DOJR8-HN – Sun Hydraulics Normally open, balanced poppet, logic element with integral T-8A control cavity – vent-to-close
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Part number: DOJR8HN · DOJR8-HN · DOJR8 HN
Normally open, balanced poppet, logic element with integral T-8A control cavity – vent-to-close. Cavity T-24A, capacity 120 gpm (480 L/min.). Genuine Sun Hydraulics cartridge — MultiFlow is an authorized distributor.
DOJR8-HN overview
DOJR8HN (DOJR8-HN, DOJR8 HN) is a Sun Hydraulics Sun Hydraulics Normally open, balanced poppet, logic element with integral T-8A control cavity - vent-to-close, rated 120 gpm (480 L/min.) and installed in cavity T-24A. MultiFlow supplies genuine Sun Hydraulics cartridges in the UAE, GCC and India — use Add to Enquiry above for availability and a quotation.
Ordering codes
Pick the code that matches the material and finish you need. Add it to your enquiry above, or tap a code to select it.
| DOJR8HN | Buna-N sealsBuna-N |
|---|---|
| DOJR8HV | Viton sealsViton |
| DOJR8HE | EPDM sealsEPDM |
Specifications
| Cavity | T-24A |
|---|---|
| Series | 4 |
| Capacity | 120 gpm (480 L/min.) |
| Maximum Operating Pressure | 5000 psi (350 bar) |
| Minimum Pilot Pressure Required to Shift Valve | 300 psi (20 bar) |
| Control Pilot Flow | See Performance Data |
| Maximum Valve Leakage at 110 SUS (24 cSt) | 10 drops/min.@5000 psi (0,7 cc/min.@350 bar) |
| Pilot Control Cavity | T-8A |
| Pilot Control Valve Installation Torque | 20 - 25 lbf ft (27 - 33 Nm) |
| Pilot Control Valve Hex Size | 7/8 in. (22,2 mm) |
| Valve Hex Size | 1 5/8 in. (41,3 mm) |
| Valve Installation Torque | 350 - 375 lbf ft (474 - 508 Nm) |
| Model Weight | 3.50 lb (1,60 kg) |
| Seal kit - Cartridge | Viton: 990024006 |
Compound cartridge (pilot and main stage) assembly information is provided for reference only. Cartridges must be ordered separately and assembled at point of use.
How to read DOJR8HN
Sun part numbers are the model followed by one code per option. Hyphens, slashes and spaces are only dividers, so DOJR8HN, DOJR8-HN, DOJR8 HN are the same part.
| Model | DOJR8 — Sun Hydraulics Normally open, balanced poppet, logic element with integral T-8A control cavity - vent-to-close |
|---|---|
| Minimum Pilot Pressure | H — 300 psi (20 bar) |
| Seal Material | N — Buna-N |
| Material / coating | Add /AP (stainless steel, passivated) or /LH (mild steel, zinc-nickel) to the end; no suffix is the standard finish. |
Minimum Pilot Pressure options
- H — 300 psi (20 bar)
Seal Material options
- N — Buna-N
- V — Viton
- E — EPDM
Manifold & standard assemblies
Sun manifolds for cavity T-24A (74)
- Q46 Sun Hydraulics Ninety degree with reverse flow check – reducing Line mount manifoldDOJR8HN-Q46 — request assembly
- Q48 Sun Hydraulics Ninety degree with reverse flow check – reducing Line mount manifoldDOJR8HN-Q48 — request assembly
- Q4D Sun Hydraulics Ninety degree with reverse flow check – reducing Line mount manifoldDOJR8HN-Q4D — request assembly
- Q4E Sun Hydraulics Ninety degree with reverse flow check – reducing Line mount manifoldDOJR8HN-Q4E — request assembly
- Q4F Sun Hydraulics Ninety degree with reverse flow check – reducing Line mount manifoldDOJR8HN-Q4F — request assembly
- Q4L Sun Hydraulics Ninety degree with reverse flow check – reducing Line mount manifoldDOJR8HN-Q4L — request assembly
- Q4M Sun Hydraulics Ninety degree with reverse flow check – reducing Line mount manifoldDOJR8HN-Q4M — request assembly
- Q4N Sun Hydraulics Ninety degree with reverse flow check – reducing Line mount manifoldDOJR8HN-Q4N — request assembly
- Q4R Sun Hydraulics Ninety degree with reverse flow check – reducing Line mount manifoldDOJR8HN-Q4R — request assembly
- Q4S Sun Hydraulics Ninety degree with reverse flow check – reducing Line mount manifoldDOJR8HN-Q4S — request assembly
- Q4W Sun Hydraulics Ninety degree with reverse flow check – reducing Line mount manifoldDOJR8HN-Q4W — request assembly
- Q4X Sun Hydraulics Ninety degree with reverse flow check – reducing Line mount manifoldDOJR8HN-Q4X — request assembly
Technical features
- Unique balanced construction provides predictable switching with 5000 psi (350 bar) at port 1 and port 2. Switching will only occur when both a minimum pilot pressure of 400 psi (30 bar) is present and pilot control valve is open.
- Cartridges configured with EPDM seals are for use in systems with phosphate ester fluids. Exposure to petroleum based fluids, greases and lubricants will damage the seals.
- These valves are hydraulically balanced between port 1 and port 2.
- Port 1 and port 2 are fully sealed from port 3 and port 4. Ports 3 and 4 are positively sealed.
- Any backpressure at the drain port is directly additive to the required pilot pressure for reliable operation.
- Leakage rate between port 1 and port 2 is very low, typically less than 10 drops/min. at 5000 psi (0,7 cc/min at 350 bar).
- NOTE: With the -8 control option, the main stage valve should first be installed to the correct torque value. The T-8A pilot control valve should then be installed into the main stage valve to its required torque value.
- The -8 control option allows the pilot control valve to be incorporated directly into the end of the logic cartridge via the T-8A cavity. These pilot control cartridges are sold separately and include electro-proportional, solenoid, air pilot, and hydraulic pilot operation. See Pilot Control Cartridges.
- Valve will open when the pilot pressure falls below 145 psi (10 bar).
- All ports will accept 5000 psi (350 bar).
- Incorporates the Sun floating style construction to minimize the possibility of internal parts binding due to excessive installation torque and/or cavity/cartridge machining variations.
Drawings, symbol & performance curves
Downloads
Technical reference sheets
Frequently asked questions
Is DOJR8HN the same as DOJR8-HN?
Yes. Sun Hydraulics writes this part number as DOJR8HN. It is the model DOJR8 followed by the configuration code; hyphens, slashes and spaces are only dividers, so DOJR8HN, DOJR8-HN, DOJR8 HN all refer to the same product.
Do you supply DOJR8HN in the UAE, GCC and India?
Yes. MultiFlow supplies genuine Sun Hydraulics cartridges, including DOJR8HN, to customers in the UAE, the wider GCC and India. Use Add to Enquiry on this page for availability, lead time and a quotation.
Can I get the datasheet and CAD files?
Yes. The datasheet, technical reference sheets and CAD files (DXF, DWG, STP) are listed in the Downloads section of this page.
I need to discharge a large accumulator. How can I increase the capacity of my discharge circuit?
Because of the very high ratio, the COFO has limited capacity. The discharge path is across a .050 inch (1,3 mm) diameter orifice. If you have large accumulators combined with low precharge pressures, this may not discharge the energy quickly enough. Using the COFO XDN cartridge in conjunction with an LODA XDN will provide capacity for larger applications.
How big is a drop of hydraulic oil?
There are exactly 250 Sun drops in a cubic inch or 15 in a cc.
Direct acting or pilot operated - what do I use?
Direct-acting valves are used to prevent over pressure, and pilot-operated valves are used to regulate pressure. If you are unsure, use a direct-acting valve. Sun's direct acting valves are very fast, dirt tolerant, stable, and robust. Sun's pilot-operated valves are moderately fast, they have a low pressure rise vs. flow curve, and they are easy to adjust.
What parts of the Sun cartridge valve are field serviceable?
Only external seals are serviceable. Sun offers replacement seal kits for all cartridge models. The applicable kit part number can be found in the product page's Technical Data table or by using our Cartridge Seal Kit search function located under Accessories. Please note: Converting the external seals from one material to another does not ensure fluid compatibility with that material due to the existence of internal seals within the cartridge.
Manufacturer reference: https://www.sunhydraulics.com/model/DOJR8
