Among others, they are particularly characterised by the cassette design and by the fact that every individual part that is theoretically subject to wear can be separately removed without prior dismantling of adjacent elements.

• 另外，这些阀门的特别之处就在于盒式的设计，以及每一个在理论上会有磨损的部件都可以在不拆除相邻的元件的情况下被取出来。