418 This is a gate valve (check valve, butterfly valve, cut-off valve, magnetic valve, remote valve, relief valve, throttle valve, cock).
418 This is a gate valve (check valve, butterfly valve, cut-off valve, magnetic valve, remote valve, relief valve, throttle valve, cock).
这是一个闸阀（止回阀、蝶阀、切断阀、电磁阀、遥控阀、安全阀、节流阀、旋塞）。