Cartridge valve GURU® DL2.1

manualfor waterdiesel

The GURU® DL2.1 is the most widely used and proven diesel locomotive freeze protection valve in the world. This self-operating valve is designed to monitor the water temperature of the engine’s water-cooling system and automatically snap open to drain it if the temperature drops to the valve’s set-point, preventing freezing, cracking, and bursting of water lines and tanks. Operation The GURU DL 2.1 locomotive freeze protection valve may be thought of as an automatic freeze-out plug with one crucial difference: The stainless-steel GURU® Cartridge releases itself from its body at a pre-set water temperature (35°F or 40°F), rather than being forced out by the tremendous pressure of expanding ice. This provides almost a full one-inch bore to rapidly drain a typical locomotive’s coolant system before damage can occur. Simply put, the self-operating GURU DL2.1 locomotive freeze protection drain valve continuously monitors and automatically responds to the temperature of the water-cooling system in diesel locomotives. If the water temperature falls to the valve’s set-point, the GURU® Plug will automatically snap open and drain the system before it can freeze. Resetting and rearming the GURU® Plug is easily accomplished by reheating the cartridge and reinserting it into the hex nut. We recommend utilizing our GURU® Flag and Clip or GURU® Flag and Key tool during the refill process to prevent the GURU® Plug from triggering open by the cold water during the refill. These tools provide a visual indicator that a refill process is in place and prevents personnel from using a penny, washer, zip tie, or another method to keep the valve stem in place.