求翻译：柱塞阀是由阀体、阀盖、阀杆、柱塞、手轮、密封圈、孔架等零部件组成。当旋转手轮的，通过阀杆带动柱塞，使之在两个密封圈之间上下往复运动，完成阀门的开启和关闭。是什么意思？

The plunger valve by the valve body, bonnet, stem, plunger, hand wheel, ring, hole rack and other parts. When the handwheel drive the piston through the valve stem so that reciprocating motion up and down between the two seals, complete valve opening and closing.

Piston valve is a valve body, valve covers, valve stem, plunger, and handwheel, seal, Jack-and other parts. When the rotation of the handwheel, driven through the valve stem of the plunger, in between two seals up and down strokes, complete valve on and off.

The plunger valve is by the valve chest, the valve cover, the valve lever, the plunger, the handwheel, the seal packing collar, spare parts and so on Kong Jia is composed.When the revolving handwheel, through the valve lever impetus plunger, causes it between two seal packing collars about the recip

Piston valve is a valve body, valve cover, valve rod, piston, hand wheel, consisting of parts such as seals, holes. When you rotate the handwheel, and through driven piston valve rod, make it up and down between the two seals for reciprocating motion, completing the opening and closing of the valve.

正在翻译，请等待...