GURU PC® Freeze Protection Valve Overview
Passenger rail car potable water systems can be exposed to freezing conditions during layovers, locomotive switching, power outages, or other periods when car heat is unavailable. The GURU PC® provides water line freeze protection for potable water tanks, toilet modules, galleys, and associated piping from freeze-related damage. The valve is available in ¾″ and 1″ NPT sizes to accommodate different system requirements.
Design Features
- Thermoloid® paraffin wax actuator responds directly to ambient temperature
- Low lead brass/bronze construction
- Dual-port seals
- In-line serviceable cartridge allows maintenance without removing the valve body
Optional Heater Assembly
- 2 LED lights for easy visual check of power and heater
- Fully encapsulated PC board
- Self-limiting heater
- No moving parts to wear
- Minimal electrical noise
- Easy installation/removal with one hand
- Heaters available: 120VAC/74VDC & 230 VAC
GURU PC® Resources
Product Literature
Specification & Installation
- Installation and Maintenance Instructions
- 3/4″ GURU PC Rebuild Kit Installation and Maintenance Instructions
- 1″ GURU PC Rebuild Kit Installation and Maintenance Instructions
- CAD Files and Drawings
Additional Resources
Technical Specifications
- Size: ¾” NPT or 1” NPT
- Maximum Operating Pressure: 60 PSIG / 4.1 BAR (¾”) or 120 PSIG / 8.3 BAR (1″)
- Full Open Temperature: 35°F (1.7°C)
- Closing Temperature: 45°F (7°C)
- Operating/Storage Temperature Range: -67°F – 160°F (-55°C – 71°C)
Ordering
| 450-000000-035 | 3/4” GURU PC® |
| 451-000000-035 | 1” GURU PC® |
| 455-000000-060 | 120VAC/74VDC with plug and 5ft cord |
| 455-010000-060 | 120VAC/74VDC with plain end and 5ft cord |
| 456-010000-060 | 230VAC with plain end and 5ft cord |
Certifications & Compliance
- NSF/ANSI/CAN 61 & 372 Certified for potable water applications
- Shock & Vibration Tested for passenger rail service
- Electric heaters comply with fire safety requirements under Title 49, Chapter II, Part 238.103
GURU PC® Valve Installation
GURU PC® valves are typically installed inside equipment cabinets or between the inner and outer car body. The valve should be installed at the lowest point within the potable water-bearing system. Valves installed outside or underneath the car should be protected from impact and roadside debris.
How the GURU PC® Valve Works
This self-operating freeze protection valve continuously monitors ambient temperatures. It will automatically drain the water tanks of the rail car if the external temperature drops to the valve’s set point of 35°F (1.7°C). This preemptive action protects the system from freezing and prevents potentially costly damage.
When power and heat are restored to the rail car, the valve warms up and closes, enabling the water tanks to be refilled before the car returns to service. As the valve operates mechanically, it requires no electrical or air connections.
To expedite the refilling process after a valve activation, we recommend using our electric heater assembly. The heater attaches to the valve’s thermal actuator and quickly warms it, allowing the valve to close promptly and the system to be refilled sooner.
ThermOmegaTech® recommends testing the valve annually before freezing weather to confirm proper opening and closing. If testing shows sluggish or marginal closing performance, the cartridge assembly should be replaced approximately every two years. The in-line cartridge can be replaced without removing the valve body.
