Hand 2, turning about fixed axis A, is linked to Bourdon tube 1 which is connected to the item whose pressure is to be regulated. Link 13 is connected by turning pairs B and C to hand 2 and to shutter 3 which turns about axis D, attached to bellows 12, and approaches nozzle 4. Compressed air is delivered through tube 5 and flow-control valve 6 to nozzle 4. The nozzle is also connected to bellows 7 to which the ball of valve 8 is linked. Air is delivered through flow-control valve 9 to valve 8 whose chamber is connected to the atmosphere and to the membrane chamber of servomotor 10. When the pressure drops in the item being regulated, hand 2 turns clockwise, shutter 3 approaches nozzle 4, the pressure in bellows 7 increases, and the ball of valve 8 is lowered, connecting the membrane chamber of servomotor 10 to the atmosphere. This reduces the pressure on the membrane and valve 11 is opened to some extent, increasing the supply of the heat-carrying agent to the system. Bellows 12 is connected to the membrane chamber of servomotor 10 through flow-control valve 14. For this reason, the pressure in bellows 12 drops with a certain lag, during which the pressure on the membrane of servomotor 10 continues to remain less than it would be with ordinary operation of a feedback bellows, i.e. one without flow-control valve 14. With this arrangement, regulating valve 11 first greatly increases the supply of heat-carrying agent, thereby tending to decrease a subsequent deviation of the parameter being regulated and reducing the length of the transient slate. Flow-control valve 14 can influence the rate of the regulating process. When the pressure in the system increases, the elements of the regulator operate in the reverse direction.
$4089$EHP,Rg$