Features Performance Graph PIV Chains Spares & Services
Other Products Ratings / Dimensions Auxilliary Devices Product Video

Full Load Efficiency
The graph shows the efficiency of a basic PIV unit, which may be taken as typical for all sizes. It will be seen that under full load conditions, this is 86% at top speed, and 95% at mean speed.

With compound attachments, the efficiency is reduced by 1.5% for each pair of spur gears and between 20% and 30% for worm gears in the W portion.

The power which can be transmitted at output speeds between maximum and minimum is shown in the graph by considering the speed concerned as a percentage of maximum speed. The power at this speed is then read off the graph as a percentage of the power at maximum speed.

Selection Data
Data required for selection of PIV unit:
a) Speed Ratio
b) Power or Torque at Max. or Min. speed, or Motor HP available.
c) Operation conditions, e.g. running time per day, frequency of starts, uniformity of loads.

Service Factor
The maximum input horsepower of basic PiV units given in the rating tables are for units operating under uniform load for 12 hours per day. Where operating conditions differ, multiply the required power by the factors shown:

Rating time per day Uniform load Moderate shockload Heavy shockload
06 hrs.
12 hrs.
24 hr.