How are sprinkler control valves usually locked in the open position?

Sprinkler control valves are typically locked in the open position using a chain and padlock system. This method is common because it provides a straightforward and secure way to prevent unauthorized closing of the valve. By locking the valve in the open position, it ensures that the sprinkler system remains operational and can respond immediately in case of a fire, thereby enhancing the safety of the structure and its occupants.

Using a chain and padlock allows for ease of access by authorized personnel, such as fire protection staff, while simultaneously restricting access to those who may inadvertently or intentionally close the valve. This practice is essential for maintaining the integrity and functionality of the sprinkler system, ensuring that it can adequately perform its fire suppression role when needed.