This avoids any gradual lateral enlargement of the pilot hole.

上述技巧可以避免导航孔逐渐向外侧扩大。

The valve face is provided with a pilot hole or a micro fixing valve.

阀面上 冲有导向孔或微型固阀。

First thing you want to do is drill a pilot hole in the right location.

第一件事，你想要做的就是钻一个先导孔在正确的位置。

Normally Open: When the coil is energized, the pilot hole closed, the valve chamber and pressurized by the piston return spring throttle thrust, the electromagnetic valve is closed.

常开：当线圈通电时，先导孔关闭，阀上腔由活塞节流孔增压和复位弹簧的推力，电磁阀关闭。

When the coil power, the pilot valve by the spring return, pilot hole closed throttle valve chamber pressurized by the piston return spring and thrust, the electromagnetic valve is closed.

当线圈断电时，先导阀芯靠弹簧复位，先导孔关闭，阀腔由活塞节流孔增压和复位弹簧的推力，电磁阀关闭。