Spool hydraulic directional control valve D79x

hydraulically-operatedpilot-operatedfieldbus

Product description
The D79x series servovalves from Moog are hydraulically piloted, three-stage servovalves with integrated electronics and an analog interface. The spool uses a piston-in-sleeve design enabling higher flow capacities while maintaining very high dynamic performance. The series is available in two sizes (D791, D792) and in multiple functional variants (flow, pressure, p/Q, axis control for position, velocity, force). Designed for demanding industrial applications requiring fast response and high flow.

Features

• Three-stage valve design for high dynamics
• Electrical position feedback (LVDT) — wear-free
• Integrated electronics with reverse-polarity protection
• Optional external pilot supply and return via additional X and Y ports in the valve body
• Low threshold and low hysteresis; excellent zero stability

Specifications

• Series: D79x (D791, D792)
• Valve design: 3-stage; piston-in-sleeve, hydraulically piloted
• Functions: flow (Q), pressure (p), p/Q, axis control (position, velocity, force)
• Rated flow at ΔpN = 35 bar per metering edge: D791 = 100–250 l/min; D792 = 400–1000 l/min
• Max. flow: D791 = 250 l/min; D792 = 1100 l/min
• Max. operating pressure: Ports P, A, B = 350 bar; Port T with internal Y = 70 bar; Port T with external Y = 350 bar
• Step response 0–100%: D791 = 3–10 ms; D792 = 4–12 ms
• Electrical supply: 24 V DC (range 18–32 V DC)
• Control signal options: ±10 V, ±10 mA, 4–20 mA
• Electrical interfaces: 6+PE and 11+PE
• Options: fieldbus interface, additional analog inputs for sensors
• Key features: LVDT position feedback (wear-free), integrated electronics with reverse-polarity protection, low hysteresis and excellent zero stability

Resources / available documents
Catalogs and datasheets available (see documents).