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A gate valve is generally used to completely shut off fluid flow or, in the fully open position, provide full flow in a pipeline. Thus it is used either in the fully closed or fully open positions. A gate valve consists of a valve body, seat and disc, a spindle, gland, and a wheel for operating the valve.
A gate valve consists of a valve body, seat and disc, a spindle, gland, and a wheel for operating the valve. The seat and the gate together perform the function of shutting off the flow of fluid.
It is recommended that the gate valve is installed with the gat e seal (carriage side) facing toward the chamber (vacuum side). Mounting the valve in this configuration will eliminate the pump down of the valve body. The gate valve may be mounted in either a vertical or horizontal position.
Gate valves have several external indicators that can help determine whether they are open or closed. These indicators include a stem, handle, and position indicator. The stem of a gate valve is a rod that connects the valve gate to the valve handle.
Generally, gate valves are installed in the areas of a pipeline where they will longer remain open or closed, as they generally require sometime to switch between these two positions.
The AWWA operating formula for opening/closing a gate valve is 3 times the nominal valve size plus 2 or 3 turns of the operating nut. For example, a 6-inch gate valve would require 6 x 3 = 18 turns plus 2 or 3 turns, for a total of 20 to 21 turns.
Gate valves should be spaced along water main at intervals not to exceed 500' for pipe sizes 10" diameter and above, and not to exceed 800' for pipe sizes less than 10" diameter.
Gate valves utilize either a rising or non-rising stem design. In-service temperatures are between approximately -20 to 60 °C. In service, pressure can be up to 16 bar. The maximum flow through the valve is between 5-20 meters per second depending upon if the flowing medium is a liquid or gas.