Spool hydraulic directional control valve 78

mechanically-operatedelectrically-operatedsolenoid-operated

Overview
The Moog Series 78 is part of Moog's family of mechanically feedback (MFB) servo valves. These are throttle valves for 3- and 4-way applications. The series features a powerful two-stage design covering a nominal flow range of 75 to 150 L/min (20 to 40 gpm) at 35 bar (500 psi) valve drop per spool. Options include standard and high-response versions, special null (spool) cuts, sealing materials and porting.

Features

• Two-stage flow control valve with mechanical feedback (MFB)
• Low-friction dual-nozzle pilot stage for high dynamics, high resolution and low hysteresis
• Rugged, long-life construction suitable for a variety of machines
• Intrinsic-safe (78K) or explosion-proof (78N) variants available for use in potentially hazardous environments
• Field-replaceable pilot-stage filter for simplified maintenance

Specifications
Hydraulic data
Rated flow*: 75 to 150 L/min
Standard configurations: 75, 115, 150 L/min
Max. operating pressure: 210 bar

Performance data
100% step response**: 15 to 40 ms
Frequency response***: 45 to 70 Hz

Electrical data
Rated signal****: 8 to 200 mA
Standard configurations: 8, 15, 40, 100 mA

Physical data
Size (mounting pattern): Moog standard
Weight: 2.9 kg

Further options: Intrinsically safe, explosion-proof, high null bias, reverse polarity, magnetic null adjustment, vented motor cap

* @ ∆p 70 bar (500 psi)/spool land
** Response at 3,000 psi System Pressure
*** at 90° Phase Lag
**** Single Coil

Characteristics / Technical specifications (Short overview)

• Rated flow: 75–150 L/min (20–40 gpm)
• Standard flow configurations: 75, 115, 150 L/min
• Max. operating pressure: 210 bar
• 100% step response: 15–40 ms
• Frequency response: 45–70 Hz
• Rated signal: 8–200 mA (standard: 8, 15, 40, 100 mA)
• Weight: 2.9 kg
• Available variants: 78K (intrinsic-safe), 78N (explosion-proof)