Play great positioning pin ensures disc not because butterfly plate gravity drop, also can be installed in the valve stem end adjustment block to ensure that the butterfly plate fixed position.
弹赞定位销可保证蝶板不会因为蝶板重力作用下坠，还可在下阀杆端部设置调整块来保证蝶板位置固定。
Each must have stainless steel valve stem and decoration the valve should be provided with a waterproof housing and the end flange connection, unless otherwise indicated.
每个阀须有不锈钢干和装饰阀门应具有防水住房和提供法兰连接结束，除非另有说明。
A spring on the valve stem tends to hold the valve on its seat (closed). The lower end of the spring rests against the cylinder head.
气门杆上的弹簧使气门保持在气门座上(关闭状态)。弹簧的下端抵在气缸盖上。
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