Reciprocating Pump Valve Geometry for Load-Balanced Sealing
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Solution Overview
Problem
Reciprocating pump assemblies experience high loads and frequencies, leading to wear and damage of inlet and outlet valve seats and corresponding valve members due to concentrated cyclic loads, resulting in fatigue and potential failure.
Innovation Solution
A valve member design featuring a valve body with frusto-conical surfaces and a seal with a tapered, circumferentially-extending surface that engages the valve seat, including an annular bulbous protrusion and channel, and an annular groove with an annular element, to distribute loads and reduce stress concentrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional valve members with simple geometric shapes are used, then the device complexity is low and ease of manufacture is high, but stress concentrations occur at sharp corners leading to fatigue failure
Solution Approach 1:
The patent applies curvature by replacing sharp corners with rounded transitions. Specifically, the valve member includes a rounded transition between the stem and the valve face, and a rounded transition between the valve face and the seat. This curvature eliminates stress concentration points that would otherwise occur at sharp geometric transitions, thereby improving fatigue resistance while maintaining manufacturing feasibility through standard machining or molding processes.
2Power
If concentrated cyclic loads are applied to valve seats and valve members, then the pump operates at high power and productivity, but wear and damage occur leading to reduced reliability
Solution Approach 1:
The patent implements preliminary action through the retention groove feature. The groove is positioned to engage with a corresponding feature on the valve seat before the valve closes, pre-loading the valve assembly and ensuring proper alignment. This preliminary engagement distributes the cyclic loads more evenly across the valve components, reducing stress concentrations and wear that would otherwise occur during high-power operation, thereby improving reliability.
3Reliability
If simple valve member designs are used, then ease of manufacture is high, but sealing performance is insufficient under high load conditions
Solution Approach 1:
The patent applies local quality by providing reinforcement features at specific critical locations rather than throughout the entire valve member. The retention groove and rounded transitions are localized features placed precisely where stress concentrations and sealing requirements are most critical. This allows the valve member to be manufactured using standard processes for the bulk material, while adding localized complexity only where needed to improve sealing performance under high load conditions.
Data Source
AI summary
A valve member for an inlet or outlet valve assembly of a reciprocating pump assembly includes a valve body and a seal member. The valve body comprises a first body surface and a second body surface that extend circumferentially about the valve body. The valve body defines a body axis and an annular cavity. The seal member is positioned at least partially within the annular cavity of the valve body such that an outer seal portion of the seal member extends between the first body surface and the second body surface of the valve body. The outer seal portion of the seal member comprises a first seal surface and a second seal surface. The first body surface, the first seal surface, and the second seal surface extend at different angles relative to the body axis.