Slowly open all ball valves to relieve air and water pressure. Loosen bolts on groove coupler and remove groove coupler and cover plate from valve body.

• 慢慢开启所有球阀，释放空气和水压力。松懈沟槽状联结器上的螺栓，从阀体上拆卸沟槽状联结器和阀盖板。