The main valve fittings with screw lid release, pressure release valve.
将主阀盖上的配管接头螺丝松开，释放阀内压力。
Place the screw back into the relief valve disc and tighten.
将螺丝放回到安全阀阀瓣内，并加以紧固。
Screw type drain valve, convenient opening.
旋紧式泄水阀，开启方便。
Straight-through, right angle cast steel screw down vertical storm valve.
直通、直角铸钢可闭立式防浪阀；
Straight-through, right angle cast steel screw down vertical storm valve.
直通、直角铸钢可闭立式防浪阀；
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