Category
page 1Engine valves
poppet valve
valve typically used to control the timing and quantity of gas or vapour flow into an engine
Blowoff valve
a pressure release system in turbocharged engines
crankcase ventilation system
system to relieve pressure in a combustion engine's crankcase
desmodromic
reciprocating engine valve actuation mechanism

tappet
thumb|Roller tappet (shown in red) in an internal combustion engine
reed valve
type of check valve

sleeve valve
valve mechanism for piston engines
slide valve
Type of rectilinear valve
camless
engine type that controls valves without using conventional cams
Multi-valve
250px|thumb|A cylinder head of a four-valve [[Nissan VQ engine]]
Hydraulic tappet
device for maintaining zero valve clearance in an internal combustion engine
valve timing
timing of valve closing in engines
Corliss steam engine
type of steam engine using rotary steam valves
Caprotti valve gear
Type of steam engine valve gear with poppet valves driven by rotating cams