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Gate valves

Gate valves are probably the most common valves in use today due to their widespread use in domestic water systems, but it should be noted that their popularity in industry has declined in recent years. However, they are still used where an uninterrupted flow is required, because the gate fully retracts into the bonnet, creating a minimal pressure drop, when the valve is in an open position. Gate valves are specifically intended for use in isolation applications.

A gate valve consists of four main components, the body, bonnet （or cover）, gate and stem. A typical gate valve is shown in Figure 12.1.1.