Plunger Pump Valve Seat Structure With Replaceable Wear Ring
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Solution Overview
Problem
The existing valve seats in plunger pumps are prone to wear and require frequent replacement due to prolonged contact with the valve body, and the replacement process is laborious because they are mounted in an interference fit manner.
Innovation Solution
The implementation of a wear-resistant ring made of materials like zirconium oxide, nickel-based tungsten carbide, or cobalt-based tungsten carbide, which is harder than the valve seat, and a stepless split valve seat design with two liner rings that are harder than the base, along with a buffer ring to facilitate assembly and reduce wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the valve seat is made harder to increase wear resistance, then the wear resistance is improved, but the assembly difficulty increases due to interference fit mounting
Solution Approach 1:
The valve seat is divided into two parts: a base valve seat and a separate wear-resistant ring. The wear-resistant ring is inserted into a groove on the valve seat base, allowing the hard wear-resistant material to be combined with easier assembly methods, thus resolving the contradiction between wear resistance and assembly difficulty.
Solution Approach 2:
The valve seat combines different materials: the base valve seat is made of a softer, more ductile material for ease of manufacturing and assembly, while the wear-resistant ring is made of a harder material (such as ceramic or hard alloy) for improved wear resistance. This composite structure resolves the contradiction by allowing each component to be optimized for its specific function.
2Productivity
If the valve seat is replaced frequently to maintain performance, then the pumping efficiency is maintained, but the maintenance time and labor cost increase
Solution Approach 1:
The wear-resistant ring is designed as a separate, extractable component that can be removed and replaced independently from the valve seat base. When wear occurs, only the wear-resistant ring needs to be replaced rather than the entire valve seat assembly, significantly reducing maintenance time and labor cost while maintaining pumping efficiency.
Solution Approach 2:
The wear-resistant ring is designed as a consumable component that can be discarded after wear and replaced with a new ring. The valve seat base is recovered and reused, reducing waste and maintenance time. This approach maintains pumping efficiency by replacing only the worn component rather than the entire assembly.
3Device complexity
If the valve seat structure is simplified to reduce manufacturing complexity, then the manufacturing cost is reduced, but the stress concentration and fracture risk increase
Solution Approach 1:
The valve seat base maintains a simple, uniform structure for ease of manufacturing, while the wear-resistant ring provides localized reinforcement at the high-wear contact area. This local quality enhancement allows the overall structure to remain simple while providing sufficient strength and fracture resistance where needed.
Data Source
AI summary
A valve assembly and a plunger pump are disclosed. In one example, the valve assembly includes a valve seat, a valve body, valve rubber, and a wear-resistant ring, where the valve seat is provided with a guide cavity, the valve body includes a guide claw and an attachment disc which are fixedly connected, the guide claw is in sliding fit with the guide cavity, the attachment disc is provided with a mounting groove, the valve rubber is embedded in the mounting groove, the wear-resistant ring is made of a wear-resistant material, hardness of the wear-resistant ring is greater than hardness of the valve seat, the wear-resistant ring and the valve seat are relatively fixed, and in a case that the valve assembly is in a closed state, the attachment disc and the valve rubber are both attached to a surface of the wear-resistant ring.