Product Overview
The Rexroth FD 25 PA21/B04V (Material No. R900542433) is a pilot-operated load holding valve (also referred to as a load control or counterbalance valve) belonging to the Rexroth FD series of pressure control valves. It is engineered to prevent uncontrolled movement or dropping of a load in the event of a pressure loss, hose burst, or system shutdown, while simultaneously providing smooth, controlled lowering of the actuator. The valve operates on a differential-area spool principle: a spring-loaded poppet or spool holds the load pressure at the consumer port until a pilot pressure signal, derived from the opposite side of the circuit, shifts the valve open proportionally. This design ensures leak-free load holding in the blocked position and precise, load-independent lowering speed. The FD 25 PA21/B04V is a direct-fit, cartridge-style pressure control valve used in demanding industrial and mobile hydraulic systems where safety, stability, and repeatable load control are critical.
Technical Specifications
| Parameter | Specification / Feature |
|---|---|
| Component Type | Hydraulic Valve — Pressure Control Valve (Load Holding / Counterbalance Valve) |
| Model Designation | FD 25 PA21/B04V |
| Material / Part Number | R900542433 |
| Nominal Size | NG25 (DIN 24342 cartridge interface) |
| Operating Pressure | Standard Industrial Grade (up to rated 350 bar working pressure) |
| Actuation Principle | Pilot-operated, spring-loaded, load-compensated spool |
| Mounting & Connection | Standard ISO / Manufacturer Cartridge Interface (slip-in cartridge) |
| Sealing | NBR / FKM seals for mineral oil-based hydraulic fluids |
Engineering Features & Advantages
- Precision Load Holding: The spring-biased spool maintains a leak-tight seal in the blocked position, preventing load drift or drop even during extended standstill periods or sudden pressure loss.
- Pilot-Controlled Lowering: Proportional opening via external pilot pressure delivers smooth, load-independent lowering speeds, eliminating jerking or cavitation in the actuator.
- Burst & Hose Failure Protection: Integrated safety function instantly blocks the consumer port if supply pressure collapses, safeguarding personnel and equipment.
- Industrial Reliability: Built for continuous operation under severe industrial conditions, with hardened spool and seat surfaces for long service life and minimal internal leakage.
- Direct Fit Replacement: Exact dimensional and functional compatibility with original Rexroth OEM standards, ensuring drop-in interchangeability without modification.
Typical Industrial Applications
The Rexroth FD 25 PA21/B04V load holding valve is deployed in heavy industrial scenarios requiring secure load retention and controlled motion, including: plastic injection molding machines (clamping and ejector circuits), metall
PRODUCT IMAGES
REXROTH FD 25 PA21/B04V / R900542433 Load Holding Valve
⚡ Emergency Plant Maintenance & Ready-to-Ship Notice:
- Authentic & Fully Tested: 100% bench tested for hydraulic response, pressure rating, and null-bias stability before dispatch.
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- Peace of Mind: Covered by our 12-Month Replacement Warranty.
Shop the genuine REXROTH FD 25 PA21/B04V / R900542433 Pressure Compensated Flow Control Valve. This German-made hydraulic component features a pressure-compensated design, delivering leak-free, reliable fluid control for heavy-duty industrial systems.
