valve needle

基本解释

The automatic enrichment valve is composed of PTC, wax and valve needle.
自动加浓阀主要由PTC、石蜡体和针阀组成。
The upper end of the adjusting screw (7) is provided with a frustum-shaped valve needle (6).
所述调节螺杆（7）的上端具锥台形阀针（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.
进口持压泄压阀由主阀、泄压/持压导阀针阀、、球阀、微形过滤器和压力表组成水力控制接管系统。