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The GURU® DL 2.1 is the most widely used and proven locomotive freeze protection valve in the world. It may be thought of as an automatic freeze-out plug with one important 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 the typical locomotive before damage can occur. Resetting and rearming the GURU® Plug is easily accomplished by simply reheating the cartridge and utilizing our GURU® Flag and Clip tool with slotted actuator feature. This feature prevents the GURU® Plug from triggering open again while refilling the cooling system with cold water.
- Locomotive engine and compressor set cooling systems
- Stand-by diesel heating circulators
- Back-up protection in event of shut-down
- Hot water cab heater lines
- On-board tanks and piping
- Thermal actuator sensing surface is the only wetted part
- Long service life: All moving parts are stainless steel
- Design excludes cooling water chemicals and other debris from moving parts
- Several body styles available for various applications: 1-1/4 NPT, tee, and flanged tee
- Paint mask minimizes accidental paint-ins
- Knob on cartridge for easy installation and removal even in hard to reach locations
- Choice of release temperatures: 35°F or 40°F
- Extra port for temperature bushing
- Will not trip or dump while locomotive is running
- Fully automatic - it never forgets to activate freeze protection
- Completely mechanical - No electrical or air connections required
- Not affected by air flow or air temperature - releases only when cooling water reaches set-point
- Rapid draining
- Easy system refill
- Easy maintenance and field tested
- Slotted actuator feature prevents nuisance dumps when refilling cooling system with cold water
- Unit automatically rearms after filling and reheating
- Optional domed anti-tamper cap eliminates ability to tamper with the valve resetting stem
- Self-operating, no power or signal required
| Series | DL 2.1 TYPE-S |
| Description | DL 2.1 TYPE-S |
| Opening Temperature | 40°F (4.4°C) |
| Closing Temperature | 50°F (10°C) |
| Body Material | Stainless Steel |
| Release Temperature | 40°F |
| Isometric View | Download |
| Front View | Download |
| Top View | Download |
| Side View | Download |
