Handle 1 turns about fixed axis A. Piston rod 3 reciprocates in fixed guide a-a. Throttle valve 2 turns about fixed axis K. Link 4 is connected by turning pairs H and G to links 2 and 5 which turn about fixed axes K and A. Link 6 is connected by turning pairs E, D and C to links 5, 7 and 8. Link 8 is connected by turning pair B to handle 1. When handle 1 is turned with piston rod 3 stationary, throttle valve 2 is set in a definite position providing for normal pressure. If the pressure increases, piston rod 3 descends, turning valve 2 without moving handle 1. Handle 1 can be locked in a definite position by a device which is not shown.
$815$LW,G$