Modular Pump Fluid End Housing with In-Line Valves
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Solution Overview
Problem
High-pressure plunger pumps in oil field operations face issues with flow restrictions, premature seal failure, and structural fatigue due to large valve and seat sizes, as well as inefficiencies in fluid energy transfer and stress concentrations at bore intersections, which lead to cyclic fatigue and maintenance complications.
Innovation Solution
A modular fluid end design with a central fluid module and multiple suction seat modules, featuring an in-line configuration of bores to reduce stress and improve maintenance access, along with a reduced discharge port size and frusto-conical transition volume to minimize stress and fluid energy loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If large valve and seat sizes are used to reduce flow restrictions, then fluid flow and chamber filling are improved, but valve seal erosion and premature seal failure increase due to higher fluid velocity
Solution Approach 1:
The patent changes the geometric parameters of the valve and seat, specifically using a smaller seat diameter relative to the valve diameter compared to conventional designs. This parameter change allows the valve to maintain adequate flow area while reducing the velocity at the seat interface, thereby reducing erosion and extending seal life
Solution Approach 2:
The patent applies different quality requirements to different parts of the valve system. The valve body is designed with sufficient flow area for productivity, while the seat area is optimized for reduced velocity and erosion resistance. This local differentiation allows simultaneous optimization of flow and durability
2Productivity
If large valve and seat sizes are used to improve flow, then chamber filling is enhanced, but fluid end housing weight and size increase
Solution Approach 1:
The patent optimizes the valve and seat dimensional parameters to achieve adequate flow with smaller overall dimensions. By carefully selecting the valve diameter, seat diameter, and flow area ratios, the design maintains productivity while reducing the housing size and weight required to contain the valve assembly
3Productivity
If large valve and seat sizes are used to reduce flow restrictions, then fluid energy is improved, but structural stresses on fluid end housing increase leading to premature failure
Solution Approach 1:
The patent changes the structural parameters of the fluid end housing, including wall thickness, bore intersection geometry, and support rib placement. These parameter changes allow the housing to withstand the stresses generated by adequate valve sizing while preventing premature structural failure
4Strength
If traditional fluid end design with intersecting bores is used to accommodate valves, then structural support is provided, but stress concentrations at bore intersections cause cyclic fatigue
Solution Approach 1:
The patent replaces the traditional sharp intersecting bore geometry with curved, filleted transitions between bores. This curvature eliminates stress concentration points at bore intersections, significantly reducing cyclic fatigue and extending the service life of the fluid end housing while maintaining structural support
5Ease of repair
If modular design with separated suction seat modules is used to improve maintenance accessibility, then ease of repair is enhanced, but device complexity increases
Solution Approach 1:
The patent divides the fluid end housing into modular segments, specifically making the suction seat modules separable from the main housing. This segmentation allows individual modules to be removed and replaced during maintenance without disassembling the entire pump, significantly improving ease of repair while the modularity itself manages the complexity through standardization
Data Source
AI summary
A plunger pump fluid end assembly design in which the suction valve and seat is aligned with the plunger and the fluid end housing is constructed with multiple modules. Modules are held in a rigid assembly by staybolts that connect to the power end of the plunger pump. Said staybolts pass though bores in the central fluid module and the suction seat module and bound by a conventional threaded nut. Packing box modules are bound to the central fluid module by bolts that also pass through separate bores in the same central module. A suction valve spring retainer/plunger spacer within the plunger bore of the assembly shields the intersection of the plunger bore and the discharge bore from destructive erosion damage.