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The self-operating HAT/RA-HP (Heat Actuated Trap/Reverse Acting – High Pressure) Thermostatic Thermal Relief Valve is installed onto the pump to monitor the fluid temperature. If the fluid temperature increases to within the operating range of the HAT/RA-HP, the thermal actuator will modulate the valve open to discharge the over-temperature fluid. As the outlet temperature falls, the valve then modulates toward the closed position, reducing flow. This modulating action maintains a relatively constant fluid temperature and reduces wasted water and energy.
The HAT/RA-HP Thermostatic Thermal Relief Valve is commonly used as a thermal relief valve on fire pumps and high-pressure water pumps to keep them cool during idling. It may be used as a regulating valve to maintain the flow of glycol, water, or other media in critical cooling applications and to economically remove heat from equipment or a process.
- Exclusive self-actuating Thermoloid® wax blend thermal actuator
- Rated for higher pressure systems – up to 1000 PSIG
- All stainless-steel body, fittings, spring and plug
- Compact low mass – fast response
- Corrosion resistant – long service life
- Ram-type plug for reliable shut-off
- Operates in narrow temperature band
- Self-operating – no external power source required
- Protects pump and pump seals from over-temperature damage
- Maintains constant discharge temperature
- Improves system efficiency
- Unaffected by pressure variations
- Discharges minimum amount of water to keep water temperature at safe limits
- Quick and easy installation
| Series | HAT/RA-HP |
| Description | 1/2" HAT/RA-HP-M/F |
| Size | 1/2" NPT |
| Diameter-in | 1.1 |
| Diameter-mm | 28 |
| Length-in | 3.8 |
| Length-mm | 97 |
| Weight lb | 1 |
| Weight kg | 0.5 |
| Cv | 0.7 |
| Maximum Operating Pressure | 1000 PSIG (69 BAR) |
| Maximum Temperature | 250°F (121°C) |
| Opening Temperature | 90°F, 95°F, 100°F, 105°F, 110°F, 125°F, 130°F, 140°F (32.2°C, 35°C, 37.8°C, 40.6°C, 43.3°C, 51.7°C, 54.4°C, 60°C) |
| Closing Temperature | Valve will close 10°F below the open temperature |
| Body Material | Stainless Steel |
| Seal Material | EPDM or Viton Seals |
| Isometric View | Download |
| Front View | Download |
| Top View | Download |
| Side View | Download |
