Pumps, pressure, and machines that outlived their makers
Aeration Pump Sizing and Selection
Calculate target CFM and backpressure from depth, line and diffuser losses, then verify airflow on the exact model’s performance curve.
By Walt Brenner · 7 September 2026 · 16 min readLatest
Back Pressure Regulator Valve: Operation & Selection
Maps the fluid, flow, inlet and outlet pressure, temperature, materials and discharge data needed for preliminary selection.
How to Choose a Square D Pressure Switch
Compare PSI candidates, then match the full catalog number, motor voltage, phase, horsepower, contacts, port, enclosure, mounting, and control feature.
Alternating Relays: How They Work and How to Choose
Use a sequence-first method, then compare control voltage, inputs, contacts, starter interfaces, pinouts, sockets, timing, mounting, and approvals.
Gear Coupling Types, Selection and Maintenance
Compare full-flex, flex-rigid, spacer and sliding designs, then verify torque, speed, bore, alignment, lubrication and installation requirements.
Selecting a DN15 Stainless Steel Ball Valve
Match DN15/1/2-inch connections, bore or Kv, wetted materials, pressure-temperature limits, dimensions, and actuation with a supplier checklist.
DN25 Check Valve Selection: Sizing and Compatibility
Evaluate fluid, contaminants, flow range, pressure-temperature limits, pressure loss, connections, orientation, leakage and surge before purchase.
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Water Well Installation: Process, Costs & Planning
Explains how a potable well is sited, approved, drilled, connected and tested for pressure, household demand, contamination risks and water quality.
External Gear Pump: Operation, Sizing & Selection
Calculate displacement from flow, speed and efficiency, then check pressure, viscosity, inlet conditions, compatibility and performance curves.
Hydraulic Pump for Log Splitter: Sizing
Use GPM-to-horsepower ranges to narrow options, then verify stage flows, RPM, rotation, shaft, mount, ports, dimensions, and pressure ratings.
Septic System Air Pump: Sizing and Replacement
Match airflow at operating pressure, then verify power, tubing, controls, alarms and system approval before buying a replacement.
Insulated Pump House: How to Choose
Work backward from equipment, winter conditions, maintenance paths, moisture and failure risks; compare usable dimensions and total installed cost.
Arizona Pool Pump Off-Peak Savings Before an Upgrade
Compare APS and SRP pump schedules, calculate time-of-use savings, and see whether retiming should come before a variable-speed replacement.
Audi EA839 Water Pump Lawsuit: Quote Spread and TSBs
Compare Audi EA839 water-pump quotes, review models named in Larr v. Audi, and see what the reported bulletins and proposed lawsuit establish.
How to Choose a Ball Non-Return Valve
Match flow and differential pressure to orientation, wetted materials and connections, then verify installation requirements and troubleshoot by symptom.
Jeep Wrangler Power Steering Pump Recall: What Gets Fixed
Check whether a 2021–2025 Wrangler, Gladiator, or 4xe is in the recall range, what dealers replace, and why parking outside beats a pump swap.
Well Water Air Injector Pros and Cons: When It Fits
See when it suits compatible iron or sulfur, plus how water chemistry, pump and drain capacity, backwash, noise and maintenance affect the choice.
Reducer Bushings: Types, Sizes, Selection & Installation Guide
A reducer bushing is a compact fitting used to connect pipes, fittings, or equipment ports of different nominal sizes. Selecting one correctly requires more…
Voltage Sensitive Relay: How It Works and When to Use One
A voltage sensitive relay can make a dual-battery system seem simple: start the engine, charge both batteries, stop the engine, and isolate the starter…