Metering the flow
The metering cage and sliding piston shape a controlled flow characteristic as the plug travels.
WOODWARDINDUSTRIAL TURBINE CONTROL
Woodward 9904-574 Three-Way Fuel Oil Bypass Control Valve
three-way bypass valve · modulating metering plug · liquid fuel path
01
Product Information
Woodward 9904-574 is a three-way fuel-oil bypass control valve with a modulating metering plug. It regulates whether the fuel path is directed toward the turbine port or the bypass port as the plug moves through its controlled range.
For Woodward 9904-574, fuel enters through the bottom inlet while the bypass and turbine ports leave through the side of the valve. The metering cage and sliding piston shape the flow path, and the triple-coil electrohydraulic servo valve positions the piston in proportion to the applied electrical command.
Fuel enters Woodward 9904-574 through the bottom inlet and leaves through the turbine or bypass side port as the metering piston moves. The electrohydraulic servo positions that piston, while the dual internal seals keep fuel oil and hydraulic oil separated.
02
Technical Data
| Technical Item | 9904-574 |
|---|---|
| Brand | Woodward |
| Product type | Three-way bypass control valve |
| Valve action | Modulating metering plug |
| Trim configuration | Linear—diverging |
| Trip position | Plug left; inlet to bypass |
| Run position | Plug right; inlet to turbine |
| Fluid ports | 2 in or 3 in SAE J518 Code 61 |
| Fluid | Light distillate fuel |
| Maximum supply pressure | 1200 psig (8274 kPa) |
| Proof test pressure | 1800 psig (12411 kPa), minimum 2 minutes |
| Minimum burst pressure | 6000 psig (41370 kPa), minimum 1 minute |
| Fuel filtration | 25 µm at Beta 200 |
| Fuel temperature | −18 to +93 °C |
| Ambient temperature | −29 to +82 °C |
| Failure mode | To bypass on loss of electrical signal |
03
Metering and Bypass Routing
Woodward 9904-574 performs modulating fuel routing between the turbine and bypass ports.
Directing the turbine path
In the run position, the plug routes inlet fuel toward the turbine port through the metered passage.
Diverting to bypass
In the trip position or on loss of electrical signal, the valve routes the inlet toward bypass.
04
Sealing and Pressure Boundary
The fluid-separation and pressure features of Woodward 9904-574 define the boundary between fuel, hydraulic oil and the environment.
Dual internal seals
The dual-seal arrangement separates fuel oil from hydraulic oil and provides a vent path between the seals.
Static external sealing
External seals are static elastomeric seals, so the outside sealing boundary is distinct from the internal fluid pair.
Pressure verification
Proof and burst pressure checks apply to the valve pressure boundary and must not be confused with normal operating pressure.
05
Frequently Asked Questions
Which port arrangement must be matched on Woodward 9904-574?
Match the bottom fuel inlet and the side turbine/bypass ports to the valve outline before connecting piping. A flange that matches the nominal size does not prove that the flow direction is correct.
How does Woodward 9904-574 react when the electrical signal is lost?
The listed failure mode routes the valve to bypass on loss of electrical signal. Confirm the receiving fuel system is designed for that state before applying the control signal.
What filtration is required before fuel enters Woodward 9904-574?
Provide fuel filtration at 25 µm with Beta 200 performance. Check the filter location and service boundary rather than assuming a general plant filter meets the valve requirement.
How should the seals of Woodward 9904-574 be checked?
Verify the dual internal seals and the vent path between fuel and hydraulic oil, then inspect the static external seals. Do not treat an external seal check as proof that the internal fluids are separated.
Can the proof pressure of Woodward 9904-574 be used as its operating pressure?
No. The 1800 psig proof test and 6000 psig burst values are pressure-boundary test levels; normal supply pressure is limited to 1200 psig.
What does the modulating plug do in Woodward 9904-574?
The plug changes the metering path between the inlet and the turbine or bypass outlet. Confirm the run and trip direction before checking a position or flow complaint.
06
Customer Support
MOORE AUTOMATION
https://www.mvme.cn/
Moore Automation assigns an enquiry contact to the requested Woodward part so questions about the model, quantity and order requirements stay in one communication path.
Exact model recordOriginal manufacturerQuantity confirmationOrder trace
www.mvme.cn
07
Product Recommendations
ProSoftMVI56E-MNET
Siemens6ES7288-1ST40-0AA1
TRICONEX3010X
Vibro-meterCA201
Woodward5430-933
YokogawaAAI543-H60/K4A00
ABB3HAC055697-003
Allen-Bradley1734-OB8
B&RX20CP3686X
Bently Nevada330500-02-00
Bosch RexrothHMS01.1N-W0054-A-07-NNNN
EmersonEPRO MMS6220
FoxboroRH914TN
GEIC670ALG240
HIMAF3237
HoneywellCC-PAOH01
ICS TriplexT8290C
MotorolaMVME147-001
ProSoftMVI69E-MBS
Siemens6ES7288-1ST60-0AA1
TRICONEX4355X
Vibro-meterCA202
WoodwardRB5
YokogawaAAV141-S50/K4A00
ABB3HAC055697-004
Allen-Bradley1734-AENTR
B&RX20CP3586
Bently Nevada330130-030-00-00
Bosch RexrothHDS02.2-W040N-HS32-01-FW
EmersonEPRO MMS6250
FoxboroRH916BT
GEIC670ALG310
HIMAF3349
HoneywellCC-PAIX02
MotorolaMVME147-010
ProSoftRLX2-IHNF-A
Siemens6ES7288-1CR20-0AA1
TRICONEX3506X
Vibro-meterTQ912
WoodwardUG-10
YokogawaAAI543-H50/K4A00
ABB3HAC055700-003
Allen-Bradley1734-EP24DC
B&RX20CP3585
Bently Nevada330130-035-00-05
Bosch RexrothDKC02.3-040-7-FW
EmersonEPRO MMS6310
FoxboroRH916JT
GEIC670ALG320
HIMAX-CPU 01
HoneywellFC-SDO-0824
MotorolaMVME147-010A
ProSoftPLX31-EIP-MBTCP
Siemens6ES7288-1CR30-0AA1
TRICONEX3723X
Vibro-meterIPC707
Woodward8440-1809
YokogawaAAI143-S50/A4S00
ABB3HAC055700-004
Allen-Bradley1734-IB8S
Sales Enquiries
Send the complete model and requested quantity with your enquiry.
ManagerLeonia
Emailsales@mvme.cn
WhatsApp+86 180 3017 5807
No related record found