Order 70-3 as a set with 70-2 and save! This standard applies to pilot operated and direct acting pressure reducing, pressure relieving (back pressure), differential pressure and temperature regulators.Selection of a leakage class is not restricted as to regulator design, but acceptable values for various commercially available designs are suggested for each class under Section 4.The standard cannot be used as a basis for predicting leakage at conditions other than those specified.This standard is similar to FCI 70-2.This standard does not apply to pressure regulators as defined in the following standards: - ANSI Z21.18/CSA 6.3 - ANSI Z21.80/CSA 6.22 - ANSI Z21.78/CSA 6.20