Pump Valve Retainer Reducing Bore Stress
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Solution Overview
Problem
Prior art plunger pumps experience reduced serviceable life due to stress concentrations in the suction bore caused by traditional valve retainers, which can lead to damage and erosion.
Innovation Solution
A novel valve retainer design featuring a retainer head with peripheral grooves that engage radial protrusions in the fluid bore, preventing rotation and reducing stress concentrations, and incorporating an elastomeric cover to prevent metal-to-metal contact and erosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional valve retainers with grooves in the suction bore are used, then the valve member is secured within the bore, but stress concentrations are created that reduce pump service life
Solution Approach 1:
The invention extracts the retention function from the suction bore itself by introducing a separate valve retainer component. The retainer head engages with radial protrusions on the inner surface of the suction bore, while the retention grooves are formed on the retainer head rather than directly in the bore. This separates the stress-concentrating grooves from the bore, eliminating the harmful stress concentrations while maintaining valve member retention.
Solution Approach 2:
The valve retainer acts as an intermediary component between the suction bore and the valve member. The retainer head with its engagement grooves provides the retention function, while the retainer hub provides structural support and positioning. This intermediary structure allows the bore to remain smooth and stress-free while still achieving secure valve member retention through the retainer's engagement features.
2Reliability
If radial protrusions are added to the suction bore for retainer engagement, then the retainer is securely positioned, but erosion of the protrusions may occur during extended use
Solution Approach 1:
The invention applies a flexible elastomeric material as a protective film or coating on the radial protrusions of the suction bore. This elastomeric layer absorbs the wear and erosion that would otherwise affect the metal protrusions, while still providing sufficient friction and mechanical engagement to securely position the retainer head. The flexible material deforms slightly during operation to accommodate the engagement grooves while protecting the underlying protrusion structure.
3Ease of repair
If the retainer hub is made separate from the valve member, then the valve can be serviced independently, but the assembly complexity increases
Solution Approach 1:
The invention segments the valve assembly into distinct functional components: the valve member for fluid control, the retainer hub for structural support and positioning, and the retainer head for engagement and retention. This segmentation allows the valve member to be independently serviced by removing only the retainer head, while the retainer hub remains attached to or integrated with the pump structure. The modular design simplifies maintenance while the integrated hub reduces overall assembly complexity.
Data Source
AI summary
A retainer for movably securing a valve member within a fluid bore of a pump comprises a retainer head which includes at least one peripheral groove and a retainer hub which is connected to or formed integrally with the retainer head. The valve member is movably coupled to the retainer hub, and the retainer head is movable to position the groove over a radial protrusion in the fluid bore. In this position, the retainer is secured to the pump and the valve member is accordingly movably secured within the fluid bore.