當金屬閥門暴露于某些化學品和物質時，它們會生銹、腐蝕，并終損壞。在為化學工業選擇閥門時，一個關重要的考慮因素是它們能夠承受介質的極端特性。雖然閥門功能很重要，但是閥門耐受暴露于特定化學品的能力也同樣重要。因此，在選擇用于化學用途的閥門時，應同時考慮功能性和耐用性。較長的使用壽命意味著閥門材料將抵抗流動和流體特性的極端條件。

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，閥門有許多類型，其中大多數不是行業特定的。然而，某些閥門在處理化學品時表現非常好，包括球閥、閘閥、截止閥、旋塞閥、止回閥和各種迭代閥門。

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.

以下介紹幾種在化學應用中表現出色的閥門。

Below are several valves that perform well in chemical applications.

球閥

ball valve

球閥用于調節流量和壓力，其主要特點之一是其防漏設計。這種閥門在化學應用中尤其重要，尤其是在液體運輸的情況下。它的結構包括一個帶孔的旋轉球，移動90度以允許或阻止流量。通過稱為閥桿的組件由執行器或手輪操作，這些閥門不僅因其出色的功能而被廣泛使用，還因為它們具有成本效益、快速操作、易于維護和尺寸多功能性以適應各種流量和壓力。

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.

止回閥

Check valve

止回閥是一種帶有入口和出口開口的雙端口閥門。流體僅在一個方向流過設備，旨在防止逆流。這種閥門缺少閥桿和手柄，被歸類為自動閥門。自動化是機械的，流體壓力作用于閥門閘門，在泵送系統啟動時迫使其打開。這種閥門的優點包括其簡單的設計、緊湊的尺寸、自動操作、與閘閥相比的成本有效性、防止逆流和小的壓降。

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.

閘閥

Gate valve

閘閥設計用于關閉，有效地防止任何流體流動。不建議用于節流，因為使用該裝置調節流量會隨著時間的推移造成閥瓣損壞的高潛人才。就工作原理而言，該閥有一個板，用作流動屏障，從閥座進出以阻止或允許流體流動。通過通過螺紋閥桿連接的手輪或致動器操作，閘閥在處理液體和漿液介質以及在某種程度上處理固體和氣體的化工廠中表現良好。優點包括尺寸的多功能性，易于安裝、清潔和維修，以及的關閉。

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.

旋塞閥

Plug valve

旋塞閥在設計上類似于球閥，被歸類為四分之一轉閥。它們使用通過閥桿連接到手輪/執行器的端口旋塞來調節或關閉通過管道系統的流量。旋塞，圓柱形或圓錐形，旋轉90度以收縮或允許液體流動。這種閥門有兩種版本：潤滑和非潤滑。前者在閥門和旋塞之間使用潤滑劑，而后者使用聚合物套管來減少摩擦和改善密封。優點包括尺寸多功能性、快速操作、關閉和低壓降。

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.