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Single In-Line Relief Valves - Direct Acting

Direct Acting Pressure Relief Cartridges (RD*A)
Applications
This patented, direct acting, differential area valve with broad operating characteristics is adjustable to 5000 psi. Because of its exceptional performance, this relief cartridge should be considered for applications where fast response, dirt tolerance and leakage are critical. Examples of this type of application would include overshoot protection of fixed and variable volume pumps and shock protection of cylinders and motors.
Design Concepts and Features
  • Maximum leakage is 10 drops/min. at reseat
  • Reseat equals 90% of cracking pressure
  • Ability to operate more reliably in contaminated applications
  • Not recommended for repeated adjustment because of high adjustment effort.

Part Number
VALVE MATERIAL
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PORTS 1 AND 2
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RECCOM. GPM
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A
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B
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C
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RDDA-LAN-FEB
Aluminum
3/8" NPT
9
5.32
1.75
1.75
RDDA-LAN-FEC
Aluminum
1/2" NPT
15
5.32
1.75
1.75
RDFA-LAN-CED
Aluminum
3/4" NPT
30
6.25
2.50
2.50
RDFA-LAN-CEE
Aluminum
1" NPT
45
6.25
2.50
2.50
RDHA-LAN-IEF
Aluminum
1-1/4" NPT
70
6.94
3.00
3.00
RDDA-LAN-FEI
Aluminum
6 SAE
9
5.32
1.75
1.75
RDDA-LAN-FEJ
Aluminum
8 SAE
15
5.32
1.75
1.75
RDFA-LAN-CEL
Aluminum
12 SAE
30
6.25
2.50
2.50
RDFA-LAN-CEM
Aluminum
16 SAE
45
6.25
2.50
2.50
RDDA-LAN-FEB/S
Steel
3/8" NPT
9
5.32
1.75
1.75
RDDA-LAN-FEC/S
Steel
1/2" NPT
15
5.32
1.75
1.75
RDFA-LAN-CED/S
Steel
3/4" NPT
30
6.25
2.50
2.50
RDFA-LAN-CEE/S
Steel
1" NPT
45
6.25
2.50
2.50
RDHA-LAN-IEF/S
Steel
1-1/4" NPT
70
6.94
3.00
3.00
RDDA-LAN-FEI/S
Steel
6 SAE
9
5.32
1.75
1.75
RDDA-LAN-FEJ/S
Steel
8 SAE
15
5.32
1.75
1.75
RDFA-LAN-CEL/S
Steel
12 SAE
30
6.25
2.50
2.50
RDFA-LAN-CEM/S
Steel
16 SAE
45
6.25
2.50
2.50

Gauge Port - 1/4" All Valves * 3000 psi max pressure (Aluminum) **5000 psi max pressure (Steel)