Head-Pressure Control Valves Operation

ORI head pressure control valve inlet pressure regulating valve. He responds to changes in the pressure of condensation. Valve designation stands opens the rise of the inlet pressure. As shown in Fig. 11-32, the output of the pressure put on the bottom of the bellows, and on top of the seat disc. Since the effective size of the bellows equal to the area of the port outlet pressure cancels. Input pressure acting on the bottom of the seat disk opposes adjusting spring. These two forces operating forces of the ORI.

When the outside temperature changes. ORI opens or closes in response to changing the pressure of condensation. The increase in pressure above the installation of the valve, as a rule, to open the valve. If the temperature falls, the capacitance of the capacitor increases and the condensing pressure falls. This leads ORI start closing or assume adjustment.