Spool hydraulic directional control valve D636

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Overview
Moog servovalves D636 and D637 are direct-operated servovalves with integrated amplifier/control electronics and an optional fieldbus interface. The valves use a permanent-magnet linear motor that directly drives the spool, eliminating the need for pilot/control oil. They are available in ISO 4401 sizes NG6 (D636) and NG10 (D637) and are designed for demanding industrial control tasks requiring pressure-independent dynamics, high force capability and low electrical current near the hydraulic null.

Features

• Direct drive with permanent-magnet linear motor — no pilot oil required
• Pressure-independent dynamic response
• High force linear motor — unrestricted flow capability
• Low current consumption at or near hydraulic null
• Spring-centered spool on power loss — actuator holds position
• Integrated amplifier and control electronics for flexible functionality

Specifications
Functions: flow, pressure, flow & pressure (p/Q), pressure-compensated flow, axis control (position, velocity, force)
Mounting pattern: ISO 4401 size 03 (NG6) | ISO 4401 size 05 (NG10)

Hydraulic data
Rated flow at ΔpN = 35 bar per land: D636 up to 40 l/min | D637 up to 100 l/min
Maximum flow: D636 75 l/min | D637 180 l/min
Maximum operating pressure: ports P, A, B — 350 bar
Port T without Y — 50 bar
Port T with Y — D636: 350 bar | D637: 210 bar
Step response (0–100%): D636 8 ms | D637 14 ms

Electrical data
Supply voltage: 24 V DC (18 to 32 V DC)
Command signal options: ±10 V, ±10 mA, 4–20 mA
Electrical connector options: 6+PE, 11+PE

Options

• Fieldbus interface
• Additional analog inputs for sensors

Technical specifications

• Model/Series: D636 (NG6) and D637 (NG10)
• Functions: flow, pressure, p/Q, pressure-compensated flow, axis control (position, velocity, force)
• Rated flow at ΔpN=35 bar per land: D636 up to 40 l/min, D637 up to 100 l/min
• Maximum flow: D636 75 l/min, D637 180 l/min
• Max. operating pressure: P/A/B 350 bar; Port T without Y 50 bar; Port T with Y: D636 350 bar, D637 210 bar
• Step response (0–100%): D636 8 ms, D637 14 ms
• Supply voltage: 24 V DC (18–32 V DC)
• Command signal options: ±10 V, ±10 mA, 4–20 mA
• Electrical interfaces: 6+PE and 11+PE
• Options: Fieldbus interface, additional analog inputs for sensors