Spool hydraulic directional control valve 771

poppetelectrically-operatedpilot-operated

Product description
The flow-control servo valves of series 771, 772 and 773 are throttle servo valves for 3- and preferably 4-way applications. They use a high-performance two-stage design covering a rated flow range of 1.9 to 57 l/min (1 to 15 gpm) at 210 bar (3000 psi) valve pressure drop per control spool. These valves are intended for electrohydraulic position, velocity, pressure or force control systems that require high dynamic response. The 77X valves are particularly suitable where superior dynamics are essential.

Features

• Two-stage servo valve with mechanical feedback (MFB)
• Low-friction dual-nozzle pilot stage technology for high dynamics, high resolution and low hysteresis
• High coil drive forces and robust construction for extended service life
• Compact body size
• Intrinsic-safe version available for applications requiring hazardous-area certification

Specifications (table)
Specifications
Hydraulic data
Rated flow*: 1.9 to 57 l/min
Standard configurations: 4, 10, 19, 38, 57 l/min
Max. operating pressure: 210 or 350 bar
Performance data
100% step response**: 4 to 17 ms
Frequency response***: 115 to 215 Hz
Electrical data
Rated signal****: 8 to 200 mA
Standard configurations: 8, 15, 20, 40, 200 mA
Physical data
Mounting size: (G)771: Size 02 (ISO 10372-02-02-0-92); (G)772: Size 03 (ISO 10372-03-03-0-92); (G)773: Moog Standard
Weight: 0.86 kg
Other options: Intrinsic-safe, magnetic null adjustment, vented motor cap, reverse polarity

* @ ∆p 70 bar (1,000 psi)
** Response at 3,000 psi system pressure
*** at 90° phase lag
**** Single coil

Resources / documents (extract)
Multiple product documents and installation drawings available (catalogs, manuals, data sheets, installation drawings).