Product Overview
The PARKER HRP 4 V (part number 3225121) is a pilot operated check valve belonging to Parker Hannifin’s HRP series of modular sandwich valves. Designed for manifold and subplate mounting in accordance with ISO 4401 / CETOP / DIN 24340 interface standards, this valve functions as a leak-free load-holding element within hydraulic circuits. In its normal de-energized state, the valve blocks flow in one direction while permitting free flow in the opposite direction. When pilot pressure is applied to the integral pilot port, the internal poppet is mechanically unseated, allowing reverse flow to pass. This pilot operated check valve is engineered for precise flow control, load holding, and actuator locking functions in demanding industrial hydraulic systems.
Technical Specifications
| Parameter | Specification / Feature |
|---|---|
| Component Type | Pilot Operated Check Valve (Modular / Sandwich Valve) |
| Model Designation | HRP 4 V / 3225121 |
| Manufacturer | Parker Hannifin |
| Operating Pressure | Up to 350 bar (standard industrial grade) |
| Nominal Flow Rate | Up to 60 L/min (NG6 / CETOP 3 size) |
| Pilot Ratio | Standard pilot ratio (typically 1:3 or 1:4.5 depending on configuration) |
| Mounting & Connection | ISO 4401 / CETOP 3 / DIN 24340 NG6 subplate or manifold mounting |
| Sealing Material | NBR (Buna-N) standard; FKM available for high-temperature applications |
| Fluid Compatibility | Mineral oil based hydraulic fluids (HL, HLP, HV) per DIN 51524 |
| Operating Temperature Range | -20°C to +80°C (NBR seals) |
Engineering Features & Advantages
- Leak-Free Load Holding: The precision-ground poppet and seat design ensures zero internal leakage in the blocked direction, providing reliable load holding and preventing actuator drift in vertical or clamping applications.
- Pilot-Assisted Reverse Flow: External pilot pressure mechanically unseats the poppet, enabling controlled reverse flow with minimal pressure loss and precise metering characteristics.
- Industrial Reliability: Built for continuous operation under severe industrial conditions, with robust construction and wear-resistant internal components for extended service life.
- Direct Fit Replacement: Precision-manufactured to original PARKER specifications for direct replacement, minimising downtime and eliminating fitment issues.
Typical Industrial Applications
This pilot operated check valve is engineered for precise flow control, load holding, and actuator locking functions in demanding industrial hydraulic systems.
PRODUCT IMAGES
PARKER HRP 4 V / 3225121 Pilot Operated Check 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.
- Fast Dispatch: In-stock units ready for same-day dispatch via DHL / FedEx Express directly to your plant.
- Pre-Shipment Verification: High-definition photos, video testing runs, and serial number verification provided prior to shipment.
- Peace of Mind: Covered by our 12-Month Replacement Warranty.
Shop the genuine PARKER HRP 4 V / 3225121 Solenoid Directional Control Valve. This Germany-made hydraulic component features a robust spool design, delivering leak-free, reliable fluid control for heavy-duty industrial systems.
