Description
Product Overview
The MOOG G771K226A is an electrohydraulic servo valve used to convert an electrical command into controlled hydraulic flow. In a closed-loop motion-control system, the valve regulates fluid delivery to an actuator, allowing a machine controller to influence movement, speed, or position through the hydraulic circuit. Typical application environments include industrial machinery and hydraulic systems where controlled response is required. The exact function within a machine depends on the hydraulic schematic, actuator arrangement, feedback system, and controller configuration.
The G771K226A is described by supplier listings as a direct-operated flow-control valve for analog signals. Published data associates the unit with a maximum pressure of 3,000 psi (approximately 210 bar), rated flow of 10 US gpm, and a reported step response of 4 ms. These figures are useful for preliminary identification, but rated flow depends on the specified pressure drop and test conditions; the response figure also depends on the test method and operating setup. Engineers should use the correct MOOG performance curve and technical datasheet when sizing or validating a replacement.
For maintenance and procurement, the full model designation matters because servo valves that appear similar can differ in spool configuration, electrical characteristics, flow rating, seals, and mounting details. The G771K226A has been listed alongside newer G771-series alternatives, including G771K288A. That cross-reference should be treated as a candidate for evaluation rather than automatic interchangeability. Before ordering, compare the nameplate, connector arrangement, command signal, hydraulic port pattern, pressure rating, fluid compatibility, and machine-specific null or bias requirements. After installation, follow the approved hydraulic flushing, air removal, and functional validation procedure. Confirm actual condition with supplier and request test documentation where available.
Product Introduction
The MOOG G771K226A is an analog-command electrohydraulic servo valve for controlling hydraulic flow in industrial motion systems. Its performance depends on correct electrical drive, hydraulic supply conditions, fluid cleanliness, and integration with the actuator and feedback loop.
For replacement projects, verify the exact valve configuration and mounting interface before approving a substitute. Confirm the supplier’s condition statement and request recent functional test results, especially when the valve will be used in a precision or high-duty hydraulic application.
Key Technical Specifications
| Specification | Details |
|---|---|
| Manufacturer | MOOG |
| Model | G771K226A |
| Series | G771 |
| Cross-reference | 312A6077P008 |
| Supplier-listed designation | H10FOFA4V14 |
| Product type | Electrohydraulic servo valve |
| Operating principle | Direct-operated flow control, according to supplier listing |
| Command type | Analog electrical signal |
| Maximum pressure | 3,000 psi / approximately 210 bar |
| Rated flow | 10 US gpm; confirm rating conditions |
| Step response | 4 ms, reported by supplier |
| Seal material | FKM / Viton, as listed by supplier |
| Electrical input details | Verify against the exact valve datasheet |
| Hydraulic port dimensions | Verify against the manufacturer’s dimensional drawing |
| Fluid compatibility | Confirm based on seal material and fluid specification |
| Mounting interface | Confirm against the exact configuration |
| Operating temperature | Not independently verified |
| Condition | Confirm actual condition with supplier |
G771K226A
Related Products
| Model | Description |
|---|---|
| MOOG G771K288A | Listed as a newer replacement candidate for G771K226A; confirm full electrical and hydraulic compatibility. |
| MOOG G771K226 | Earlier related designation; supplier records identify as its replacement. |
| MOOG G771K227A | Related G771-series servo valve, but not confirmed interchangeable with . |
| MOOG G771K235A | Related G771-series model; verify flow, spool, and electrical configuration. |
| MOOG G772 series | Related servo-valve family with different configurations and flow capabilities; not a direct substitute by series alone. |
Frequently Asked Questions
Q1: What is the MOOG used for?
It regulates hydraulic flow in response to an analog electrical command and is used in industrial hydraulic motion-control systems.
Q2: What is its maximum pressure rating?
Supplier documentation lists 3,000 psi, approximately 210 bar. Confirm the rating on the specific unit and its applicable datasheet before installation.
Q3: Is G771K288A a direct replacement?
It is listed as a replacement candidate for , but do not assume a drop-in substitution without checking the hydraulic and electrical specifications, mounting interface, and machine requirements.
Q4: What electrical command signal does it require?
The valve is described as analog-commanded, but the exact input range and electrical characteristics were not independently verified. Match the valve to the installed servo amplifier or controller documentation.
Q5: What should be checked before installation?
Verify the port pattern, mounting interface, hydraulic pressure and flow requirements, fluid and seal compatibility, electrical connections, and the approved hydraulic flushing procedure.
Q6: Can a used servo valve be installed without testing?
That is not advisable for a precision hydraulic system. Request a functional test report covering leakage, null behavior, flow response, and pressure conditions appropriate to the application.
Q7: What should procurement confirm?
Confirm the complete part number , the cross-reference if applicable, actual condition, and available test documentation. If considering G771K288A, obtain written confirmation of compatibility for the specific machine and hydraulic circuit.
