Ball valve in the pipeline or waterway, can play a control pipe internal cut off or the role of Unicom. Can effectively control the flow of liquid, gas. Only need to gently turn the stem, you can play the role of control flow, coupled with the ball valve closed good, so very easy to use. Ball of the ball also reflects its working principle. The ball surface of the ball valve, will be set with a layer of glial film, whenever the need to close the switch, this layer of film will play a very good sealing effect, to fill the gap between the ball and the valve wall to prevent leakage of water. Therefore, the ball valve has a very good airtight.
The role of the ball valve is mainly cut off the flow, the distribution of flow and change the direction of flow, it can be 90 degrees rotation. There are many functions of the ball valve, it can also be used as a switch. In China, the ball valve is widely used in oil refining, long-distance pipeline, chemical, paper, pharmaceutical, water, electricity, municipal, steel and other industries, occupies a pivotal position in the national economy. It has a rotation of 90 degrees of action, the plug body for the ball, a circular through hole or channel through its axis. The ball valve is mainly used in the pipeline to cut, distribute and change the direction of flow of the media, it only needs to rotate 90 degrees of operation and a small turning torque can be closed tight. Ball valve is most suitable for the switch, cut off the valve to use, V-type ball valve. In addition to the valve should pay attention to the pipeline parameters, should pay special attention to the use of environmental conditions, because the electric valve in the electric device is a mechanical and electrical equipment, its use of its use by the environment greatly affected. Normally, the electric ball valve, butterfly valve in the following environment to pay special attention.
Ball valve type
1. Classification by function and use (1) Shut-off valve: Shut-off valve, also known as closed-circuit valve, its role is to turn on or cut off the medium in the pipeline. Shut-off valves include gate valves, globe valves, plug valves, ball valves, butterfly valves and diaphragm valves. (2) check valve: check valve, also known as one-way valve or check valve, its role is to prevent the medium in the pipeline back. Water pump off the end of the valve also belong to the check valve class. (3) safety valve: the role of safety valve is to prevent the pipe or device in the medium pressure exceeds the specified value, so as to achieve the purpose of security protection. 2. Classification by nominal pressure (1) Vacuum valve: refers to the working pressure below the standard atmospheric pressure of the valve. (2) low pressure valve: refers to the nominal pressure PN ≤ 1.6Mpa valve. (3) medium pressure valve: refers to the nominal pressure PN 2.5,4.0,6.4 MPa of the valve.