This video shows how the Tartarini FL gas pressure regulator works by guiding you through its operation.
The FL is an accurate, pilot-operated regulator designed for high-pressure transmission/city gate natural gas service, large capacity distribution systems and power plant feeds. Type FL provides smooth and quiet operation, tight shutoff, long service life, zero bleed, and high capacity.
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In this video, we will learn how the Tartarini Type FL pressure regulator works through this product animation. The FL is a pilot-operated regulator, so it consists of a main valve, shown here installed in the flow line, plus a pilot, above. Also depicted is a prepilot (sometimes referred to as a pilot-supply regulator) which provides the pilot with a steady, reduced supply pressure, shown in orange.
Some important components on the main valve are:The disk, which appears to be floating but is actually stationary, held in place with supports that are not shown in this cutaway. Next, the sleeve which will be in the current position against the disk when no flow is required and will slide to the left when flow is needed. The FL is an axial flow regulator, meaning it has a straight-through flow design where the flow path has few bends, increasing flow capability and reducing noise. Next is the spring pushing the sleeve to the right, into the disk to provide shut off force. Last is the diaphragm which is attached to the sleeve. When a higher pressure is sent to the right side of the diaphragm, the sleeve will be pushed leftward, opening and allowing flow to pass downstream. Shown now is the main valve with elevated loading pressure shown in green on the right side of the diaphragm. You can see how this pressure has pushed the diaphragm to the left which moved the sleeve away from the disk. On the pilot, the most important components are: The disk, depicted here with a triangle shape, holding back the orange inlet supply pressure, The spring which can be adjusted to achieve the desired outlet pressure setpoint. The lower pilot diaphragm, which is watching the outlet pressure shown in blue. And lastly the restrictor which is a small opening that enables the main valve to close, by bleeding this green loading pressure downstream. Starting while the FL is in a lockup position, meaning at zero flow conditions, let’s see what happens when the downstream equipment begins consuming gas. Because the regulator is not meeting the increased flow demand, the blue outlet pressure decreases. The pilot detects this decrease in outlet pressure below its setpoint. The pilot spring is now exerting more force downward than the outlet pressure is exerting upward so the pilot’s diaphragm and disk move downward. This small movement by the pilot allows the higher pilot supply pressure to flood into the loading pressure chamber, increasing the loading pressure high enough that it overcomes the main valve spring. This opens the main valve, supplying the increased flow demand while holding outlet pressure slightly below setpoint. Before we go through that motion again, notice the order of events: First, the Outlet Pressure Changed. Second, the pilot responded to the outlet pressure change by repositioning. Third, the loading pressure responded to the pilot repositioning. And fourth, the main valve responded to the loading pressure change. It is the same order of events on every style of pilot-operated regulator both during opening and closing. The pilot, which is the brains, sees a change in outlet pressure and makes the main valve respond. With that in mind let’s watch the animation again. The outlet pressure is decreasing below setpoint, the pilot notices and is now sending a pneumatic signal to the main valve that it should open because the downstream demand isn’t being satisfied.