- De-Pressurize the system.
- Remove the top cover/bonnet and empty out the diaphragm chamber. Loosen all tubing connections to pilot controls and accessories to let water drain from them. This is especially crucial at the bottom main body taps where water accumulates due to gravity.
- On control pilots where water can accumulate at the bottom of the device, the device should be taken apart and drained of any accumulated fluid in all chambers.
You may also use compressed air blown through the system to rid the valve, devices, and entire pipeline of water. This is an alternative that usually works quite well; however, we recommend that this can be done as long as the compressed air not exceed 100 psi pneumatic. It is still best to follow this by draining it manually to ensure the will be no damage to the valve during freezing conditions.