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Department: InstrumentationX
Product Type: ValvesX
Product Sub-Type: Check ValvesX
Product: Relief Valve - Angle - RL4X
Coded label color: BrownX

Trade Name

A-LOK® (12) CPI™ (14)

Connection Type

Double ferrule compression (8) Male NPT / Double ferrule compression (4) Male NPT / Female NPT (6) Male NPT / Single ferrule compression (4) Single ferrule compression (10)

Inlet port 1

1/4" A-LOK compression (8) 1/4" CPI compression (10) 1/4" male NPT (14)

Outlet port 2

1/4" A-LOK compression (12) 1/4" CPI compression (14) 1/4" female NPT (6)

Lubricant

Krytox (1) Perfluorinated polyether (31)

Material - Seals

Ethylene propylene rubber (6) Fluorocarbon rubber (11) Highly fluorinated fluorocarbon rubber (4) Neoprene rubber (3) Nitrile rubber (8)

Operating Temperature

-10 F to 400 F (-23 C to 204 C) (11) -20 F to 200 F (-29 C to 93 C) (4) -30 F to 225 F (-34 C to 107 C) (8) -45 F to 250 F (-43 C to 121 C) (3) -70 F to 275 F (-57 C to 135 C) (6)

Special Cleaning

Cleaning for oxygen service (8)
Click Image to Zoom
Relief Valve - Angle - RL4Relief Valve - Angle - RL4

Relief Valve - Angle - RL4

Parker Angle Relief Valve - RL4 Series

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Showing 1 - 20 of 32  
Part # Availability Price/UOM
++ 4A-RL4A-BNT-SS-KB Out of Stock - Lead Time Required $315.56
++ 4A-RL4A-BNT-SS-KB-C3 Out of Stock - Lead Time Required $349.93
++ 4A-RL4A-EPRT-SS-KB Out of Stock - Lead Time Required $315.56
++ 4A-RL4A-EPRT-SS-KB-C3 Out of Stock - Lead Time Required $349.93
++ 4A-RL4A-KZT-SS-KB Out of Stock - Lead Time Required $411.38
++ 4A-RL4A-NET-SS-KB Out of Stock - Lead Time Required $315.56
++ 4A-RL4A-VT-SS-KB Out of Stock - Lead Time Required $316.94
++ 4A-RL4A-VT-SS-KB-C3 Out of Stock - Lead Time Required $339.49
++ 4M4A-RL4A-BNT-SS-KB Out of Stock - Lead Time Required $321.52
++ 4M4A-RL4A-EPRT-SS-KB Out of Stock - Lead Time Required $321.52
++ 4M4A-RL4A-VT-SS-KB Out of Stock - Lead Time Required $323.00
++ 4M4A-RL4A-VT-SS-KB-C3 Out of Stock - Lead Time Required $345.45
++ 4M4F-RL4A-BNT-SS-KB Out of Stock - Lead Time Required $308.18
++ 4M4F-RL4A-EPRT-SS-KB Out of Stock - Lead Time Required $308.18
++ 4M4F-RL4A-KZT-SS-KB Out of Stock - Lead Time Required $405.42
++ 4M4F-RL4A-NET-SS-KB Out of Stock - Lead Time Required $308.18
++ 4M4F-RL4A-VT-SS-KB Out of Stock - Lead Time Required $309.61
++ 4M4F-RL4A-VT-SS-KB-C3 Out of Stock - Lead Time Required $332.06
++ 4M4Z-RL4A-BNT-SS-KB Out of Stock - Lead Time Required $321.52
++ 4M4Z-RL4A-KZT-SS-KB Out of Stock - Lead Time Required $418.72
UOM Inlet port 1 Outlet port 2 Material - Seals Cracking pressure Material Country of Origin (COO) Harmonized Tariff (HTS)
EA 1/4" A-LOK compression 1/4" A-LOK compression Nitrile rubber 25-50 psig (1.7-3.4 bar) Stainless Steel Special request, please call for COO Special request, please call for HTS
EA 1/4" A-LOK compression 1/4" A-LOK compression Nitrile rubber 25-50 psig (1.7-3.4 bar) Stainless Steel Special request, please call for COO Special request, please call for HTS
EA 1/4" A-LOK compression 1/4" A-LOK compression Ethylene propylene rubber 25-50 psig (1.7-3.4 bar) Stainless Steel Special request, please call for COO Special request, please call for HTS
EA 1/4" A-LOK compression 1/4" A-LOK compression Ethylene propylene rubber 25-50 psig (1.7-3.4 bar) Stainless Steel Special request, please call for COO Special request, please call for HTS
EA 1/4" A-LOK compression 1/4" A-LOK compression Highly fluorinated fluorocarbon rubber 25-50 psig (1.7-3.4 bar) Stainless Steel Special request, please call for COO Special request, please call for HTS
EA 1/4" A-LOK compression 1/4" A-LOK compression Neoprene rubber 25-50 psig (1.7-3.4 bar) Stainless Steel Special request, please call for COO Special request, please call for HTS
EA 1/4" A-LOK compression 1/4" A-LOK compression Fluorocarbon rubber 25-50 psig (1.7-3.4 bar) Stainless Steel Special request, please call for COO Special request, please call for HTS
EA 1/4" A-LOK compression 1/4" A-LOK compression Fluorocarbon rubber 25-50 psig (1.7-3.4 bar) Stainless Steel Special request, please call for COO Special request, please call for HTS
EA 1/4" male NPT 1/4" A-LOK compression Nitrile rubber 25-50 psig (1.7-3.4 bar) Stainless Steel Special request, please call for COO Special request, please call for HTS
EA 1/4" male NPT 1/4" A-LOK compression Ethylene propylene rubber 25-50 psig (1.7-3.4 bar) Stainless Steel Special request, please call for COO Special request, please call for HTS
EA 1/4" male NPT 1/4" A-LOK compression Fluorocarbon rubber 25-50 psig (1.7-3.4 bar) Stainless Steel Special request, please call for COO Special request, please call for HTS
EA 1/4" male NPT 1/4" A-LOK compression Fluorocarbon rubber 25-50 psig (1.7-3.4 bar) Stainless Steel Special request, please call for COO Special request, please call for HTS
EA 1/4" male NPT 1/4" female NPT Nitrile rubber 25-50 psig (1.7-3.4 bar) Stainless Steel Special request, please call for COO Special request, please call for HTS
EA 1/4" male NPT 1/4" female NPT Ethylene propylene rubber 25-50 psig (1.7-3.4 bar) Stainless Steel Special request, please call for COO Special request, please call for HTS
EA 1/4" male NPT 1/4" female NPT Highly fluorinated fluorocarbon rubber 25-50 psig (1.7-3.4 bar) Stainless Steel Special request, please call for COO Special request, please call for HTS
EA 1/4" male NPT 1/4" female NPT Neoprene rubber 25-50 psig (1.7-3.4 bar) Stainless Steel Special request, please call for COO Special request, please call for HTS
EA 1/4" male NPT 1/4" female NPT Fluorocarbon rubber 25-50 psig (1.7-3.4 bar) Stainless Steel Special request, please call for COO Special request, please call for HTS
EA 1/4" male NPT 1/4" female NPT Fluorocarbon rubber 25-50 psig (1.7-3.4 bar) Stainless Steel Special request, please call for COO Special request, please call for HTS
EA 1/4" male NPT 1/4" CPI compression Nitrile rubber 25-50 psig (1.7-3.4 bar) Stainless Steel Special request, please call for COO Special request, please call for HTS
EA 1/4" male NPT 1/4" CPI compression Highly fluorinated fluorocarbon rubber 25-50 psig (1.7-3.4 bar) Stainless Steel Special request, please call for COO Special request, please call for HTS
4A-RL4A-BNT-SS-KB
Out of Stock - Lead Time Required
$315.56
View

UOM:

Inlet port 1:

Outlet port 2:

Material - Seals:

Cracking pressure:

Material:

Country of Origin (COO):

Harmonized Tariff (HTS):

EA

1/4" A-LOK compression

1/4" A-LOK compression

Nitrile rubber

25-50 psig (1.7-3.4 bar)

Stainless Steel

Special request, please call for COO

Special request, please call for HTS
4A-RL4A-BNT-SS-KB-C3
Out of Stock - Lead Time Required
$349.93
View

UOM:

Inlet port 1:

Outlet port 2:

Material - Seals:

Cracking pressure:

Material:

Country of Origin (COO):

Harmonized Tariff (HTS):

EA

1/4" A-LOK compression

1/4" A-LOK compression

Nitrile rubber

25-50 psig (1.7-3.4 bar)

Stainless Steel

Special request, please call for COO

Special request, please call for HTS
4A-RL4A-EPRT-SS-KB
Out of Stock - Lead Time Required
$315.56
View

UOM:

Inlet port 1:

Outlet port 2:

Material - Seals:

Cracking pressure:

Material:

Country of Origin (COO):

Harmonized Tariff (HTS):

EA

1/4" A-LOK compression

1/4" A-LOK compression

Ethylene propylene rubber

25-50 psig (1.7-3.4 bar)

Stainless Steel

Special request, please call for COO

Special request, please call for HTS
4A-RL4A-EPRT-SS-KB-C3
Out of Stock - Lead Time Required
$349.93
View

UOM:

Inlet port 1:

Outlet port 2:

Material - Seals:

Cracking pressure:

Material:

Country of Origin (COO):

Harmonized Tariff (HTS):

EA

1/4" A-LOK compression

1/4" A-LOK compression

Ethylene propylene rubber

25-50 psig (1.7-3.4 bar)

Stainless Steel

Special request, please call for COO

Special request, please call for HTS
4A-RL4A-KZT-SS-KB
Out of Stock - Lead Time Required
$411.38
View

UOM:

Inlet port 1:

Outlet port 2:

Material - Seals:

Cracking pressure:

Material:

Country of Origin (COO):

Harmonized Tariff (HTS):

EA

1/4" A-LOK compression

1/4" A-LOK compression

Highly fluorinated fluorocarbon rubber

25-50 psig (1.7-3.4 bar)

Stainless Steel

Special request, please call for COO

Special request, please call for HTS
4A-RL4A-NET-SS-KB
Out of Stock - Lead Time Required
$315.56
View

UOM:

Inlet port 1:

Outlet port 2:

Material - Seals:

Cracking pressure:

Material:

Country of Origin (COO):

Harmonized Tariff (HTS):

EA

1/4" A-LOK compression

1/4" A-LOK compression

Neoprene rubber

25-50 psig (1.7-3.4 bar)

Stainless Steel

Special request, please call for COO

Special request, please call for HTS
4A-RL4A-VT-SS-KB
Out of Stock - Lead Time Required
$316.94
View

UOM:

Inlet port 1:

Outlet port 2:

Material - Seals:

Cracking pressure:

Material:

Country of Origin (COO):

Harmonized Tariff (HTS):

EA

1/4" A-LOK compression

1/4" A-LOK compression

Fluorocarbon rubber

25-50 psig (1.7-3.4 bar)

Stainless Steel

Special request, please call for COO

Special request, please call for HTS
4A-RL4A-VT-SS-KB-C3
Out of Stock - Lead Time Required
$339.49
View

UOM:

Inlet port 1:

Outlet port 2:

Material - Seals:

Cracking pressure:

Material:

Country of Origin (COO):

Harmonized Tariff (HTS):

EA

1/4" A-LOK compression

1/4" A-LOK compression

Fluorocarbon rubber

25-50 psig (1.7-3.4 bar)

Stainless Steel

Special request, please call for COO

Special request, please call for HTS
4M4A-RL4A-BNT-SS-KB
Out of Stock - Lead Time Required
$321.52
View

UOM:

Inlet port 1:

Outlet port 2:

Material - Seals:

Cracking pressure:

Material:

Country of Origin (COO):

Harmonized Tariff (HTS):

EA

1/4" male NPT

1/4" A-LOK compression

Nitrile rubber

25-50 psig (1.7-3.4 bar)

Stainless Steel

Special request, please call for COO

Special request, please call for HTS
4M4A-RL4A-EPRT-SS-KB
Out of Stock - Lead Time Required
$321.52
View

UOM:

Inlet port 1:

Outlet port 2:

Material - Seals:

Cracking pressure:

Material:

Country of Origin (COO):

Harmonized Tariff (HTS):

EA

1/4" male NPT

1/4" A-LOK compression

Ethylene propylene rubber

25-50 psig (1.7-3.4 bar)

Stainless Steel

Special request, please call for COO

Special request, please call for HTS
4M4A-RL4A-VT-SS-KB
Out of Stock - Lead Time Required
$323.00
View

UOM:

Inlet port 1:

Outlet port 2:

Material - Seals:

Cracking pressure:

Material:

Country of Origin (COO):

Harmonized Tariff (HTS):

EA

1/4" male NPT

1/4" A-LOK compression

Fluorocarbon rubber

25-50 psig (1.7-3.4 bar)

Stainless Steel

Special request, please call for COO

Special request, please call for HTS
4M4A-RL4A-VT-SS-KB-C3
Out of Stock - Lead Time Required
$345.45
View

UOM:

Inlet port 1:

Outlet port 2:

Material - Seals:

Cracking pressure:

Material:

Country of Origin (COO):

Harmonized Tariff (HTS):

EA

1/4" male NPT

1/4" A-LOK compression

Fluorocarbon rubber

25-50 psig (1.7-3.4 bar)

Stainless Steel

Special request, please call for COO

Special request, please call for HTS
4M4F-RL4A-BNT-SS-KB
Out of Stock - Lead Time Required
$308.18
View

UOM:

Inlet port 1:

Outlet port 2:

Material - Seals:

Cracking pressure:

Material:

Country of Origin (COO):

Harmonized Tariff (HTS):

EA

1/4" male NPT

1/4" female NPT

Nitrile rubber

25-50 psig (1.7-3.4 bar)

Stainless Steel

Special request, please call for COO

Special request, please call for HTS
4M4F-RL4A-EPRT-SS-KB
Out of Stock - Lead Time Required
$308.18
View

UOM:

Inlet port 1:

Outlet port 2:

Material - Seals:

Cracking pressure:

Material:

Country of Origin (COO):

Harmonized Tariff (HTS):

EA

1/4" male NPT

1/4" female NPT

Ethylene propylene rubber

25-50 psig (1.7-3.4 bar)

Stainless Steel

Special request, please call for COO

Special request, please call for HTS
4M4F-RL4A-KZT-SS-KB
Out of Stock - Lead Time Required
$405.42
View

UOM:

Inlet port 1:

Outlet port 2:

Material - Seals:

Cracking pressure:

Material:

Country of Origin (COO):

Harmonized Tariff (HTS):

EA

1/4" male NPT

1/4" female NPT

Highly fluorinated fluorocarbon rubber

25-50 psig (1.7-3.4 bar)

Stainless Steel

Special request, please call for COO

Special request, please call for HTS
4M4F-RL4A-NET-SS-KB
Out of Stock - Lead Time Required
$308.18
View

UOM:

Inlet port 1:

Outlet port 2:

Material - Seals:

Cracking pressure:

Material:

Country of Origin (COO):

Harmonized Tariff (HTS):

EA

1/4" male NPT

1/4" female NPT

Neoprene rubber

25-50 psig (1.7-3.4 bar)

Stainless Steel

Special request, please call for COO

Special request, please call for HTS
4M4F-RL4A-VT-SS-KB
Out of Stock - Lead Time Required
$309.61
View

UOM:

Inlet port 1:

Outlet port 2:

Material - Seals:

Cracking pressure:

Material:

Country of Origin (COO):

Harmonized Tariff (HTS):

EA

1/4" male NPT

1/4" female NPT

Fluorocarbon rubber

25-50 psig (1.7-3.4 bar)

Stainless Steel

Special request, please call for COO

Special request, please call for HTS
4M4F-RL4A-VT-SS-KB-C3
Out of Stock - Lead Time Required
$332.06
View

UOM:

Inlet port 1:

Outlet port 2:

Material - Seals:

Cracking pressure:

Material:

Country of Origin (COO):

Harmonized Tariff (HTS):

EA

1/4" male NPT

1/4" female NPT

Fluorocarbon rubber

25-50 psig (1.7-3.4 bar)

Stainless Steel

Special request, please call for COO

Special request, please call for HTS
4M4Z-RL4A-BNT-SS-KB
Out of Stock - Lead Time Required
$321.52
View

UOM:

Inlet port 1:

Outlet port 2:

Material - Seals:

Cracking pressure:

Material:

Country of Origin (COO):

Harmonized Tariff (HTS):

EA

1/4" male NPT

1/4" CPI compression

Nitrile rubber

25-50 psig (1.7-3.4 bar)

Stainless Steel

Special request, please call for COO

Special request, please call for HTS
4M4Z-RL4A-KZT-SS-KB
Out of Stock - Lead Time Required
$418.72
View

UOM:

Inlet port 1:

Outlet port 2:

Material - Seals:

Cracking pressure:

Material:

Country of Origin (COO):

Harmonized Tariff (HTS):

EA

1/4" male NPT

1/4" CPI compression

Highly fluorinated fluorocarbon rubber

25-50 psig (1.7-3.4 bar)

Stainless Steel

Special request, please call for COO

Special request, please call for HTS
Showing 1 - 20 of 32
Parker RL4 Relief Valves are designed such that when the upstream pressure exceeds the closing force exerted by the spring, the lower stem opens, permitting flow through the valve. Flow through the valve increases proportionately to the increase in upstream pressure. Pressure settings are externally adjustable while the valve is in operation. Seven different spring ranges provide greater system sensitivity and enhanced performance.

Application: In the key markets of chemical & refining, food, beverage & dairy, medical & dental, microelectronics, oil & gas, and power generation.
Parker Instrumentation Check Valves
Parker Instrumentation Check Valves
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