Air In The Pilot System
Air is your number one enemy in the pilot system as it will give false readings and cause poor valve operation. Bleed air from the valve bonnet. If the valve is equipped with a position indicator, on top of the position indicator is a bleed cock. Open the bleed cock slightly by turning the handle counter-clockwise. Otherwise, bleed the air from the high point of the valve. If the water runs clear, and no air bubbles are seen in the glass of the position indicator close the bleed cock. if air is present (the water will be foamy white) run the water until the air is gone.
Keeping you control valves in good health;
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Whether that brand new control valve in your system is the first one you have ever had to look after or if you are an old hand at valve maintenance with tens of valves in your system, there are a few simple guidelines and reminders for keeping it operating at optimal performance. Initially we would recommend physically checking on your valves every week or so, assuming everything is running fine in the system.
This inspection is really to check for any leaks in the tubing, checking pressure gauges to ensure valve is actually doing what it is supposed to and generally inspecting for anything that just looks abnormal. If it is determined that something is wrong, always ensure you have the correct instruction manual for the valve.
These days all manufacturers have these available on their websites. As a note of caution, these valves are under pressure and care should be taken to bleed pressure off the valve before you start to take any valves apart. (As a typical example in a 6” valve with 100psi in the line, there is at least 2,800 lbs of force trying to push that cover off the valve, so safety first!)