FVDA8-AN – Sun Hydraulics Ventable, fixed-orifice, bypass/restrictive, priority flow control valve with integral T-8A control cavity
Part number: FVDA8AN · FVDA8-AN · FVDA8 AN
Ventable, fixed-orifice, bypass/restrictive, priority flow control valve with integral T-8A control cavity. Cavity T-22A, capacity 12 gpm (45 L/min.). Genuine Sun Hydraulics cartridge — MultiFlow is an authorized distributor.
FVDA8-AN overview
FVDA8AN (FVDA8-AN, FVDA8 AN) is a Sun Hydraulics Sun Hydraulics Ventable, fixed-orifice, bypass/restrictive, priority flow control valve with integral T-8A control cavity, rated 12 gpm (45 L/min.) and installed in cavity T-22A. 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.
| FVDA8AN | Buna-N sealsBuna-N |
|---|---|
| FVDA8AV | Viton sealsViton |
| FVDA8AE | EPDM sealsEPDM |
Specifications
| Cavity | T-22A |
|---|---|
| Series | 2 |
| Capacity | 12 gpm (45 L/min.) |
| Maximum Operating Pressure | 5000 psi (350 bar) |
| Nominal Vent Flow | 46 in³/min. (0,75 L/min.) |
| Maximum Input Flow | 30 gpm (120 L/min.) |
| 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 1/8 in. (28,6 mm) |
| Valve Installation Torque | 45 - 50 lbf ft (61 - 68 Nm) |
| Model Weight | .40 lb (0,20 kg) |
| Seal kit - Cartridge | Viton: 990022006 |
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 FVDA8AN
Sun part numbers are the model followed by one code per option. Hyphens, slashes and spaces are only dividers, so FVDA8AN, FVDA8-AN, FVDA8 AN are the same part.
| Model | FVDA8 — Sun Hydraulics Ventable, fixed-orifice, bypass/restrictive, priority flow control valve with integral T-8A control cavity |
|---|---|
| Setting Range | A — Replaceable Orifice .1 - 12 gpm (0,4 - 45 L/min.) |
| 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. |
Setting Range options
- A — Replaceable Orifice .1 - 12 gpm (0,4 - 45 L/min.)
- B — Permanent Orifice .1 - 12 gpm (0,4 - 45 L/min.)
Seal Material options
- N — Buna-N
- V — Viton
- E — EPDM
Manifold & standard assemblies
Sun manifolds for cavity T-22A (70)
- N4A Sun Hydraulics Ninety degree with reverse flow check – reducing Line mount manifoldFVDA8AN-N4A — request assembly
- N4B Sun Hydraulics Ninety degree with reverse flow check – reducing Line mount manifoldFVDA8AN-N4B — request assembly
- N4C Sun Hydraulics Ninety degree with reverse flow check – reducing Line mount manifoldFVDA8AN-N4C — request assembly
- N4D Sun Hydraulics Ninety degree with reverse flow check – reducing Line mount manifoldFVDA8AN-N4D — request assembly
- N4I Sun Hydraulics Ninety degree with reverse flow check – reducing Line mount manifoldFVDA8AN-N4I — request assembly
- N4J Sun Hydraulics Ninety degree with reverse flow check – reducing Line mount manifoldFVDA8AN-N4J — request assembly
- N4K Sun Hydraulics Ninety degree with reverse flow check – reducing Line mount manifoldFVDA8AN-N4K — request assembly
- N4L Sun Hydraulics Ninety degree with reverse flow check – reducing Line mount manifoldFVDA8AN-N4L — request assembly
- N4T Sun Hydraulics Ninety degree with reverse flow check – reducing Line mount manifoldFVDA8AN-N4T — request assembly
- N4U Sun Hydraulics Ninety degree with reverse flow check – reducing Line mount manifoldFVDA8AN-N4U — request assembly
- N4V Sun Hydraulics Ninety degree with reverse flow check – reducing Line mount manifoldFVDA8AN-N4V — request assembly
- N4W Sun Hydraulics Ninety degree with reverse flow check – reducing Line mount manifoldFVDA8AN-N4W — request assembly
Technical features
- Customer must specify a flow rating. Factory set flow ratings are within +/- 10% of the requested setting.
- Using a pressure control in the T-8A pilot control cavity will limit the pressure at the priority port (port 3). If pressure on the bypass port (port 2) exceeds the setting of the pressure control, priority flow will be shut off and all the flow will go out the bypass port.
- Maximum pressure at port 3 should be limited to 3000 psi (210 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.
- Cartridges with EPDM seals are for use in systems with phosphate ester fluids. Exposure to petroleum based fluids, greases and lubricants will damage the seals.
- Both priority and bypass flow are usable up to the system operating pressure.
- Priority remains relatively constant regardless of variation in input flow.
- Bypass flow is not available until priority flow requirements are satisfied, except when the valve is vented. When port 4 (vent) is open, all flow diverts to port 2 if pressure at port 1 (inlet) is 150 psi (10,5 bar) or higher.
- Pressure at the bypass port (port 2) may exceed pressure at the priority port (port 3).
- The sharp-edged orifice design minimizes flow variations due to viscosity changes.
- The -8 control option allows the pilot control valve to be incorporated directly into the end of the 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.
- 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 FVDA8AN the same as FVDA8-AN?
Yes. Sun Hydraulics writes this part number as FVDA8AN. It is the model FVDA8 followed by the configuration code; hyphens, slashes and spaces are only dividers, so FVDA8AN, FVDA8-AN, FVDA8 AN all refer to the same product.
Do you supply FVDA8AN in the UAE, GCC and India?
Yes. MultiFlow supplies genuine Sun Hydraulics cartridges, including FVDA8AN, 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.
What happens if I block the bypass port on a priority flow control?
The valve acts as a 2 port restrictive flow control.
What is the compensating pressure of Sun's flow controls?
The spring force in our flow controls equates to about 100 psi (7 bar). This is high enough to give the valves acceptable capacity and not too high for proper circuit operation. 100 psi (7 bar) is the spring force; at the upper end of the flow control's range, the drop through the valve will be as high as 250 psi (17 bar) before it starts modulating.
How big is a drop of hydraulic oil?
There are exactly 250 Sun drops in a cubic inch or 15 in a cc.
What is the pressure drop through a flow control?
In a meter-in flow control circuit if the pump is set at 3000 psi and the load is 2000 psi the drop through the flow control is 1000 psi. In a meter-out circuit with the load at 2000 psi the drop through the flow control is 2000 psi.
How accurate are Sun's flow controls?
We claim +/- 10%. We set to +/- 5% in production testing to allow for differences in customers' conditions. If you want accuracy, stay in the bottom 2/3rds of the range. Our 12 gpm (45 L/min.) flow controls are quite flat at 9 gpm (34 L/min.) and dead flat below 6 gpm (23 L/min.), until you get to the bottom of the range. Below about .25 gpm (1 L/min.), spool leakage and orifice conditions start to limit accuracy.
I have a heat problem, will Sun's priority flow control help?
I am afraid not. Unless you are overflowing your current valve and correctly size ours, you are not likely to notice any improvement. Priority flow controls are not efficient devices. They are an easy way to get more than 1 source of oil from 1 pump but they can generate a lot of heat. Try to size your actuators so the pressures are similar on both the priority and the bypass circuits. If you can't do that, try to have the lower flow leg be the lower pressure. The pump pressure is determined by whichever leg is higher and if there is flow that is taking a pressure drop that is not doing work it is creating heat.
What happens if I block the control flow (priority) port?
All flow is blocked, hence the term priority. The priority flow has to be satisfied.
What parts of the Sun cartridge valve are field serviceable?
Manufacturer reference: https://www.sunhydraulics.com/model/FVDA8
