relief valve

Reattach the relief valve hose to the elbow in the bottom flange cover.

重新将阀软管接到底部法兰盖内弯头上。

Since cordite burns at a greater rate at a higher pressure a relief valve must be used to allow generated gas to escape to atmosphere at times when the demand is low.

因为柯达火药在较高压力下以较高速度燃烧，所以必须使用一个溢流阀，以便当用气少时，能让所产生部分气体排到大气中去。