Emerson Daniel 1770, User Manual

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Approximate shipping weights and cube Table 2-5:
Approximate shipping weight Approximate shipping cube
Valve
size Model 770 Model 770
Class 150 Class 300 Class 600 Class 150-300 Class 600
lbs. kilos lbs. kilos lbs. kilos cubic
feet cubic
meters cubic
feet cubic
meters
2 55 21 60 22 100 37 1.66 0.047 1.79 0.051
3 95 35 105 39 150 56 2.36 0.067 2.50 0.071
4 115 43 140 52 205 77 2.51 0.071 3.13 0.089
6 210 78 250 93 400 149 4.84 0.137 6.07 0.172
8 400 149 465 174 725 271 8.94 0.253 9.98 0.283
10 640 239 700 261 1170 437 12.08 0.342 15.13 0.428
12 1040 388 1215 454 1820 679 20.25 0.573 21.94 0.621
16 CF CF CF CF CF CF 39.53 1.119 42.17 1.194
CF=consult factory
2.3 Pilot spring selection
2.3.1 Pilot spring selection table
The following Pilot spring selections table is a complete listing of regulating pilot valve
figure numbers, part numbers, pilot springs, spring part numbers, and piston diameters.
The application of pilot springs is significant and often misunderstood. The pressure range
of a specific pilot spring relates directly to the area of the pilot piston exposed to fluid
sensing (FORCE = PRESSURE X AREA). In other words, the control range of a spring will vary
with the outside diameter of the pilot's piston. In effect, a light spring combined with
various piston diameters increases pilot sensitivity, whereas a heavier spring used without
changing the piston size decreases sensitivity and accuracy of set point. The use of various
sizes assures the most compact and flexible pilot available and is a key to the accurate set
point control found in Daniel valves.
The table outlines the standard and optional springs, spring ranges and piston diameters
for all integral and external piston operated pilots for Series 700 control valves.
Operating conditions and specifications
40 Differential Control Valve