Series D633 and D634 - Direct Driven Valves (DDV) for flow control with analog interface

The Moog D633 and D634 series valves are direct operated servo valves with integrated electronics and analog interface. The servo valves of the D633 and Moog D634 series offer a direct drive with a permanent magnet linear motor, which moves the valve spool directly and eliminates the need for pilot oil. They are available in nominal sizes 03 (D633) and 05 (D633) in accordance with ISO 4401.

The servo valves were developed with the most demanding customer requirements in mind and are characterized by high functional flexibility, pressure-independent dynamics, high actuating force and low power consumption.

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Directly driven by linear force motor: No pilot flow required
Linear force motor with high force range (improves operating limits): No flow limitations
Directly driven design: Pressure-independent dynamic performance
Low current consumption at and near hydraulic null
Spool is in spring-centered position at loss of power supply: Actuator stops

Specifications
	D633	D634
Control Functions	Flow
Mounting Pattern	ISO 4401 Size 03 (NG6)	ISO 4401 Size 05 (NG10)
Hydraulic Data
Rated Flow at ∆p 35 bar (500 psi) per land	up to 40 l/min (10.6 gpm)	up to 100 l/min (26.4 gpm)
Maximum Flow	75 l/min (19.8 gpm)	180 l/min (47 gpm)
Maximum Operating Pressure	Port P, A, B - 350 bar (5,000 psi) Port T without Y - 50 bar (725 psi) Port T with Y - 350 bar (3,000 psi)
Step Response Time for 0 to 100% Step	12 ms	20 ms
Electrical Data
Supply Voltage	24 V_DC (18 to 32 V_DC)
Rated Signal Options	+/-10 V, +/-10 mA and 4 to 20 mA
Electrical Connectors	6+PE