Old Steamers

Pumps, pressure, and machines that outlived their makers

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Check Valve One Way Valve Guide: Types, Selection & Use

A check valve, one-way valve, and usually non-return valve are synonymous general terms. Each describes a two-port valve—with an inlet and an outlet—that…

By Walt Brenner · 6 August 2026 · 24 min read

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VP44 Injection Pump: Why They Fail & How to Keep the Next One Alive

Why the Bosch VP44 injection pump on 1998–2002 Cummins diesels fails, the real warning signs, and the fuel-pressure fix that saves replacements.