Commonly Used Types of Manual Valves

Manual valves, as a pipeline fluid delivery system in the key control elements, its application throughout many industrial areas. A wide variety of varieties, different functions, its core objective is to ensure smooth fluid transportation and reliable guarantee of safe operation of the system. This article will elaborate on several typical manual valves widely used in the industry.

I. Manual Butterfly Valve

As a common type of valve, manual butterfly valve is popular for its simple structure and convenient operation. According to the different driving methods, it can be divided into two categories: handle butterfly valve and worm gear butterfly valve. Handle type butterfly valve is mainly used in pipeline system with small caliber, while worm gear butterfly valve is more suitable for large caliber pipeline control needs. Worm gear butterfly valve is driven by gear rolling in the turbine box to realize the opening and closing of the butterfly valve, which is not only labor-saving, but also highly efficient.

II. Manual Gate Valve

Manual gate valves are extremely common in water pipeline systems and are operated by opening and closing with a handwheel. According to its structural characteristics, it can be distinguished into two kinds of open-stem and concealed-stem. Open stem gate valve stem threads are partially exposed, so that the valve opening and closing status at a glance; in contrast, the stem of the dark stem gate valve is hidden inside the valve body, need to rotate until the valve can not be rotated to determine its opening and closing status.

III. Manual Ball Valve

Manual ball valves and manual butterfly valves are similar in structure and rely on manually operated handles or handwheels to control the opening and closing of the valve. The opening and closing parts of the ball valve are spherical in design, and the opening and closing of the valve is realized by the rotating motion of the ball in the centerline of the valve body. In the pipeline system, the ball valve is mainly responsible for cutting off, diverting and regulating the flow of media tasks.

IV. Manual globe valve

Manual globe valve in the opening and closing action, the friction resistance of the sealing surface is relatively low, with excellent wear resistance. In addition, its opening height is also moderate, excellent manufacturing technology, maintenance is very convenient. Nevertheless, in view of the opening and closing the required torque is larger, the structure length is also longer, therefore, usually its nominal diameter is limited to DN ≤ 200mm below.

Overall, the manual valve variety, each with its own characteristics. In specific application scenarios, must be based on the characteristics of the piping system and the working environment, select the appropriate type of valve, so as to protect the smooth operation of the system and safety and stability.