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The 160-RF pilot is a spring and diaphragm operated pilot designed to sense a differential across an external orifice plate.
It is a normally open pilot that also has a sensing port is in the spring casing, above the diaphragm and is available in stainless steel. The inner valve is held open by the spring and when the control pressure below the diaphragm exceeds the combined forces of the spring and the sensing pressure, the pilot valve closes. The 160-RF is the standard rate of flow control pilot on all 106 and 206 series valves.