Q21S活接焊接球阀也称高压球阀它具有旋转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。

Q21S活接焊接球阀的主要特点是本身结构紧凑，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。

Q21S活接焊接球阀优点：

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。

3．紧密稳定。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。

活接焊接球阀产品概述

活接焊接球阀是一种结合了活接连接与焊接连接方式的球阀，兼具安装便捷性与连接密封性，适用于需要频繁拆卸维护或管道固定连接的工况。以下是其产品概述：

活接焊接球阀- 结构组成：主要由阀体、球体、阀座、阀杆、活接部件、焊接端及执行机构（如手动、气动）等组成。一端为活接结构（如螺纹活接），便于快速拆卸和安装；另一端为焊接端，可与管道直接焊接，确保连接牢固、密封稳定。

活接焊接球阀- 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，依靠阀座与球体的紧密贴合实现密封，防止介质泄漏。

活接焊接球阀- 特点优势：活接端方便后期维护和更换，减少管道拆卸工作量；焊接端连接牢固，抗振动性强，适用于高压或固定管道系统；密封性能好，兼顾活接的灵活性与焊接的稳定性；操作简便，启闭迅速，流阻小。

活接焊接球阀- 技术参数：公称通径常见DN15-DN100等规格，公称压力一般为PN16-PN64，适用温度范围根据材质（如碳钢、不锈钢）不同，约为-20℃至300℃，特殊材质可耐受更高温度。

活接焊接球阀- 应用领域：广泛应用于石油化工、天然气、给排水、暖通等行业，尤其适用于既要让管道固定连接稳定性，又需定期维护的介质输送系统。

The union welded ball valve is a type of ball valve combining union connection welded connection, featuring convenient installation reliable sealing performance. It is suitable for working conditions requiring frequent disassembly for maintenance fixed pipeline connections. The product overview is as follows:

 The union welded ball- Structural composition: It mainly consists of a valve body, ball, valve seat, valve stem, union components, welded end, actuator (e.g., manual, pneumatic). One end is a union structure (such as a threaded union) for quick disassembly installation; the other end is a welded end, which can be directly welded to the pipeline to ensure firm connection reliable sealing.

The union welded ball- Working principle: The valve is opened closed by rotating the valve stem to drive the ball to rotate 90 degrees. When opened, the ball's through-hole aligns with the pipeline channel, allowing medium to flow; when closed, the ball blocks the channel, sealing is achieved by the close fit between the valve seat the ball to prevent medium leakage.

The union welded ball- Features advantages: The union end facilitates later maintenance replacement, reducing pipeline disassembly work; the welded end ensures firm connection strong vibration resistance, suitable for high-pressure fixed pipeline systems; it has excellent sealing performance, combining the flexibility of unions the stability of welding; it is easy to operate, with quick opening closing low flow resistance.

The union welded ball- Technical parameters: The nominal diameter commonly includes specifications such as DN15-DN100; the nominal pressure is generally PN16-PN64; the applicable temperature range varies by material (e.g., carbon steel, stainless steel), approximately -20℃ to 300℃, special materials can withstand higher temperatures.

The union welded ball- Application fields: Widely used in petrochemical, natural gas, water supply drainage, heating ventilation industries, especially suitable for medium transmission systems that require both reliable fixed pipeline connections regular maintenance.