valve head meaning in English

阀头
气门头
汽门头

Connection intercepting valve head
中间阀盖接头
Experimental and theoretical research on valve head compensation for nonlinear characteristic of evaporator
阀头线型对蒸发器非线性补偿的理论与试验研究
Also the valve heads will be liable to be burnt by the passing hot gases , and there is the likelihood of the piston crown touching an open valve , which can seriously damage the engine
此外气门头易于被通过的热气体燃烧，这有可能使活塞频繁冲击打开的气门，使发动机严重损坏。