Recent Blogs
Lantern Bellows Dry Gas Meter
How a lantern bellows dry gas meter measures residential and commercial gas flow — internal mechanism, slide valves, sizing math, and field diagnostics.
Dry Gas Meter
Dry gas meter explained — diaphragm chambers, slide valves, and tangent linkage that meter natural gas flow to ±1% accuracy in residential and light commercial...
Single Eccentric Reversing Gear
Single Eccentric Reversing Gear explained — how Stephenson-era engineers reversed steam locomotives with one eccentric, slip-link, and gab hook. Diagrams, math, examples.
Stephenson Valve Gear
Stephenson valve gear explained — how the link motion controls steam admission, cutoff, and reverse on locomotives, with worked sizing example and tradeoffs.
Slide Valve
Slide valve mechanism explained — how a sliding port plate directs steam or fluid flow, with worked example, design tradeoffs, and named locomotive applications.
Valve Gear (form)
Valve gear controls steam admission and exhaust timing in reciprocating engines. Learn cut-off, lead, lap, and how Stephenson and Walschaerts gears work in service.
Steam Engine Valve Chest
Steam engine valve chest explained — how the slide valve admits and exhausts steam, port sizing, lap and lead, and worked examples from heritage marine...
Single Eccentric Variable Valve Throw
Single Eccentric Variable Valve Throw explained — how shifting one eccentric on a steam engine alters valve travel, cutoff, and power across operating range.
Single Eccentric Valve Gear
Single Eccentric Valve Gear explained — how it drives the slide valve on stationary steam engines, with formulas, worked example, and design tradeoffs.
Single D Slide Valve
Single D slide valve explained — how it ports steam to a cylinder, lap and lead settings, and worked timing examples for heritage steam locomotive...
Meyer Cut-off Valve
How the Meyer Cut-off Valve varies steam admission on stationary and marine engines — geometry, formulas, worked example and design tradeoffs explained.
Marshall Valve Gear
Marshall valve gear explained — how the radial linkage controls steam admission and cutoff on traction engines, with formula, worked example and design tradeoffs.
Joy's Hydraulic Shifting Eccentric
Joy's hydraulic shifting eccentric explained — how marine triple-expansion engines reverse without a separate eccentric, with worked example and design tradeoffs.
Gooch Valve Gear
Gooch valve gear explained — how Daniel Gooch's stationary-link reversing gear controls steam admission in locomotives, with formula, worked example and tradeoffs.
Double Slide Piston Rotary Engine
How the Double Slide Piston Rotary Engine works — geometry, port timing, and a worked example from a heritage workshop restoration. Diagrams, formulas, FAQs.
Bremme Valve Gear
Bremme valve gear explained — how this radial gear sets cutoff and reverse on marine and stationary steam engines, with worked example and design tradeoffs.
Allan Straight-link Valve Gear
Allan straight-link valve gear explained — how the symmetric link reverses steam locomotive valves, design math, tolerances, and worked example for restorers.