The primary purpose of a valve is to direct the flow of fluids by starting, stopping, and throttling flow to make modern processing possible. are designed to withstand pressure temperature, and flow, and can be found in homes and industry across the world. The most common found in the manufacturing industry are gate, globe, ball, check, butterfly, plug, needle, three-way, diaphragm, relief, angle, and multiport. All are selected for a specific purpose. are classified by flow control elements, function, and operating conditions, suc ....