General application scenarios and selection of different types of manual valves

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This post was last edited by Sammy_Wang on 2015-10-16 at 09:38. General application scenarios and selection criteria for different types of manual valves – By Li Shaopeng from the Technical Department of Hangzhou Watt Energy Saving Engineering Co., Ltd. This article is sourced from the Internet. Valve type, main applications, actuators, notes: Ball valve (single-seat globe valve) – Used for rapid switching and regulation of fluids; applicable to steam and condensate water. Generally manual, but can also be electric, pneumatic, or hydraulic. Usually used in high-pressure or high-flow systems; rarely used for viscous or polluted fluids due to cost considerations. Plunger valves operate in a fully open or fully closed position; they are suitable for various fluids, especially those that cause wear on valve seats. They are generally operated manually, but can also be operated electrically or hydraulically. They are typically used in applications where long-term use is required with minimal maintenance. Gate valves are usually operated in either fully open or fully closed positions, and they are generally manual; electric or hydraulic operation is also possible. They are not recommended for use in throttling applications. Solid wedge gate valves are not affected by vibrations caused by the fluid flow, while double-faced parallel gate valves are commonly used in steam systems. Butterfly valves are installed on pipes of larger diameters for opening, closing, and regulating flow; they are commonly used in water systems, process industries, as well as in HPI systems. Their manual, electric, pneumatic, hydraulic, or air-driven operating mechanisms are relatively simple, and they can handle large diameters. For use in steam systems, an eccentric design is required; they are generally used in liquid systems. Ball valves have a wide range of applications and come in various diameters; they are often used in HPI systems, as well as in steam and condensate systems. Their operation can be done manually, electrically, pneumatically, or hydraulically, but their use is limited by the maximum pressure level they can handle