- Ficha técnica - 174A, 374, 740
- Installation Instructions - Tag for 174A, 335, 374A, 474A, 740, LF174A, LF474A, M375
- Specification Sheet - 174A, 374, 740
This 3/4 inch boiler pressure relief valve is used in hot water heating and domestic supply boiler applications to protect against excessive pressures on all types of hot water heating supply boiler equipment. It consists of a bronze body construction with NPT threaded female inlet and NPT threaded female outlet (drain) connections, non-metallic disc-to-metal seating, stainless steel spring, and test lever. It resists corrosive water conditions, sticking and freezing, and prevents water and sediment from being trapped in the seat. It is designed for emergency safety relief, not as an operating control. The pressure relief is set at 40 psi (275.8 kPa) with corresponding high pressure ratings up to 800,000 BTU/hr.800,000 BTU/hr.
Features
- Spring loaded
- Non mechanical seat-to-disc alignment will not stick or freeze
- Bronze body
- Automatic reseating
| Specifications | |
|---|---|
| Body Material | Bronze |
| Brand | Watts |
| Buy American Act Compliant | YES |
| EAN | 098268013078 |
| GPM-When Relieved | Does Not Apply to Product |
| Inlet Connection Size | 3/4 IN |
| Inlet Connection Type | Female Threaded |
| Inlet Thread Type | NPT |
| Lead Free | NO |
| Maximum Temperature-Fahrenheit | 250 |
| Maximum Working Pressure-PSI | 30 |
| Outlet Connection Size | 3/4 IN |
| Outlet Connection Type | Female Threaded |
| Outlet Thread Type | NPT |
| Part Number | 0274479 |
| Pressure Range | 30 to 150 PSI |
| Pressure Relief Setting-PSI | 40 |
| Pressure Steam Discharge Capacity | 800,000 BTU per hour |
| Protection Type | Pressure |
| Series | 174A |
| Shank Length | Does Not Apply to Product |
| Temperature Steam Discharge Capacity | Does Not Apply to Product |
| Thermostat Material | Does Not Apply To Product |
| Thermostat Probe Length | Does Not Apply to Product |