A pilot operated spool relief valve fitted in a hydraulic manifold block: when circuit pressure exceeds the setting, it opens and returns excess oil to the tank, capping system pressure and protecting the pump, cylinders and piping. The RAH201S30 adjusts from 20.7 to 207 bar; the RAH201S10 from 6.9 to 69 bar.
The Parker RAH201 series is a pilot operated, spool type relief valve from Parker’s Hydraulic Cartridge Systems division. It screws into a C20-2 cavity and is common in integrated manifolds on hydraulic power units and hydraulic machines. In the model number, “S” means screw adjustment, the final “30” or “10” is the pressure range class (3,000 psi / 1,000 psi), and no seal code means nitrile seals.
A JIAHON affiliated company supplies customers throughout Taiwan. When asking for a quote, send the full model number or a photo of the nameplate; our technical staff will check it before quoting.
Specifications
| Item | RAH201S30 | RAH201S10 |
|---|---|---|
| Type | Pilot operated, spool type relief valve | Pilot operated, spool type relief valve |
| Mounting | Screw-in cartridge, C20-2 cavity | Screw-in cartridge, C20-2 cavity |
| Adjustment range | 20.7–207 bar (300–3,000 psi) | 6.9–69 bar (100–1,000 psi) |
| Factory setting | 103.5 bar (1,500 psi) @ 37.5 L/min | 34.5 bar (500 psi) @ 37.5 L/min |
| Rated flow | 379 L/min (100 GPM) | 379 L/min (100 GPM) |
| Maximum inlet pressure | 380 bar (5,500 psi) | 380 bar (5,500 psi) |
| Adjustment | S = screw adjustment (the series also has K knob and T tamper-resistant cap) | Same |
| Seals | Nitrile (standard); V = fluorocarbon (option) | Same |
| Fluids | Mineral oil or synthetic hydraulic fluids with lubricating properties, viscosity 6–420 cSt | Same |
| Temperature | −34 to +121 °C (nitrile seals) | Same |
| Filtration | ISO 4406 18/16/13 | Same |
Source: Parker Hannifin Hydraulic Cartridge Systems catalog HY15-3503 (RAH201, pages PC31–PC32). Actual specs are as shown in the maker’s catalog and on the nameplate.
Applications
- Main relief on hydraulic power units (HPU): caps the pump outlet pressure
- Pressure protection in the hydraulic circuits of presses, injection molding machines and die casting machines
- System pressure setting on integrated manifolds
- Maintenance replacement: drop-in replacement in manifolds originally fitted with RAH201
Selection and quote points
- Check the system pressure setting: choose RAH201S30 for 20.7–207 bar, RAH201S10 for 6.9–69 bar.
- Confirm the cavity is C20-2 and flow is within 379 L/min.
- If oil runs hot or you use a special hydraulic fluid, tell us whether you need fluorocarbon (V) seals.
- Send the full model number or a nameplate photo, and our technical staff will check it before quoting.
Not suitable for
The RAH201 is a cartridge relief valve for hydraulic circuits. It is not a spring-loaded safety valve for boilers, steam or compressed air receivers; safety valves on pressure vessels must be certified types required by law, so do not use this product in their place.
Trademarks: Parker and the model names on this page are trademarks or model names of their owner, used here only to identify the products. JIAHON is not the authorized distributor of Parker in Taiwan.
Request a quote
Send the full model number or a nameplate photo, seal type and quantity. Request a quote →