Proportional Relief Valves - Low Pressure
Proportional Relief Valves
Low Pressure Proportional Relief Valves
RL Series proportional relief valves protect pressure sensitive equipment in systems with working pressures up to 300 psig (20.6 bar) and set pressures from 10 to 225 psig (0.7 to 15.5 bar).
Set Pressures:
- Temperature Range: -40 to 300°F (-40 to 300°C)
- MAWP: 300 psig (20.6 bar)
- Set Pressure Range: 10 to 225 psig (0.7 to 15.5 bar) One spring for the full set pressure range. RL Series valves are shipped with springs installed.
End Connections:
- RL3: 1/4 in., 6 mm and 8 mm tube ends, 1/4 in. NPT and BSPT pipe ends
- RL4: 1/2 in. and 12 mm tube ends 1/2 in. NPT and BSPT pipe ends
Options
- Factory set valves
- Manual override handle
- Seal Materials
- Fluorocarbon FKM (Standard)
- Nitrile
- Ethylene Propylene
Part # |
CAD |
Body Material |
Connection 1 - Type |
Connection 1 - Size |
Connection 2 - Type |
Connection 2 - Size |
Seal Material |
Set Pressure Range |
Product Descriptions |
End Connection Type |
|---|---|---|---|---|---|---|---|---|---|---|
| RL34MRT4FRT-316 |
CAD
N/A 
|
Body Material N/A 316 SS | Connection 1 - Type N/A Male BSPT | Connection 1 - Size N/A 1/4 in | Connection 2 - Type N/A Female BSPT | Connection 2 - Size N/A 1/4 in | Seal Material N/A FKM | Set Pressure Range N/A 10 to 225 psig0.7 to15.5 bar | Product Descriptions N/A Male to Female ISO Tapered Proportional Relief Valve | End Connection Type N/A Male British Standard Pipe Tapered by Female British Standard Pipe Tapered |
| RL34MRT4FRT-316-BN |
CAD
N/A
|
Body Material N/A 316 SS | Connection 1 - Type N/A Male BSPT | Connection 1 - Size N/A 1/4 in | Connection 2 - Type N/A Female BSPT | Connection 2 - Size N/A 1/4 in | Seal Material N/A Nitrile | Set Pressure Range N/A 10 to 225 psig0.7 to15.5 bar | Product Descriptions N/A Male to Female ISO Tapered Proportional Relief Valve | End Connection Type N/A Male British Standard Pipe Tapered by Female British Standard Pipe Tapered |
| RL34MRT4FRT-316-EP |
CAD
N/A
|
Body Material N/A 316 SS | Connection 1 - Type N/A Male BSPT | Connection 1 - Size N/A 1/4 in | Connection 2 - Type N/A Female BSPT | Connection 2 - Size N/A 1/4 in | Seal Material N/A EPDM | Set Pressure Range N/A 10 to 225 psig0.7 to15.5 bar | Product Descriptions N/A Male to Female ISO Tapered Proportional Relief Valve | End Connection Type N/A Male British Standard Pipe Tapered by Female British Standard Pipe Tapered |
| RL34PM4PF-316 |
CAD
N/A
|
Body Material N/A 316 SS | Connection 1 - Type N/A MNPT | Connection 1 - Size N/A 1/4 in | Connection 2 - Type N/A FNPT | Connection 2 - Size N/A 1/4 in | Seal Material N/A FKM | Set Pressure Range N/A 10 to 225 psig0.7 to15.5 bar | Product Descriptions N/A Male to Female NPT Proportional Relief Valve | End Connection Type N/A Male National Pipe Thread by Female National Pipe Thread |
| RL34PM4PF-316-BN |
CAD
N/A
|
Body Material N/A 316 SS | Connection 1 - Type N/A MNPT | Connection 1 - Size N/A 1/4 in | Connection 2 - Type N/A FNPT | Connection 2 - Size N/A 1/4 in | Seal Material N/A Nitrile | Set Pressure Range N/A 10 to 225 psig0.7 to15.5 bar | Product Descriptions N/A Male to Female NPT Proportional Relief Valve | End Connection Type N/A Male National Pipe Thread by Female National Pipe Thread |
| RL34PM4PF-316-EP |
CAD
N/A
|
Body Material N/A 316 SS | Connection 1 - Type N/A MNPT | Connection 1 - Size N/A 1/4 in | Connection 2 - Type N/A FNPT | Connection 2 - Size N/A 1/4 in | Seal Material N/A EPDM | Set Pressure Range N/A 10 to 225 psig0.7 to15.5 bar | Product Descriptions N/A Male to Female NPT Proportional Relief Valve | End Connection Type N/A Male National Pipe Thread by Female National Pipe Thread |
| RL34PMD4-316 |
CAD
N/A
|
Body Material N/A 316 SS | Connection 1 - Type N/A MNPT | Connection 1 - Size N/A 1/4 in | Connection 2 - Type N/A Duolok Tube Fitting | Connection 2 - Size N/A 1/4 in | Seal Material N/A FKM | Set Pressure Range N/A 10 to 225 psig0.7 to15.5 bar | Product Descriptions N/A Male NPT to Duolok Tube Fitting Proportional Relief Valve | End Connection Type N/A Male National Pipe Thread by Duolok Tube End |
| RL34PMD4-316-BN |
CAD
N/A
|
Body Material N/A 316 SS | Connection 1 - Type N/A MNPT | Connection 1 - Size N/A 1/4 in | Connection 2 - Type N/A Duolok Tube Fitting | Connection 2 - Size N/A 1/4 in | Seal Material N/A Nitrile | Set Pressure Range N/A 10 to 225 psig0.7 to15.5 bar | Product Descriptions N/A Male NPT to Duolok Tube Fitting Proportional Relief Valve | End Connection Type N/A Male National Pipe Thread by Duolok Tube End |
| RL34PMD4-316-EP |
CAD
N/A
|
Body Material N/A 316 SS | Connection 1 - Type N/A MNPT | Connection 1 - Size N/A 1/4 in | Connection 2 - Type N/A Duolok Tube Fitting | Connection 2 - Size N/A 1/4 in | Seal Material N/A EPDM | Set Pressure Range N/A 10 to 225 psig0.7 to15.5 bar | Product Descriptions N/A Male NPT to Duolok Tube Fitting Proportional Relief Valve | End Connection Type N/A Male National Pipe Thread by Duolok Tube End |
| RL3D4-316 |
CAD
N/A
|
Body Material N/A 316 SS | Connection 1 - Type N/A Duolok Tube Fitting | Connection 1 - Size N/A 1/4 in | Connection 2 - Type N/A Duolok Tube Fitting | Connection 2 - Size N/A 1/4 in | Seal Material N/A FKM | Set Pressure Range N/A 10 to 225 psig0.7 to15.5 bar | Product Descriptions N/A Duolok Tube End Plug Proportional Relief Valve | End Connection Type N/A Duolok Tube End |
| RL3D4-316-BN |
CAD
N/A
|
Body Material N/A 316 SS | Connection 1 - Type N/A Duolok Tube Fitting | Connection 1 - Size N/A 1/4 in | Connection 2 - Type N/A Duolok Tube Fitting | Connection 2 - Size N/A 1/4 in | Seal Material N/A Nitrile | Set Pressure Range N/A 10 to 225 psig0.7 to15.5 bar | Product Descriptions N/A Duolok Tube End Plug Proportional Relief Valve | End Connection Type N/A Duolok Tube End |
| RL3D4-316-EP |
CAD
N/A
|
Body Material N/A 316 SS | Connection 1 - Type N/A Duolok Tube Fitting | Connection 1 - Size N/A 1/4 in | Connection 2 - Type N/A Duolok Tube Fitting | Connection 2 - Size N/A 1/4 in | Seal Material N/A EPDM | Set Pressure Range N/A 10 to 225 psig0.7 to15.5 bar | Product Descriptions N/A Duolok Tube End Plug Proportional Relief Valve | End Connection Type N/A Duolok Tube End |
| RL3DM6-316 |
CAD
N/A
|
Body Material N/A 316 SS | Connection 1 - Type N/A Duolok Tube Fitting | Connection 1 - Size N/A 6 mm | Connection 2 - Type N/A Duolok Tube Fitting | Connection 2 - Size N/A 6 mm | Seal Material N/A FKM | Set Pressure Range N/A 10 to 225 psig0.7 to15.5 bar | Product Descriptions N/A Duolok Tube End Plug Proportional Relief Valve | End Connection Type N/A Duolok Tube End |
| RL3DM6-316-BN |
CAD
N/A
|
Body Material N/A 316 SS | Connection 1 - Type N/A Duolok Tube Fitting | Connection 1 - Size N/A 6 mm | Connection 2 - Type N/A Duolok Tube Fitting | Connection 2 - Size N/A 6 mm | Seal Material N/A Nitrile | Set Pressure Range N/A 10 to 225 psig0.7 to15.5 bar | Product Descriptions N/A Duolok Tube End Plug Proportional Relief Valve | End Connection Type N/A Duolok Tube End |
| RL3DM6-316-EP |
CAD
N/A
|
Body Material N/A 316 SS | Connection 1 - Type N/A Duolok Tube Fitting | Connection 1 - Size N/A 6 mm | Connection 2 - Type N/A Duolok Tube Fitting | Connection 2 - Size N/A 6 mm | Seal Material N/A EPDM | Set Pressure Range N/A 10 to 225 psig0.7 to15.5 bar | Product Descriptions N/A Duolok Tube End Plug Proportional Relief Valve | End Connection Type N/A Duolok Tube End |
| RL3DM8-316 |
CAD
N/A
|
Body Material N/A 316 SS | Connection 1 - Type N/A Duolok Tube Fitting | Connection 1 - Size N/A 8 mm | Connection 2 - Type N/A Duolok Tube Fitting | Connection 2 - Size N/A 8 mm | Seal Material N/A FKM | Set Pressure Range N/A 10 to 225 psig0.7 to15.5 bar | Product Descriptions N/A Duolok Tube End Plug Proportional Relief Valve | End Connection Type N/A Duolok Tube End |
| RL3DM8-316-BN |
CAD
N/A
|
Body Material N/A 316 SS | Connection 1 - Type N/A Duolok Tube Fitting | Connection 1 - Size N/A 8 mm | Connection 2 - Type N/A Duolok Tube Fitting | Connection 2 - Size N/A 8 mm | Seal Material N/A Nitrile | Set Pressure Range N/A 10 to 225 psig0.7 to15.5 bar | Product Descriptions N/A Duolok Tube End Plug Proportional Relief Valve | End Connection Type N/A Duolok Tube End |
| RL3DM8-316-EP |
CAD
N/A
|
Body Material N/A 316 SS | Connection 1 - Type N/A Duolok Tube Fitting | Connection 1 - Size N/A 8 mm | Connection 2 - Type N/A Duolok Tube Fitting | Connection 2 - Size N/A 8 mm | Seal Material N/A EPDM | Set Pressure Range N/A 10 to 225 psig0.7 to15.5 bar | Product Descriptions N/A Duolok Tube End Plug Proportional Relief Valve | End Connection Type N/A Duolok Tube End |
| RL48PM8PF-316 |
CAD
N/A
|
Body Material N/A 316 SS | Connection 1 - Type N/A MNPT | Connection 1 - Size N/A 1/2 in | Connection 2 - Type N/A FNPT | Connection 2 - Size N/A 1/2 in | Seal Material N/A FKM | Set Pressure Range N/A 10 to 225 psig0.7 to15.5 bar | Product Descriptions N/A Male to Female NPT Proportional Relief Valve | End Connection Type N/A Male National Pipe Thread by Female National Pipe Thread |
| RL48PM8PF-316-BN |
CAD
N/A
|
Body Material N/A 316 SS | Connection 1 - Type N/A MNPT | Connection 1 - Size N/A 1/2 in | Connection 2 - Type N/A FNPT | Connection 2 - Size N/A 1/2 in | Seal Material N/A Nitrile | Set Pressure Range N/A 10 to 225 psig0.7 to15.5 bar | Product Descriptions N/A Male to Female NPT Proportional Relief Valve | End Connection Type N/A Male National Pipe Thread by Female National Pipe Thread |
| RL48PM8PF-316-EP |
CAD
N/A
|
Body Material N/A 316 SS | Connection 1 - Type N/A MNPT | Connection 1 - Size N/A 1/2 in | Connection 2 - Type N/A FNPT | Connection 2 - Size N/A 1/2 in | Seal Material N/A EPDM | Set Pressure Range N/A 10 to 225 psig0.7 to15.5 bar | Product Descriptions N/A Male to Female NPT Proportional Relief Valve | End Connection Type N/A Male National Pipe Thread by Female National Pipe Thread |
| RL48PMD8-316 |
CAD
N/A
|
Body Material N/A 316 SS | Connection 1 - Type N/A MNPT | Connection 1 - Size N/A 1/2 in | Connection 2 - Type N/A Duolok Tube Fitting | Connection 2 - Size N/A 1/2 in | Seal Material N/A FKM | Set Pressure Range N/A 10 to 225 psig0.7 to15.5 bar | Product Descriptions N/A Male NPT to Duolok Tube Fitting Proportional Relief Valve | End Connection Type N/A Male National Pipe Thread by Duolok Tube End |
| RL48PMD8-316-BN |
CAD
N/A
|
Body Material N/A 316 SS | Connection 1 - Type N/A MNPT | Connection 1 - Size N/A 1/2 in | Connection 2 - Type N/A Duolok Tube Fitting | Connection 2 - Size N/A 1/2 in | Seal Material N/A Nitrile | Set Pressure Range N/A 10 to 225 psig0.7 to15.5 bar | Product Descriptions N/A Male NPT to Duolok Tube Fitting Proportional Relief Valve | End Connection Type N/A Male National Pipe Thread by Duolok Tube End |
| RL48PMD8-316-EP |
CAD
N/A
|
Body Material N/A 316 SS | Connection 1 - Type N/A MNPT | Connection 1 - Size N/A 1/2 in | Connection 2 - Type N/A Duolok Tube Fitting | Connection 2 - Size N/A 1/2 in | Seal Material N/A EPDM | Set Pressure Range N/A 10 to 225 psig0.7 to15.5 bar | Product Descriptions N/A Male NPT to Duolok Tube Fitting Proportional Relief Valve | End Connection Type N/A Male National Pipe Thread by Duolok Tube End |
| RL4D8-316 |
CAD
N/A
|
Body Material N/A 316 SS | Connection 1 - Type N/A Duolok Tube Fitting | Connection 1 - Size N/A 1/2 in | Connection 2 - Type N/A Duolok Tube Fitting | Connection 2 - Size N/A 1/2 in | Seal Material N/A FKM | Set Pressure Range N/A 10 to 225 psig0.7 to15.5 bar | Product Descriptions N/A Duolok Tube End Plug Proportional Relief Valve | End Connection Type N/A Duolok Tube End |
