Specifications
Description
The Watts 53-035 1/2 is a 1/2" pressure relief valve for tankless / thermal expansion service, factory set at 35 psi. It features a bronze body. Rated to 175 psi.
This 1/2 inch pressure relief valve is used in residential applications to protect against excessive pressure on domestic storage tanks and tankless water heaters. It consists of a bronze body construction with 1/2 inch NPTF threaded male inlet and 1/2 inch NPTF threaded female (drain) outlet, and stainless steel spring. The pressure relief is set at 35 psi (2.4 bar).
Features
- Bronze body construction
- Pressure relief is set at 35 psi (2.4 bar)
- Stainless steel spring
- 1/2 inch NPTF threaded male inlet and 1/2 inch NPTF threaded female (drain) outlet
Common Questions
- What pressure is this valve set to?
- It is factory set to relieve at 35 psi. The setting is fixed and is not field-adjustable. Note the 175 psi figure in the specifications is the maximum of the series' pressure range — the ceiling the body is built for, not this valve's relief point. This valve opens at 35 psi. Match it to the appliance nameplate: the relief setting must not exceed the working pressure stamped on the vessel you are protecting.
- Can I use this on potable water?
- No. This model is not certified lead-free, so it cannot be installed in a potable (drinking) water line under the NSF/ANSI 372 weighted-average lead rule. Use it on non-potable service, or order the "LF" version of this model for potable water.
Specifications
- Type: Relief
- Size: 1/2"
- Inlet Size: 1/2"
- Outlet Size: 1/2"
- Connection: NPT
- Body Material: Bronze
- Max Pressure (psi): 175
- Pack Quantity: 50
- Country of Origin: United States
- Warranty: 1 Year Limited
- MPN: 53-035 1/2
- Certifications: ANSI Z21.22, CSA 4.4
- Lead-Free: No
- Relief Type: Pressure Only
- Factory Set Pressure (psi): 35
- Application: Tankless / Thermal Expansion
- Shank Length: Standard
- Connection Configuration: MNPT inlet x FNPT outlet
- Approved for Potable Water: No
- SentryPlus Alert Flood Sensor: No
Product Information
Dimensions
| Size Nominal | 1/2" | Inlet Size | 1/2" |
| Outlet Size | 1/2" | End Connection | NPT |
| Shank Length | Standard | — | — |
Details
| Series | 53 | Device Type | Relief |
| Body Material | Bronze | Max Pressure PSI | 175.0 psi |
| Pack Qty | 50 | Relief Type | Pressure Only |
| Set Pressure PSI | 35.0 psi | Application Class | Tankless / Thermal Expansion |
| Connection Config | MNPT inlet x FNPT outlet | — | — |
Certifications & Standards
| ANSI Z21.22 | CSA 4.4 |
Compare with similar products
| Relief Type | Pressure Only
| Pressure Only
| Pressure Only
| Pressure Only
| Pressure Only
| Pressure Only
|
| Set Pressure PSI | 35.0 psi | 125.0 psi | 125.0 psi | 150.0 psi | 150.0 psi | 75.0 psi |
| Application Class | Tankless / Thermal Expansion
| Tankless / Thermal Expansion
| Tankless / Thermal Expansion
| Tankless / Thermal Expansion
| Tankless / Thermal Expansion
| Tankless / Thermal Expansion
|
| Shank Length | Standard
| Standard
| Standard
| Standard
| Standard
| Standard
|
| Connection Config | MNPT inlet x FNPT outlet
| MNPT inlet x FNPT outlet
| MNPT inlet x FNPT outlet
| MNPT inlet x FNPT outlet
| MNPT inlet x FNPT outlet
| MNPT inlet x FNPT outlet
|
| Test Lever | — | — | Yes | — | Yes | Yes |
| Potable Approved | — | — | — | — | Yes | Yes |
| Series | 53
| 111
| 53L
| 53
| LF53L
| LF3L
|
| Country Of Origin | United States
| United States
| United States
| United States
| United States
| United States
|
| Warranty | 1 Year Limited
| 1 Year Limited
| 1 Year Limited
| 1 Year Limited
| 1 Year Limited
| 1 Year Limited
|
| Spec Sheet | — | |||||
| Install Sheet | — | |||||
| Device Type | Relief
| Relief
| Relief
| Relief
| Relief
| Relief
|
| Size Nominal | 1/2"
| 1/2"
| 1/2"
| 3/4"
| 1/2"
| 3/4"
|
| Inlet Size | 1/2"
| 1/2"
| 1/2"
| 3/4"
| 1/2"
| 3/4"
|
| Outlet Size | 1/2"
| 1/2"
| 1/2"
| 3/4"
| 1/2"
| 3/4"
|
| Lead Free | — | — | — | — | Yes | Yes |
| End Connection | NPT
| MNPT
| MNPT
| NPT
| MNPT
| NPT
|
| Body Material | Bronze
| Bronze
| Bronze
| Bronze
| — | — |
| Max Pressure PSI | 175.0 psi | 125.0 psi | 150.0 psi | 175.0 psi | 150.0 psi | 150.0 psi |
| Certifications | ANSI Z21.22, CSA 4.4
| — | ANSI Z21.22, CSA 4.4
| ANSI Z21.22, CSA 4.4
| ANSI Z21.22, CSA 4.4
| ASME Section XIII (HV), ANSI Z21.22, CSA 4.4
|
| Pack Qty | 50
| 50
| 50
| 50
| 50
| 50
|
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