How to turn off the water pipe pressure relief valve without a key?

How to close the water pipe pressure reducing valve without a key;

1. Close the gate valve in front of the water pipe pressure reducing valve and open the gate valve behind the pressure reducing valve to create a downstream low-pressure environment;

2. Turn the adjusting screw counterclockwise to the upward position (low relative to the outlet pressure), and then close the gate valve behind the pressure reducing valve;

3, slowly open the gate valve in front of the pressure reducing valve to fully open;

4. Slowly turn the adjusting screw of the Gillette valve clockwise to adjust the outlet pressure to the required pressure (subject to the gauge pressure behind the valve);

5. After adjustment, lock the lock nut and close the water pipe pressure reducing valve without a key.