Several different valve needles were designed and manufactured for a superfluid helium system. 摘要針對某超流氦系統所需要的低溫節流閥，設計并加工了幾種不同結構形式和尺寸的閥針。
A throttle valve control device is composed of a stator core with a solenoid and a rotor carrying a throttle valve. 一種節流閥控制裝置，包括一個(gè)帶螺線(xiàn)管的定子鐵芯和一個(gè)帶節流閥的轉子。
Look for any signs of leaking between the gun and the unloader valve. 檢查一下水槍和減壓閥是否有泄漏的跡象。
No relief valve is required where two pressure reducing valves are installed. 如果裝上兩個(gè)減壓閥，就不需要安全閥。
