multi-valve       
adjective (also multivalve) uk/ˌmʌl.tiˈvælv/ us/ˌmʌl.tiˈvælv/ /ˌmʌl.taɪˈvælv/
 (发动机)多阀门的,多气门的
A multi-valve engine has several valves (= devices that control the flow of fuel).
  It has a 4.2-litre V8 multi-valve engine.  它使用4.2升的V8多气门发动机。 
 The test car was a cool looking two litre multivalve model in glacier blue.
 - More examples
 - It comes with fully independent suspension, speed sensitive steering, multi-valve V6 and a luxurious leather-trimmed interior.
 - They pioneered the use of four-wheel steering, multi-valve engines, and electronic transmission.
 - This is part of a multivalve turbine used in a dry compressor for the gas and oil industry.