Moog 500 Series Specifications download pdf (Page 8)

Terminology

ELECTRICAL

Input Current – The electrical current to the valve which

commands control flow, expressed in milliamperes (mA).

Rated Current – The specified input of either polarity to

produce rated flow, expressed in milliamperes (mA). Rated current

is specified for a particular coil configuration (differential, series,

individual or parallel coils) and does not include null bias current.

Coil Impedance – The complex ratio of coil voltage to current.

Coil impedance will vary with signal frequency, amplitude, and

other operating conditions, but can be approximated by the DC

coil resistance R, expressed in ohms(½) and the apparent coil

inductance L, expressed in henrys (H), measured at a specific

signal frequency.

Dither – An AC signal sometimes superimposed on the valve

input to improve system resolution. Dither is expressed by the

dither frequency hertz (Hz) and the peak-to-peak dither current,

expressed in milliamperes (mA).

GENERAL TERMINOLOGY

Per SAE ARP 490

See Moog Technical Bulletin No. 117 for a complete discussion of Closed Loop and Valve terminology and test techniques.

Units:

Recommended English and Metric units for expressing valve performance include the following:

/sec (cis) liters/min (lpm) 0.98 lpm/cis

Fluid Flow 3.85 cis/gpm

gal/min (gpm) 3.78 lpm/gpm

Fluid Pressure lb/in

(psi) bar 0.069 bar/psi

millimeters (mm) 25.4 mm/in

Dimensions inches (in)

micrometers (µm) 25400 µm/in

Weight pounds (lb) kilograms (kg) 0.454 kg/lb

Torque in-lb Newton meters (N-m) 0.113 N-m/in-lb

Temperature degrees Fahrenheit (˚F) degrees Celsius (˚C) ˚C =

(˚F – 32)

CONVERSION

CATEGORY ENGLISH METRIC

FACTORS

Terminology

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Moog 500 Series Specifications Page 8