Most people know that the ball valve is used with a circular channel for the opening and closing of the ball, the ball with the stem to open and close the valve action. The opening and closing of the ball valve is a perforated ball, rotating perpendicular to the axis of the channel, so as to achieve the purpose of opening and closing channels. Ball valve is mainly used to open and close the pipeline and equipment media purposes. The main advantages of the ball valve are as follows: For regular operation, quick opening and closing, light. Small fluid resistance. Simple structure, relative size, light weight, easy maintenance. Good sealing performance. Regardless of the installation direction, the flow of media can be arbitrary. No vibration, low noise. Ball valve structure can be divided into: floating ball valve, fixed ball valve, flexible ball valve and oil seal ball valve; by the channel can be divided into straight energy, angle and three-way, three-way can be divided into T and L-shaped two Species. By connecting workers can be divided into threaded connection, flange connection and welding three. Ball valve installation and maintenance should note the following: to leave the valve stem rotation position can not be used for throttling. Ball valve with gear should be upright installation.
The East-West glass slide is a glass slide or quartz slide that is used to place a glass slide or quartz slide when it is observed under a microscope. During production, a cell or a sample containing a certain tissue is randomly placed on the slide glass, and a cover slip is placed on it for observation a similar material that produces a phase difference.
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