The paper points out that the gas pressure reducers with high intake pressure (20 MPa; the case of reducers for conveying vessels with compressed gas), the friction forces that arise as a result of mobile chain moving the reducer cannot be neglected. As a result of theoretic study and experiments done it is demonstrated that the friction influences with 7.5% the value of adjustable parameter (pressure p2 at the output of reducer), being requested measures to decrease the values of these forces.
