DOHC-EHN – Sun Hydraulics Normally open, balanced poppet, logic element – pilot-to-close
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Part number: DOHCEHN · DOHC-EHN · DOHC EHN
Normally open, balanced poppet, logic element – pilot-to-close. Cavity T-17A, capacity 60 gpm (240 L/min.). Genuine Sun Hydraulics cartridge — MultiFlow is an authorized distributor.
DOHC-EHN overview
DOHCEHN (DOHC-EHN, DOHC EHN) is a Sun Hydraulics Sun Hydraulics Normally open, balanced poppet, logic element - pilot-to-close, rated 60 gpm (240 L/min.) and installed in cavity T-17A. 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.
| DOHCEHN/LH | Mild Steel, Zinc-NickelMild Steel, Zinc-Nickel |
|---|---|
| DOHCEHN | Standard Material/CoatingStandard Material/Coating |
Specifications
| Cavity | T-17A |
|---|---|
| Series | 3 |
| Capacity | 60 gpm (240 L/min.) |
| Maximum Operating Pressure | 5000 psi (350 bar) |
| Minimum Pilot Pressure Required to Shift Valve | 300 psi (20 bar) |
| Maximum Valve Leakage at 110 SUS (24 cSt) | 10 drops/min.@5000 psi (0,7 cc/min.@350 bar) |
| Pilot Volume Displacement | .05 in³ (0,82 cc) |
| Valve Hex Size | 1 1/4 in. (31,8 mm) |
| Valve Installation Torque | 150 - 160 lbf ft (203 - 217 Nm) |
| Seal kit - Cartridge | Viton: 990017006 |
How to read DOHCEHN
Sun part numbers are the model followed by one code per option. Hyphens, slashes and spaces are only dividers, so DOHCEHN, DOHC-EHN, DOHC EHN are the same part.
| Model | DOHC — Sun Hydraulics Normally open, balanced poppet, logic element - pilot-to-close |
|---|---|
| Control | E — External 4-SAE Drain Port |
| 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. |
Control options
- E — External 4-SAE Drain Port
- X — Standard Pilot, Atmospheric Vent
Minimum Pilot Pressure options
- H — 300 psi (20 bar)
Seal Material options
- N — Buna-N
- V — Viton
- E — EPDM
Material/coating options
- /LH — Mild Steel, Zinc-Nickel
- — Standard Material/Coating
Manifold & standard assemblies
Sun manifolds for cavity T-17A (377)
- BJO Sun Hydraulics ISO 05 – X&Y: On P, port 3 to T Sandwich manifoldDOHCEHN-BJO — request assembly
- BK2 Sun Hydraulics ISO 07: Reducer on A with reverse flow check Sandwich manifoldDOHCEHN-BK2 — request assembly
- BK4 Sun Hydraulics ISO 07: Sequence into A with reverse flow check Sandwich manifoldDOHCEHN-BK4 — request assembly
- BK5 Sun Hydraulics ISO 07: Sequence into B with reverse flow check Sandwich manifoldDOHCEHN-BK5 — request assembly
- BK6 Sun Hydraulics ISO 07: Sequence out of A with reverse flow check Sandwich manifoldDOHCEHN-BK6 — request assembly
- BK7 Sun Hydraulics ISO 07: Sequence out of B with reverse flow check Sandwich manifoldDOHCEHN-BK7 — request assembly
- BK8 Sun Hydraulics ISO 07: Cushion lock Sandwich manifoldDOHCEHN-BK8 — request assembly
- BK9 Sun Hydraulics ISO 07: Reducer on A and B with reverse flow check Sandwich manifoldDOHCEHN-BK9 — request assembly
- BKA Sun Hydraulics ISO 07: On A, port 3 to B Sandwich manifoldDOHCEHN-BKA — request assembly
- BKB Sun Hydraulics ISO 07: On B, port 3 to A Sandwich manifoldDOHCEHN-BKB — request assembly
- BKC Sun Hydraulics ISO 07: On A, port 3 external Sandwich manifoldDOHCEHN-BKC — request assembly
- BKJ Sun Hydraulics ISO 07: Reducer on B with reverse flow check Sandwich manifoldDOHCEHN-BKJ — request assembly
Technical features
- Unique balanced construction provides predictable switching with 5000 psi (350 bar) at both ports 1 and 2, with the external drain open and a minimum pilot pressure of 300 psi (20 bar).
- 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 open when the pilot pressure falls below 145 psi (10 bar).
- These 3-port balanced logic valves use the same cavity as unbalanced logic valves of the same frame size and can be considered functional replacements.
- Available in external atmospheric vent (X control) or static external drain (E control) configurations.
- Three-port vented logic elements with the X control are atmospherically referenced and considered problem solvers for existing circuits using non-vented valves. Over time, these valves will eventually leak externally and/or allow moisture into the spring chamber. Four-port valves are recommended for new applications. Alternately, the external vent port can be connected to drain if the static drain port option (control option E) is selected. Removing the vent plug will convert an X control to an E control.
- These valves are hydraulically balanced between port 1 and port 2.
- Port 1 and port 2 are fully sealed from port 3.
- 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
CAD files
Frequently asked questions
Is DOHCEHN the same as DOHC-EHN?
Yes. Sun Hydraulics writes this part number as DOHCEHN. It is the model DOHC followed by the configuration code; hyphens, slashes and spaces are only dividers, so DOHCEHN, DOHC-EHN, DOHC EHN all refer to the same product.
Do you supply DOHCEHN in the UAE, GCC and India?
Yes. MultiFlow supplies genuine Sun Hydraulics cartridges, including DOHCEHN, 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/DOHC
