HDC Pressure Valves: A Cost-Effective Alternative to Rexroth, Yuken, Parker & Eaton Vickers
Pressure valves are the workhorses of any hydraulic circuit — relief, reducing, sequence, unloading, and balanced-piston valves that protect your system and control how it behaves under load. They're also some of the most commonly replaced valves on the shop floor, which means they're where legacy-brand pricing hurts the most.
Hydrodynamics stocks the full HDC pressure valve range, built to the same industry-standard mounting and function classes as Rexroth, Yuken, Parker, and Eaton Vickers pressure valves — at a significantly lower landed cost, with local stock availability.
Below is our working cross-reference. If your drawing, spares list, or old valve nameplate shows any of these legacy references, there's a good chance an HDC equivalent already sits on our shelf.
Direct & pilot-operated relief valves
Function | HDC Code | Rexroth | Yuken | Parker | Eaton Vickers |
Direct operated relief valve | DBD...1XJ | DBD | DT / DCG | RDA | RV1 / RV2 |
Pilot relief / solenoid pilot relief | DB/DBW...5XJ | DB/DBW | BG / BSG / BT / BST | R4V / SV10 | CG/CT + solenoid vent (CTV) |
Remote pressure relief valve | DBT/DBWT...3XJ | DBT/DBWT | remote control relief (RG/DT) | remote/vent relief option | remote control relief (CT+vent) |
Balanced valve | DC...1XJ | DC | BG (balanced piston) | R4V (balanced piston) | CG/CS/CT (balanced piston) |
Modular balanced valve | PHF | PHF | BG (balanced piston) | R4V (balanced piston) | CG/CS/CT (balanced piston) |
HDC Pressure reducing valves
Function | HDC Code | Rexroth | Yuken | Parker | Eaton Vickers |
Pilot operated pressure reducing valve | DR...5XJ | DR | RG | PR / PRD | XG / XV |
Direct operated pressure reducing valve | DR5DP...1XJ / DR6DP...5XJ / DR10DP...4XJ | DR5DP / DR6DP / DR10DP | RG | PR / PRD | XG / XV |
Pilot operated pressure reducing valve | DR10K...-3XJ | DR10 | RG | PR / PRD | XG / XV |
Pilot operated pressure reducing valve | DR20K...-1XJ / DR...-4XJ | DR20 / DR..4X | RG | PR / PRD | XG / XV |
3-way pressure reducing valve | 3DR10P...6XJ | 3DR10 | FG (limited match) | 3-way reducing (limited match) | 3-way reducing (limited match) |
Modular (stackable) pressure valves
Function | HDC Code | Rexroth |
Modular pressure relief valve, NG6 | ZDB/Z2DB6...4XJ | ZDB6/Z2DB6 |
Modular pressure relief valve, NG10 | ZDB/Z2DB10...4XJ | ZDB10/Z2DB10 |
Modular pressure relief valve, vented | ZDB/Z2DB...V...3XJ | ZDB/Z2DB..V |
Modular pressure reducing valve, NG6 | ZDR6DP0-4XJ / ZDR6D...4XJ | ZDR6DP / ZDR6 |
Modular pressure reducing valve, NG10 | ZDR10D...5XJ | ZDR10 |
Modular pressure sequence valve | ZDZ6DP-1XJ | ZDZ6DP |
Modular valves are strongly standardised on Rexroth's stacking pattern; Yuken, Parker, and Eaton Vickers equivalents exist but are a looser functional match at this size — confirm your stack bolt pattern before ordering.
Sequence & unloading valves
Function | HDC Code | Rexroth | Yuken | Parker | Eaton Vickers |
Direct operated pressure sequence valve | DZ5DP...1XJ / DZ6DP...5XJ / DZ10DP...4XJ | DZ5DP / DZ6DP / DZ10DP | JG (sequence) | RZ / sequence valve | CV sequence valve |
Pilot operated pressure sequence valve | DZ...5XJ | DZ | JG (sequence) | RZ / sequence valve | CV sequence valve |
Pilot operated unloading relief valve | DA/DAW...3XJ / DA/DAW...5XJ | DA/DAW | UGC (unloading) | unloading relief valve | CGU (unloading relief) |
Multistage & cartridge pilot relief valves
Function | HDC Code | Rexroth |
Cartridge pilot pressure relief valve | DB...K...XJ | DBDS / DB..K |
2/3-stage electro-hydraulic pilot relief | DB2U...5XJ / DB3U...5XJ | DB2U / DB3U |
These are a weaker cross-brand match — Yuken, Parker, and Eaton Vickers don't carry a close direct equivalent at cartridge/multistage level, so Rexroth is the primary reference point here.
Explosion-proof (Ex-rated) pressure valves
For hazardous-area installations, HDC's G-prefixed pressure valves mirror the standard range's function in an explosion-proof housing:
Function | HDC Code | Rexroth |
Ex-proof multistage pilot relief | G-DB2U...-5XJ / G-DB3U...-5XJ | G-DB2U / G-DB3U |
Ex-proof solenoid pilot relief | G-DBW...5XJ | G-DBW |
Ex-proof pilot operated unloading relief | G-DAW...5XJ | G-DAW |
A note on how to read this table
Not every valve on this list is a like-for-like swap. Where we've matched an HDC valve to a Rexroth, Yuken, Parker, or Eaton Vickers family, it means they serve the same function in the same general size class — not that they share an internal design or are guaranteed interchangeable without checking. Some functions (cartridge relief, multistage pilot relief, 3-way reducing/sequence) simply aren't standardised in the same way across every brand, so the closest match may only be "close" in what it does, not how it mounts.
Before you order a pressure valve to replace an existing legacy-brand unit, send us:
The pressure setting/range you need
Cavity or manifold mounting pattern
Direct-acting vs. pilot-operated, and any modular stack requirement
Coil voltage (for solenoid pilot-relief and unloading valves)
We'll confirm the right HDC configuration before you commit to an order.
Why source your pressure valves from Hydrodynamics
Local stock on the standard relief, reducing, sequence, and modular pressure valve ranges — no long OEM lead times for routine replacements.
Lower landed cost than Rexroth, Yuken, Parker, or Eaton Vickers equivalents, at industrial duty specification.
Configuration checked before dispatch — send your nameplate photo or drawing and we'll verify fit.
Get a quote or a technical cross-check: www.hydrodynamics.co.za
Rexroth, Yuken, Parker, and Eaton Vickers, and the model designations referenced above, are trademarks of their respective owners and are used here for cross-reference and compatibility purposes only. Hydrodynamics is an independent supplier of HDC hydraulic valves and is not an authorised distributor of, endorsed by, or affiliated with Rexroth, Yuken, Parker, or Eaton Vickers. Always verify exact configuration, pressure setting, porting, and cavity dimensions before specifying a replacement valve.
