Q17Y内螺纹固定球阀的球和阀座都是通过喷焊STL合金后进行配合研磨。可以耐高温到650℃，高压42MPa,可以通过颗粒状介质。它具有旋转90度的动作，旋塞体为球体，有圆形通孔或通道通过其轴线。球阀在管路中主要用来做切断、分配和改变介质的流动方向，它只需要用旋转90度的操作和很小的转动力矩就能关闭严密。球阀适宜做开关、切断阀使用，但近来的发展已将球阀设计成使它具有节流和控制流量之用，如V型球阀。

   Q17Y内螺纹固定球阀的主要特点是结构紧凑，密封稳定，结构简单，维修方便，密封面与球面常在闭合状态，不易被介质冲蚀，易于操作和维修，适用于水、溶剂、酸和天然气等一般工作介质，而且还适用于工作条件恶劣的介质，如氧气、过氧化氢、甲烷和乙烯等，在各行业得到广泛的应用。球阀阀体可以是整体的，也可以是组合式的。

       Q17Y内螺纹固定球阀优点：

1．流体阻力小，全通径的球阀基本没有流阻。

2．结构简单、体积小、重量轻。耐高温 耐高压 方便安装执行机构。

3．紧密性好。它有两个密封面，而且目前球阀的密封面材料广泛使用各种塑料，密封性好，能实现完全密封。在真空系统中也已广泛使用。

4．操作方便，开闭迅速，从全开到全关只要旋转90°，便于远距离的控制。

5．维修方便，球阀结构简单，密封圈一般都是活动的，拆卸更换都比较方便。

6．在全开或全闭时，球体和阀座的密封面与介质隔离，介质通过时，不会引起阀门密封面的侵蚀。

7．适用范围广，通径从小到几毫米，大到几米，从高真空至高压力都可应用。

8．由于球阀在启闭过程中有擦拭性，所以可用于带悬浮固体颗粒的介质中。

内螺纹固定球阀产品概述

内螺纹固定球阀是一种采用内螺纹连接方式且球体位置固定的球阀，通过阀体两端的内螺纹与管道连接，结构紧凑，适用于空间受限的中小口径管道系统。以下是其产品概述：

内螺纹固定球阀- 结构组成：主要由阀体、固定球体、阀座、阀杆、内螺纹接口及执行机构（多为手动）等部件组成。球体与阀杆连接牢固，工作时球体仅做旋转运动而无轴向位移，确保密封稳定性；阀体两端的内螺纹（如NPT、G螺纹等）用于与管道直接连接。

内螺纹固定球阀- 工作原理：通过旋转阀杆带动球体旋转90度实现启闭。开启时，球体通孔与管道通道对齐，介质流通；关闭时，球体阻断通道，利用阀座与球体的紧密贴合形成密封，防止介质泄漏。

内螺纹固定球阀- 特点优势：结构紧凑，体积小，节省安装空间；内螺纹连接无需额外法兰，安装便捷且成本较低；球体固定设计减少密封面磨损，延长使用寿命；密封性能，适用于中低压工况；操作轻便，启闭迅速。

内螺纹固定球阀- 技术参数：公称通径常见DN6-DN50等规格，公称压力一般为PN16-PN64，适用温度范围根据材质（如黄铜、不锈钢）不同，约为-20℃至200℃，特殊材质可更高。

内螺纹固定球阀- 应用领域：广泛用于给排水、暖通空调、小型化工设备、仪器仪表等领域，控制水、气体、油品等中小流量介质的通断。

The female thread fixed ball valve is a type of ball valve with female thread connection a fixed ball position. It connects to pipelines through female threads at both ends of the valve body, featuring a compact structure suitable for small medium - diameter pipeline systems with limited space. The product overview is as follows:

The female thread fixed ball- Structural composition: It mainly consists of components such as valve body, fixed ball, valve seat, valve stem, female thread interface actuator (mostly manual). The ball is firmly connected to the valve stem, during operation, the ball only rotates without axial displacement, ensuring sealing stability; the female threads (such as NPT, G threads, etc.) at both ends of the valve body are used for direct connection with pipelines.

The female thread fixed ball- Working principle: The valve is opened closed by rotating the valve stem to drive the ball to rotate 90 degrees. When opened, the through - hole of the ball is aligned with the pipeline channel, allowing medium to flow; when closed, the ball blocks the channel, a seal is formed by the close fit between the valve seat the ball to prevent medium leakage.

The female thread fixed ball- Features advantages: It has a compact structure small volume, saving installation space; the female thread connection does require additional flanges, making installation convenient cost - effective; the fixed ball design reduces wear on the sealing surface prolongs service life; it has reliable sealing performance, suitable for medium low pressure working conditions; it is easy to operate with quick opening closing.

The female thread fixed ball- Technical parameters: The nominal diameter commonly includes specifications such as DN6 - DN50; the nominal pressure is generally PN16 - PN64; the applicable temperature range varies by material (such as brass, stainless steel), approximately - 20℃ to 200℃, special materials can withstand higher temperatures.

The female thread fixed ball- Application fields: Widely used in water supply drainage, heating, ventilation air conditioning, small chemical equipment, instruments meters other fields, to control the on - off of small medium flow media such as water, gas oil products.