DKDR8HN – Sun Hydraulics Normally closed, balanced poppet, logic element with integral T-8A control cavity - vent-to-open, Buna-N seals
Part number: DKDR8HN · DKDR8-HN · DKDR8 HN
Normally closed, balanced poppet, logic element with integral T-8A control cavity – vent-to-open. Cavity T-21A, capacity 15 gpm (60 L/min.). Genuine Sun Hydraulics cartridge — MultiFlow is an authorized distributor.
DKDR8-HN overview
DKDR8HN (DKDR8-HN, DKDR8 HN) is a Sun Hydraulics Sun Hydraulics Normally closed, balanced poppet, logic element with integral T-8A control cavity - vent-to-open, rated 15 gpm (60 L/min.) and installed in cavity T-21A. 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.
| DKDR8HN | Buna-N sealsBuna-N |
|---|---|
| DKDR8HV | Viton sealsViton |
Specifications
| Cavity | T-21A |
|---|---|
| Series | 1 |
| Capacity | 15 gpm (60 L/min.) |
| Maximum Operating Pressure | 5000 psi (350 bar) |
| Minimum Pilot Pressure Required to Shift Valve | 400 psi (28 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 | 7/8 in. (22,2 mm) |
| Valve Installation Torque | 30 - 35 lbf ft (41 - 47 Nm) |
| Model Weight | .35 lb (0,15 kg) |
| Seal kit - Cartridge | Viton: 990021006 |
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 DKDR8HN
Sun part numbers are the model followed by one code per option. Hyphens, slashes and spaces are only dividers, so DKDR8HN, DKDR8-HN, DKDR8 HN are the same part.
| Model | DKDR8 — Sun Hydraulics Normally closed, balanced poppet, logic element with integral T-8A control cavity - vent-to-open |
|---|---|
| Minimum Pilot Pressure | H — 400 psi (28 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 — 400 psi (28 bar)
Seal Material options
- N — Buna-N
- V — Viton
Manifold & standard assemblies
Sun manifolds for cavity T-21A (54)
- M4A Sun Hydraulics Ninety degree with reverse flow check – reducing Line mount manifoldDKDR8HN-M4A — request assembly
- M4B Sun Hydraulics Ninety degree with reverse flow check – reducing Line mount manifoldDKDR8HN-M4B — request assembly
- M4C Sun Hydraulics Ninety degree with reverse flow check – reducing Line mount manifoldDKDR8HN-M4C — request assembly
- M4I Sun Hydraulics Ninety degree with reverse flow check – reducing Line mount manifoldDKDR8HN-M4I — request assembly
- M4J Sun Hydraulics Ninety degree with reverse flow check – reducing Line mount manifoldDKDR8HN-M4J — request assembly
- M4K Sun Hydraulics Ninety degree with reverse flow check – reducing Line mount manifoldDKDR8HN-M4K — request assembly
- M4T Sun Hydraulics Ninety degree with reverse flow check – reducing Line mount manifoldDKDR8HN-M4T — request assembly
- M4U Sun Hydraulics Ninety degree with reverse flow check – reducing Line mount manifoldDKDR8HN-M4U — request assembly
- M4V Sun Hydraulics Ninety degree with reverse flow check – reducing Line mount manifoldDKDR8HN-M4V — request assembly
- MAA Sun Hydraulics Ninety degree Line mount manifoldDKDR8HN-MAA — request assembly
- MAB Sun Hydraulics Ninety degree Line mount manifoldDKDR8HN-MAB — request assembly
- MAC Sun Hydraulics Ninety degree Line mount manifoldDKDR8HN-MAC — 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.
- 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).
- Valve will reseat when the pilot pressure falls below 145 psi (10 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.
- 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
Datasheet
Technical reference sheets
- 999-901-334 (PDF 344 KB)
- FloatingStyleScrewInCartridge2 (PDF 1 MB)
- TT_US_Cavity-New (PDF 522 KB)
- TT_US_Logics-New (PDF 886 KB)
CAD files
Frequently asked questions
Is DKDR8HN the same as DKDR8-HN?
Yes. Sun Hydraulics writes this part number as DKDR8HN. It is the model DKDR8 followed by the configuration code; hyphens, slashes and spaces are only dividers, so DKDR8HN, DKDR8-HN, DKDR8 HN all refer to the same product.
Do you supply DKDR8HN in the UAE, GCC and India?
Yes. MultiFlow supplies genuine Sun Hydraulics cartridges, including DKDR8HN, 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.
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.
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.
What parts of the Sun cartridge valve are field serviceable?
Manufacturer reference: https://www.sunhydraulics.com/model/DKDR8
