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The poppet valve was also used on the American Pennsylvania Railroad's T1 duplex locomotives, although the valves commonly failed because the locomotives were commonly operated in excess of 160 km/h (100 mph), and the valves were not meant for the stresses of such speeds. The poppet valves also gave the locomotive a distinctive "chuffing" sound.
There are three main categories for water temperature controlling devices: Heat Source, Group Control, and Point-of-Use. Heat Source. These are used with central heating systems that use water as a medium. Tempering valves for use on hot water heat distribution systems; High flow rates suitable for use in under floor (radiant) heating applications
A thermostatic radiator valve on position 2 (15–17 °C) Installed thermostatic radiator valve with the adjustment wheel removed. A thermostatic radiator valve (TRV) is a self-regulating valve fitted to hot water heating system radiator, to control the temperature of a room by changing the flow of hot water to the radiator.
The snifting valve is the small mushroom directly behind the chimney. The square cover beneath is another distinctive LNER feature, covering the end of the superheater header. A snifting valve (sometimes snifter valve) is an automatic anti-vacuum valve used in a steam locomotive when coasting. The word Snift imitates the sound made by the valve.
Mushroom valve may refer to: The exhaust valve of a diving mechanism; Poppet valve, a rigid flow control valve commonly used in engines and pumps
Elastomer mushroom valves serve the purpose adequately, [4]: 108 though duckbill valves were also common in twin-hose regulators. Where it is important to avoid leaks back into the regulator, such as when diving in contaminated water, a system of two sets of valves in series can reduce the risk of contamination.