球阀：是由旋塞阀演变而来。它具有相同的旋转90°动作，不同的是旋塞体是球体，有圆形通孔或通道通过其轴线。球面和通道口的比例应该是这样的，即当球旋转90°时，在进、出口处应全部呈现球面，从而截断流体流动。针阀：针阀是节流阀的一种，调节精度比较高。活门呈针状，沿水流方向动作，改变过流断面积，用以截断或调节流量的阀门。针阀是一种微调阀，其阀塞为针形，主要用作调节气流量。微调阀要求阀口开启逐渐变大，从关闭到开启最大能连续细微地调节。针形阀塞一般用经过淬火的钢制长针，而阀座是用锡、铜等软质材料制成。阀针与阀座问的密封是依靠其锥面紧密配合达到的。阀针的锥度有1：50和60锥角两种，锥表面要经过精细研磨。阀杆与阀座问的密封是靠波纹管实现的。球阀与针阀的区别：

　　针阀可以调节流量的大小，球阀不能调节流量；针阀完全打开需要将手柄拧几圈，而球阀只需转90°。

　　Ball valve: It evolved from a plug valve. It shares the same 90° rotational action, but the difference lies in the fact that the plug body is a ball with a circular through-hole or passage passing through its axis. The ratio between the spherical surface and the passage opening should be such that when the ball rotates 90°, the inlet and outlet ports should both present spherical surfaces, thereby cutting off fluid flow. Needle valve: A needle valve is a type of throttle valve with relatively high adjustment accuracy. The valve needle is needle-shaped and moves in the direction of water flow, changing the cross-sectional area of the flow passage to cut off or adjust the flow rate. A needle valve is a fine adjustment valve with a needle-shaped valve plug, mainly used to adjust air flow. Fine adjustment valves require the valve port to gradually open from closed to fully open, allowing for continuous and subtle adjustments. The needle-shaped valve plug is generally made of quenched steel long needles, while the valve seat is made of soft materials such as tin and copper. The sealing between the valve needle and the valve seat is achieved by their conical surfaces fitting tightly together. The conicity of the valve needle can be either 1:50 or 60 degrees, and the conical surface needs to be finely ground. The sealing between the valve stem and the valve seat is achieved by a bellows. Difference between ball valve and needle valve: Needle valves can adjust the flow rate, while ball valves cannot; to fully open a needle valve, the handle needs to be turned several turns, while a ball valve only needs to be rotated 90°.

　　在外型上区别更明显，针阀有手轮、球阀有手把。

　　 In terms of appearance, the difference is more pronounced. The needle valve has a handwheel, while the ball valve has a handle.

　　在液、气压控制管道上若要调节流量则选针阀，若快速截断流量则选球阀。

　　 To adjust the flow rate on liquid and pneumatic control pipelines, a needle valve should be selected; to quickly shut off the flow, a ball valve should be chosen.

　　本文由 良工阀门代理   友情奉献.更多有关的知识请点击  http://www.jnlgvf.com/   真诚的态度.为您提供为全面的服务.

　　更多有关的知识我们将会陆续向大家奉献.敬请期待.

　　This article is kindly contributed by Lianggong Valve Agency. For more relevant knowledge, please visit http://www.jnlgvf.com/ with a sincere attitude. We will provide you with comprehensive services and will continue to share more relevant knowledge with you. Please stay tuned