当金属阀门暴露于某些化学品和物质时，它们会生锈、腐蚀，并终损坏。在为化学工业选择阀门时，一个关重要的考虑因素是它们能够承受介质的极端特性。虽然阀门功能很重要，但是阀门耐受暴露于特定化学品的能力也同样重要。因此，在选择用于化学用途的阀门时，应同时考虑功能性和耐用性。较长的使用寿命意味着阀门材料将抵抗流动和流体特性的极端条件。

When metal valves are exposed to certain chemicals and substances, they will rust, corrode, and ultimately be damaged. A crucial consideration when selecting valves for the chemical industry is their ability to withstand the extreme characteristics of the medium. Although valve function is important, the ability of valves to withstand exposure to specific chemicals is equally important. Therefore, when selecting valves for chemical purposes, both functionality and durability should be considered. A longer service life means that the valve material will resist extreme conditions of flow and fluid characteristics.

需要注意的是，阀门有许多类型，其中大多数不是行业特定的。然而，某些阀门在处理化学品时表现非常好，包括球阀、闸阀、截止阀、旋塞阀、止回阀和各种迭代阀门。

It should be noted that there are many types of valves, most of which are not industry-specific. However, some valves perform very well in handling chemicals, including ball valves, gate valves, globe valves, plug valves, check valves, and various iterative valves.

以下介绍几种在化学应用中表现出色的阀门。

Below are several valves that perform well in chemical applications.

球阀

ball valve

球阀用于调节流量和压力，其主要特点之一是其防漏设计。这种阀门在化学应用中尤其重要，尤其是在液体运输的情况下。它的结构包括一个带孔的旋转球，移动90度以允许或阻止流量。通过称为阀杆的组件由执行器或手轮操作，这些阀门不仅因其出色的功能而被广泛使用，还因为它们具有成本效益、快速操作、易于维护和尺寸多功能性以适应各种流量和压力。

Ball valves are used to regulate flow and pressure, and one of their main features is their leak proof design. This type of valve is particularly important in chemical applications, especially in liquid transportation. Its structure includes a rotating ball with a hole that moves 90 degrees to allow or prevent flow. These valves are widely used not only for their excellent functionality, but also for their cost-effectiveness, fast operation, ease of maintenance, and versatility in size to adapt to various flow rates and pressures, through components called valve stems operated by actuators or handwheels.

止回阀

Check valve

止回阀是一种带有入口和出口开口的双端口阀门。流体仅在一个方向流过设备，旨在防止逆流。这种阀门缺少阀杆和手柄，被归类为自动阀门。自动化是机械的，流体压力作用于阀门闸门，在泵送系统启动时迫使其打开。这种阀门的优点包括其简单的设计、紧凑的尺寸、自动操作、与闸阀相比的成本有效性、防止逆流和小的压降。

A check valve is a dual port valve with inlet and outlet openings. The fluid only flows through the device in one direction, aimed at preventing backflow. This type of valve lacks a stem and handle, and is classified as an automatic valve. Automation is mechanical, and fluid pressure acts on the valve gate, forcing it to open when the pumping system starts. The advantages of this valve include its simple design, compact size, automatic operation, cost-effectiveness compared to gate valves, prevention of backflow, and minimal pressure drop.

闸阀

Gate valve

闸阀设计用于关闭，有效地防止任何流体流动。不建议用于节流，因为使用该装置调节流量会随着时间的推移造成阀瓣损坏的高潜人才。就工作原理而言，该阀有一个板，用作流动屏障，从阀座进出以阻止或允许流体流动。通过通过螺纹阀杆连接的手轮或致动器操作，闸阀在处理液体和浆液介质以及在某种程度上处理固体和气体的化工厂中表现良好。优点包括尺寸的多功能性，易于安装、清洁和维修，以及的关闭。

Gate valves are designed for closure, effectively preventing any fluid flow. It is not recommended to use it for throttling, as using this device to regulate flow can cause high potential damage to the valve disc over time. In terms of working principle, the valve has a plate that serves as a flow barrier, entering and exiting from the valve seat to prevent or allow fluid flow. Gate valves perform well in chemical plants that handle liquids and slurries, as well as solids and gases to some extent, through the operation of handwheels or actuators connected by threaded valve stems. The advantages include versatility in size, ease of installation, cleaning, and maintenance, as well as perfect closure.

旋塞阀

Plug valve

旋塞阀在设计上类似于球阀，被归类为四分之一转阀。它们使用通过阀杆连接到手轮/执行器的端口旋塞来调节或关闭通过管道系统的流量。旋塞，圆柱形或圆锥形，旋转90度以收缩或允许液体流动。这种阀门有两种版本：润滑和非润滑。前者在阀门和旋塞之间使用润滑剂，而后者使用聚合物套管来减少摩擦和改善密封。优点包括尺寸多功能性、快速操作、关闭和低压降。

Plug valves are designed similar to ball valves and are classified as quarter turn valves. They use port cocks connected to the handwheel/actuator through the valve stem to regulate or close the flow through the piping system. Cock, cylindrical or conical, rotating 90 degrees to contract or allow liquid to flow. There are two versions of this valve: lubricated and non lubricated. The former uses lubricant between the valve and the plug, while the latter uses polymer sleeves to reduce friction and improve sealing. The advantages include versatility in size, fast operation, efficient shutdown, and low pressure drop.