Poppet Valve with Titanium Nitride Coating for High-Pressure Water
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Solution Overview
Problem
Existing poppet valves used in turf and soil maintenance machines are not suitable for high-pressure water applications due to susceptibility to corrosion, leakage, and inability to operate at rapid cycling times and specific flow rates required for high-pressure water jets.
Innovation Solution
A poppet valve design featuring a housing, movable armature, pilot pin, return element, and a cage with precise tolerances and surface treatments, including titanium nitride coating, to regulate high-pressure water flow, with a reversible washer for adjustable flow rates, addressing the limitations of hydraulic oil type poppet valves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hydraulic oil type poppet valves are used, then the valves are well suited to controlling the flow of oil, but they are susceptible to corrosion from water and experience leakage due to insufficiently tight tolerances
Solution Approach 1:
The patent applies parameter changes by specifying tight tolerances (e.g., ±0.0005 inches for poppet outer diameter, ±0.001 inches for cage inner diameter) and material specifications (e.g., stainless steel 316 or 17-4 PH) to transform the valve from unsuitable for water service to highly reliable in high-pressure water applications
Solution Approach 2:
The patent employs composite materials by combining stainless steel or 17-4 PH materials with titanium nitride coating, creating a composite structure that provides both corrosion resistance and enhanced surface properties for reliable water service operation
2Reliability
If tight tolerances are used for high-pressure water applications, then leakage is prevented, but manufacturing complexity increases
Solution Approach 1:
The patent resolves this contradiction by establishing specific tolerance parameters (e.g., poppet outer diameter ±0.0005 inches, cage inner diameter ±0.001 inches) that balance leakage prevention with manufacturing feasibility, rather than using excessively tight tolerances
Solution Approach 2:
The patent extracts the sealing function into a dedicated poppet component with precise tolerances, separating the sealing requirement from the overall valve design to manage manufacturing complexity through focused precision on critical components
3Speed
If the valve is designed for rapid cycling times, then the valve can operate at high speeds, but wear and lifespan may be reduced
Solution Approach 1:
The patent applies composite materials (stainless steel/17-4 PH with titanium nitride coating) that provide both the hardness for wear resistance during rapid cycling and the toughness for long service life, resolving the contradiction between speed and lifespan
Solution Approach 2:
The patent applies local quality by using titanium nitride coating specifically on the poppet and cage surfaces that experience wear during rapid cycling, providing enhanced wear resistance exactly where needed while maintaining overall valve performance
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 enables reliable operation at high pressures and rapid cycling times without leakage, extending the valve's lifespan and adaptability to various flow rate requirements, specifically suited for high-pressure water applications in turf and soil maintenance machines.
Implementation Method 1
The poppet, cage, and pilot pin can be coated with a titanium nitride finish or nitrided through a nitrocarburizing process, which protects against corrosion, and increases wear resistance
Implementation Method 2
The armature can be actuated by a solenoid
Data Source
Figure 1
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AI summary
A poppet valve for controlling water flow is provided, the poppet valve includes a housing, a movable armature arranged within the housing, a pilot pin having first and second ends, and a return element associated with the pilot pin. The first end of the pilot pin is associated with and driven by the armature, and a poppet is arranged around the second end of the pilot pin. A cage is arranged around the poppet, the cage having a transverse opening adapted for water to flow therethrough. The armature is selectively actuated to drive the pilot pin in a first direction towards a closed position, in which the transverse opening of the cage is blocked by the poppet. The return element drives the pilot pin in a second direction towards an open position, in which the transverse opening of the cage is unblocked by the poppet.