Multi-Piece Pump Valve Insert for Strike Surface Wear
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Solution Overview
Problem
High pressure reciprocating pumps experience component failures, particularly erosion of the valve strike surface, leading to leakage and reduced pressure and flow capabilities due to the high forces exerted during earth drilling operations.
Innovation Solution
A multi-piece valve component construction featuring a carbide or ceramic insert as the strike surface, combined with a leg assembly and sealing element, which is designed to be removably coupled to the valve body, providing enhanced durability and resistance to abrasive wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional valve strike surface is used in high pressure reciprocating pumps, then the valve can be constructed with simpler materials and manufacturing processes, but the strike surface experiences rapid erosion and wearing due to high forces, leading to leakage and reduced pump capabilities
Solution Approach 1:
The valve is divided into multiple separable components: a valve body, a leg assembly, and an insert. The insert is the segment that directly contacts the valve seat and experiences wear, while the valve body and leg assembly provide structural support. This segmentation allows the wear-prone insert to be replaced independently without replacing the entire valve, resolving the contradiction between durability and construction complexity.
Solution Approach 2:
The valve combines different materials with complementary properties: the valve body and leg assembly are made from durable structural materials, while the insert is made from erosion-resistant materials such as carbide or ceramic. This composite construction allows each component to be optimized for its specific function, achieving high reliability without excessive overall complexity.
2Reliability
If the entire valve is replaced when the strike surface wears, then leakage and reduced pump capabilities are resolved, but maintenance time and costs increase significantly
Solution Approach 1:
The valve is segmented into replaceable components, specifically the insert that forms the strike surface. When erosion occurs, only the insert needs to be replaced rather than the entire valve assembly. This segmentation directly reduces maintenance downtime and costs while maintaining the sealing capability, as the insert can be quickly swapped out and the valve returned to service.
Solution Approach 2:
The design allows the worn insert to be discarded and replaced with a new one, while the valuable valve body and leg assembly are retained and reused. This selective replacement strategy minimizes waste and reduces maintenance time compared to replacing the entire valve, directly addressing the contradiction between reliability restoration and time loss.
3Strength
If harder materials like carbide or ceramic are used for the strike surface, then resistance to abrasive wear and erosion is significantly improved, but the overall valve component complexity and manufacturing difficulty increase
Solution Approach 1:
The valve is segmented so that only the insert, which requires the hard carbide or ceramic material for wear resistance, is manufactured from these difficult-to-process materials. The valve body and leg assembly can be manufactured from more easily fabricated materials using conventional processes. This segmentation isolates the manufacturing complexity to only the necessary component, making the overall valve easier to manufacture while maintaining high wear resistance where needed.
Solution Approach 2:
The hard carbide or ceramic material is applied locally only to the insert that contacts the valve seat and experiences wear, rather than making the entire valve from these difficult-to-manufacture materials. This local quality approach provides the necessary wear resistance at the critical interface while keeping the rest of the valve structure simple and easy to manufacture, resolving the contradiction between strength and ease of manufacture.
Data Source
AI summary
A valve component utilized in a fluid end assembly of a reciprocating pump may contain a multi-piece construction. The valve component may include a valve body portion, a leg assembly portion, a sealing element, and an insert at least partially captured between the valve body portion and the leg assembly portion. The insert may be constructed from a carbide or a ceramic material, and, when the valve component is fully assembled, may be compressed between the valve body portion and the leg assembly portion. The insert may at least partially form the strike surface of the valve component. The valve body portion and the leg assembly portion may both be constructed from a metallic material, and the valve body portion may define a sealing seat. The sealing element may be constructed from an elastomeric material that may be pre-formed and then compression molded onto the seat of the valve body.