquid discharge path, the system prevents external leakage without requiring additional seal members, thus resolving the contradiction between reliability and complexity.
2Reliability
If multiple seal members are used to prevent leakage, then leakage prevention is improved, but maintenance cost and replacement frequency worsen
Solution Approach 1:
By integrating the body seat, valve seat, and return flow path into a single valve seat assembly, the patent reduces the number of replaceable seal members. Fewer separate components mean fewer seals that can fail and require replacement, directly improving ease of repair and reducing maintenance costs while maintaining reliable leakage prevention.
Solution Approach 2:
The return flow path enables the system to self-correct minor sealing issues by directing leaked liquid back into the discharge path. This self-service mechanism reduces the frequency of seal failures and extends seal life, decreasing maintenance requirements without compromising leakage prevention.
3Device complexity
If a simple seal structure is used, then device complexity is reduced, but leakage prevention under high pressure deteriorates
Solution Approach 1:
The return flow path serves as an intermediary safety mechanism that captures and redirects leaked liquid under high pressure conditions. This allows the use of a relatively simple seal structure while maintaining reliable leakage prevention, as the return flow path acts as a backup to handle any leaks that occur under high pressure.
Solution Approach 2:
The patent converts the harmful effect of leakage under high pressure into a beneficial outcome by directing the leaked liquid through the return flow path back to the discharge path. This approach allows for simpler seal structures while maintaining reliability, as any leakage is captured and redirected rather than causing external contamination.
4Reliability
If additional seal members are added to prevent leakage, then leakage prevention is improved, but manufacturing cost increases
Solution Approach 1:
The integrated valve seat assembly combines multiple sealing functions into a single manufactured component. This merging reduces the total number of parts that need to be manufactured, assembled, and sealed, thereby reducing manufacturing cost while maintaining reliable leakage prevention through the integrated design.
Solution Approach 2:
The return flow path provides a cost-effective intermediary solution that prevents external leakage without requiring additional expensive seal members. By capturing and redirecting leaked liquid, the system achieves reliable leakage prevention through a single integrated structure rather than multiple costly seal components.
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 effectively suppresses external leakage of working liquid, extends seal life, and allows for efficient pressure regulation of high-pressure fluids without the need for additional seal members, thereby reducing maintenance and operational costs.
Implementation Method 1
The valve seat seal may have a metal seal structure in which the inner peripheral surface of the attachment hole of the body and the outer peripheral surface of the valve seat assembly are brought into surface contact with each other
Implementation Method 2
the return flow path fluidly connects an inside of the attachment hole and the surplus liquid discharge path
Implementation Method 3
the piston valve body is configured to sit on the valve seat assembly to close an opening of the surplus liquid discharge path when the pressure of the working liquid is equal to or lower than a set pressure and separate from the valve seat assembly to open the opening when the pressure of the working liquid exceeds the set pressure
Data Source
AI summary
A pressure regulating valve includes a body having a pressure regulating chamber into which a working liquid flows and an attachment hole fluidly coupling with the pressure regulating chamber, a valve seat assembly fitted in the attachment hole, wherein the valve seat assembly includes a surplus liquid discharge path fluidly coupled with the pressure regulating chamber, a piston configured to open and close an opening of the surplus liquid discharge path in the pressure regulating chamber, a valve seat seal forming a seal between the valve seat assembly and the body in the attachment hole in a liquid-tight manner and a return flow path fluidly coupling an inside of the attachment hole to the surplus liquid discharge path. Wherein the valve seat seal is located between the return flow path and the pressure regulating chamber.