Southern valve gear was briefly popular on steam locomotives in the United States. It combines elements of the Walschaerts and Baker patterns. Southern...

The valve gear of a steam engine is the mechanism that operates the inlet and exhaust valves to admit steam into the cylinder and allow exhaust steam to...

Baker valve gear was the main competitor to Walschaerts valve gear for steam locomotives in the United States. Strictly speaking it was not a valve gear but...

The Hackworth valve gear is a design of valve gear used to regulate the flow of steam to the pistons in steam engines. It is a radial gear, with an actuating...

The Gresley conjugated valve gear is a valve gear for steam locomotives designed by Sir Nigel Gresley, chief mechanical engineer of the LNER, assisted...

Gab valve gear was an early form of valve gear used on steam engines. Its simplest form allowed an engine to be stopped and started. A double form, mostly...

The Holcroft valve gear was a type of conjugated valve gear designed and patented by Harold Holcroft and used on three-cylinder steam locomotives of the...

The Bulleid chain-driven valve gear is a type of steam locomotive valve gear designed by Oliver Bulleid during the Second World War for use on his Pacific...

Stephenson valve gear, sliding valves, alligator crossheads, and a saturated boiler. In 1917, the locomotive was upgraded with Southern valve gear, piston...

between two notched sector plates. The reversing rod, which connects to the valve gear, is attached to this lever, either above or below the pivot, in such a...

construction of 300 K class locomotives. Following experiments with Southern type valve gear on an earlier class, Chief Mechanical Engineer Edward Lucy proposed...

Locomotive Works for the Southern Railway (SOU), originally as a K class 2-8-0 Consolidation type with Stephenson valve gear, sliding valves, alligator crossheads...

An expansion valve is a device in steam engine valve gear that improves engine efficiency. It operates by closing off the supply of steam early, before...

Originally built with Baker valve gear and alligator crossheads, the Ps-4s were eventually re-equipped with Walschaerts valve gear and multiple-bearing crossheads...

Southampton Railway in Virginia. The SS&S installed Southern valve gear, a graceful outside drive gear. The 6 was eventually sold to the Argent Lumber Company...

roster. Unlike the previous EBT Mikados, these three locomotives used Southern valve gear and had boilers equipped with superheaters. The first of these Baldwin...

U class. The K1 rebuild featured a variant of the Gresley conjugated valve gear, previously trialled on the SR N1 class prototype, designed by one of...

again with a new boiler and reversed Southern valve gear replacing the original inside Stephenson's valve gear, this time incorporating a tender. It...

ambient, and a diaphragm in the demand valve senses this pressure difference and moves a lever to open the valve to allow breathing gas to flow into the...

contributions to the SECR and Southern Railway's motive power. He collaborated with Nigel Gresley to develop the Gresley conjugated valve gear for 3-cylinder locomotives...

modified Caprotti valve gear, relatively new to British locomotive engineering and more efficient than Walschaerts or Stephenson valve gear. The Duke was...

across the class was the valve gear, with 142 using Walschaerts valve gear and the remaining 30 using British Caprotti valve gear. There was little difference...

inches. It was also experimentally built as a 2-6-2 and fitted with Southern valve gear. It was modified to burn coal in June 1927. To provide enough heating...

A safety valve is a valve that acts as a fail-safe. An example of safety valve is a pressure relief valve (PRV), which automatically releases a substance...

completely different shape) and the chain-driven valve gear was replaced with conventional Walschaerts valve gear. The engine was now allocated to Bournemouth...

thermic syphons in their boilers and the controversial Bulleid chain-driven valve gear. The class members were named after the Merchant Navy shipping lines involved...

Broad Top #18 (1923), its newest, a model BLW 12-341⁄4-E, which used Southern valve gear and had boilers equipped with superheaters. More than 3 steam locomotives...

They also built with Walschaerts valve gear as opposed to the previous orders which were equipped with Baker valve gear. The final locomotive of the series...

the cab. The special valve gear operated four slide valves for each cylinder, two of which were worked by Stephenson valve gear, but used for reversing...

set-up of the Bulleid valve gear enabled a locomotive with no hammer blow. When the locomotives were rebuilt with Walschaerts valve gear, balance weights were...