Operation
The GURU® DL2.1 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 a typical locomotive’s engine coolant system before damage can occur.
Benefits
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
Not affected by air flow or air temperature surrounding valve – releases only when cooling water reaches setpoint
Rapid draining
Easy system refill
Models available to convert existing freeze protection
Easily tested in field
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
Design Features
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
Easy maintenance
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 awkward locations
Choice of release temperatures: 35°F or 40°F
Applications
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
Operation
The GURU® DL2.1 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 a typical locomotive’s engine coolant system before damage can occur.
Benefits
- 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
- Not affected by air flow or air temperature surrounding valve – releases only when cooling water reaches setpoint
- Rapid draining
- Easy system refill
- Models available to convert existing freeze protection
- Easily tested in field
- 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
Design Features
- 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
- Easy maintenance
- 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 awkward locations
- Choice of release temperatures: 35°F or 40°F
Applications
- 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
