Relief valve
Pressure Relief Valves
Recommended for all cold water system installations – to protect against damage to piping and pressure tanks. PRV are set at 75 psi or 100 psi – adjustable from 75 to 150 psi. PRV have a +/- 15% setting accuracy.
Chart Reflects 3/4″ Valve
NOTE: These valves are not T&P valves that are required with water heaters. There is the same need for PRV on cold water pressure tanks.
NOTE: Merrill Manufacturing™ pressure relief valves may not reseat themselves after pressure relief. Manual disassembly and reseating of valve may be required. Repeated opening of a pressure relief valve is beyond intended use and voids warranty.
WARNING: All PRV, SSPRV, PRVNL, PRVHD and PRVHDNL valves must be set a minimum of 15 psi above the typical high of the water system pressure, so valve chatter or rapid open and close will not occur. Valve chatter can cause failure of the valve and voids warranty.
NOTE: All PRV valves are field adjustable – but removing cap and turning internal disk down to increase pressure. Field adjustment of valve voids warranty.
NOTE: Valve warranty void after change in adjustment due to possible error.
- Can be used in both vertical and horizontal positions.
- Merrill Manufacturing™ check and foot valves are individually boxed.
- Brass Pressure Relief Valve
- Stainless Steel Pressure Relief Valve
- No-Lead Brass Pressure Relief Valve
- PVC Pressure Relief Valve
- Approximage Relief in GPM from Heavy-Duty Pressure Relief Valves
- Heavy-Duty Pressure Relief Valves
- No-Lead Heavy-Duty Pressure Relief Valves
- USA Made in the USAMade Heavy-Duty Pressure Relief Valves
| Order No. | UPC Bar Code (Qty. 1) | Inlet x Outlet | Ctn. Qty. | Ctn. Wt./Lbs. |
|---|---|---|---|---|
| *PRV50 | 6 42367 02251 8 | 1/2″ x 1/2″ | 10 | 3.5 |
| PRV75 | 6 42367 02252 5 | 3/4″ x 1/2″ | 10 | 3.8 |
| •PRV50100 | 6 42367 11074 1 | 1/2″ x 1/2″ | 10 | 3.5 |
| •PRV75100 | 6 42367 11075 8 | 3/4″ x 1/2″ | 10 | 3.8 |
| •PRV757100 | 6 42367 11076 5 | 3/4″ x 3/4″ | 10 | 3.9 |
* A perfect companion to Merrill Manufacturing™ galvanized tank tees 1X, 100X, 102X and 125X.
• Valves set at 100 psi
| Order No. | UPC Bar Code (Qty. 1) | Inlet x Outlet | Ctn. Qty. | Ctn. Wt./Lbs. | ||||
|---|---|---|---|---|---|---|---|---|
| Ø SSPRV50 | 6 42367 12289 8 | 1/2″ x 1/2″ | 10 | 3.0 | ||||
| Ø SSPRV75 | 6 42367 12290 4 | 3/4″ x 1/2″ | 10 | 5.0 | ||||
| Ø SSPRV75775 | 6 42367 43419 9 | 3/4″ x 3/4″ | 10 | 5.2 | ||||
| Ø •SSPRV50100 | 6 42367 12942 2 | 1/2″ x 1/2″ | 10 | 3.0 | ||||
| Ø •SSPRV75100 | 6 42367 12943 9 | 3/4″ x 1/2″ | 10 | 5.0 | ||||
| Ø •SSPRV757100 | 6 42367 43420 5 | 3/4″ x 3/4″ | 10 | 5.2 |
• Valves set at 100 psi
| Order No. | UPC Bar Code (Qty. 1) | Inlet x Outlet | Ctn. Qty. | Ctn. Wt./Lbs. |
|---|---|---|---|---|
| ♦ PRVNL50 | 6 42367 08885 9 | 1/2″ x 1/2″ | 10 | 3.5 |
| ♦ PRVNL75 | 6 42367 08886 6 | 3/4″ x 1/2″ | 10 | 3.8 |
| Ø PRVNL757 | 6 42367 41251 7 | 3/4″ x 3/4″ | 10 | 3.9 |
| Ø •PRVNL50100 | 6 42367 12471 7 | 1/2″ x 1/2″ | 10 | 3.5 |
| Ø •PRVNL75100 | 6 42367 12472 4 | 3/4″ x 1/2″ | 10 | 3.5 |
| Ø •PRVNL757100 | 6 42367 12473 1 | 3/4″ x 3/4″ | 10 | 4.0 |
• Valves set at 100 psi
| Order No. | UPC Bar Code (Qty. 1) | Inlet x Outlet | Ctn. Qty. | Ctn. Wt./Lbs. |
|---|---|---|---|---|
| Ø *PVCPRV50 | 6 42367 11391 9 | 1/2″ MIP x 1/2″ FIP | 1 | .20 |
* A perfect companion to Merrill Manufacturing™ PVC tank tees 100C, 100CS, 100CSF and 1025CSF.
Approximage Relief in GPM from Heavy-Duty Pressure Relief Valves
| Set psi | 3/4″ | 1″ | 1-1/4″ | 1-1/2″ | 2″ |
|---|---|---|---|---|---|
| 50 | 15 | 25 | 44 | 68 | 132 |
| 60 | 16 | 28 | 48 | 75 | 145 |
| 70 | 17 | 30 | 52 | 81 | 156 |
| 80 | 19 | 32 | 55 | 87 | 167 |
| 90 | 20 | 34 | 59 | 92 | 177 |
| 100 | 21 | 36 | 62 | 97 | 187 |
| 110 | 21 | 36 | 62 | 97 | 187 |
| 120 | 23 | 39 | 68 | 106 | 205 |
| 130 | 24 | 41 | 71 | 110 | 213 |
| Order No. | UPC Bar Code (Qty. 1) | Inlet x Outlet | Ctn. Qty. | Ctn. Wt./Lbs. |
|---|---|---|---|---|
| PRVHD75 | 6 42367 04304 9 | 3/4″ x 3/4″ | 1 | 1.6 |
| PRVHD150 | 6 42367 05387 1 | 1-1/2″ x 1-1/2″ | 1 | 5.5 |
NOTE: Merrill Manufacturing™ PRVHD valves can be factory adjusted to a custom setting upon request at extra cost. Custom set relief valves are non-cancelable and non-returnable. PRVHD’s are set at 75 psi. PRVHD’s are recommended for use up to 150 psi on water systems only. PRVHD’s have a +/- 15% setting accuracy. Field adjustment of valve voids warranty.
| Order No. | UPC Bar Code (Qty. 1) | Inlet x Outlet | Ctn. Qty. | Ctn. Wt./Lbs. |
|---|---|---|---|---|
| Ø PRVHDNL75 | 6 42367 41210 4 | 3/4″ x 3/4″ | 1 | 1.6 |
| Ø PRVHDNL100 | 6 42367 41211 1 | 1″ x 1″ | 1 | 2.7 |
| Ø PRVHDNL125 | 6 42367 41212 8 | 1-1/4″ x 1-1/4″ | 1 | 4.3 |
| Ø PRVHDNL150 | 6 42367 41213 5 | 1-1/2″ x 1-1/2″ | 1 | 5.5 |
| Ø PRVHDNL200 | 6 42367 41214 2 | 2″ x 2″ | 1 | 9.3 |
NOTE: Merrill Manufacturing™ PRVHDNL valves can be factory adjusted to a custom setting upon request at extra cost. Custom set relief valves are non-cancelable and non-returnable. PRVHDNL’s are set at 75 psi. PRVHDNL’s are field adjustable and recommended for use up to 150 psi on water systems only. PRVHDNL’s have a +/- 15% setting accuracy. Field adjustment of valve voids warranty.
| Order No. | UPC Bar Code (Qty. 1) | Inlet x Outlet | Ctn. Qty. | Ctn. Wt./Lbs. |
|---|---|---|---|---|
| DPRV50 | 6 42367 642367 09301 3 | 1/2″ x 1/2″ | 1 | 2.3 |
| DPRV75 | 6 42367 09302 0 | 3/4″ x 3/4″ | 1 | 2.3 |
| DPRV100 | 6 42367 09303 7 | 1″ x 1″ | 1 | 3.5 |
| DPRV125 | 6 42367 09304 4 | 1-1/4″ x 1-1/4″ | 1 | 5.0 |
| DPRV150 | 6 42367 09305 1 | 1-1/2″ x 1-1/2″ | 1 | 6.3 |
| DPRV200 | 6 42367 09306 8 | 2″ x 2″ | 1 | 11.0 |
NOTE: Domestic Heavy-Duty pressure relief valves available, factory set at 5 psi to 300 psi. DPRV’s are set at 75 psi. DPRV’s are field adjustable and recommended for use up to 300 psi on water systems only. Field adjustment of valve voids warranty. Special order non-stock item.