A type of valve, typically found on small-diameter pipework, that incorporates an orifice or flow-restriction device to control fluid flow.

一般用于小直径管道系统的一种阀。它包括一个用于控制流体流动的孔板或限流装置。

youdao

Excessive length, over 30' (9.14m), or use of more than four elbows can cause a restriction and reduce the discharge capacity of the valve.

太长的长度，超过9.14米，或者采用的弯头数量超过4个，对于安全阀的排泄能力都可能造成阻碍。

youdao