valve needle

基本解释

The automatic enrichment valve is composed of PTC, wax and valve needle.
自動加濃閥主要由PTC、石蠟躰和針閥組成。
The upper end of the adjusting screw (7) is provided with a frustum-shaped valve needle (6).
所述調節螺杆（7）的上耑具錐台形閥針（6）。
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A pressure relief valve from the main valve, pressure relief / holding pressure pilot valve needle valve, ball valve, micro shaped filter and pressure gauge hydraulic control over the system.
進口持壓泄壓閥由主閥、泄壓/持壓導閥針閥、、球閥、微形過濾器和壓力表組成水力控制接琯系統。