Valve Body Truncated Cone Design for High-Pressure Oscillation
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Solution Overview
Problem
Globe valves experience self-excited oscillation at high pressure fluid conditions, leading to potential seat damage and leakage when the difference between primary and secondary side pressures exceeds 50 MPa or primary side pressure exceeds 70 MPa, as seen in advanced applications like fuel cell technology.
Innovation Solution
A valve design featuring a seat surface angle of 30 to 60 degrees and a valve body configuration that prevents the tip part from contacting the seat surface during oscillation, utilizing a truncated cone or cone shape with specific radius relationships to reduce differential pressure near the stem, thereby preventing seat damage and leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional globe valve structure is used, then the valve can be fully opened and closed with simple structure, but self-excited oscillation occurs at high pressure causing seat damage and leakage
Solution Approach 1:
The invention changes the geometric parameters of the valve body by introducing a truncated cone or cone shape with specific radius relationships. The radius at the tip part is set to 0.05 to 0.2 times the radius of the flow path, creating a specific pressure distribution that prevents self-excited oscillation and protects the seat from damage under high pressure conditions.
2Reliability
If the valve body moves closer to the seat during closing operation, then the valve can seal effectively, but fluid passing through the gap increases flow rate causing pulsation and self-excited oscillation
Solution Approach 1:
The invention modifies the geometric parameters of the valve body by introducing a truncated cone or cone shape with specific radius relationships. The radius at the tip part is set to 0.05 to 0.2 times the radius of the flow path, creating a specific pressure distribution that prevents self-excited oscillation and protects the seat from damage under high pressure conditions.
3Adaptability or versatility
If high pressure fluid conditions are used (difference between primary and secondary side pressures exceeds 50 MPa or primary side pressure exceeds 70 MPa), then the valve can serve advanced applications like fuel cell technology, but stem oscillation occurs causing tip part contact with seat surface and seat damage
Solution Approach 1:
The invention changes the geometric parameters of the valve body by introducing a truncated cone or cone shape with specific radius relationships. The radius at the tip part is set to 0.05 to 0.2 times the radius of the flow path, creating a specific pressure distribution that prevents self-excited oscillation and protects the seat from damage under high pressure conditions.
Data Source
Figure 1
Figure 2
Figure 2A
AI summary
A valve in a simple configuration that prevents the seat from being damaged by self-excited oscillation of the valve body and thus prevents seat leakage can be provided, the valve comprising: a valve casing having a fluid inlet, a fluid outlet, and a valve chamber; a seat provided in the valve chamber and having a seat surface; a stem inserted into the valve casing so that the stem can be vertically movable; and a valve body arranged at a tip of the stem and capable of abutting on the seat surface of the seat due to the vertical movement of the stem, a tip part of the valve body does not come into contact with the seat surface when oscillation occurs in the stem.