Patent ID: 9027588
Filing Date: 2015-05-12
Classification: F16K,G05D,H01L,Y10T

Abstract:
1. A pressure control device comprising: a valve configured to regulate a gate opening between an upstream side gas pipe and a downstream side gas pipe, thereby regulating a gas pressure in the upstream side gas pipe or the downstream side gas pipe; a shaft portion connected to the valve; a solenoid portion configured to move the shaft portion in an axial direction through solenoid driving, thereby regulating the gate opening through the shaft portion; a unit removably attached to the shaft portion, the unit being configured to move the shaft portion in the axial direction by a screw mechanism and a motor in order to regulate the gate opening through the shaft portion when the unit is attached to the shaft portion; and a control unit configured to control the solenoid portion and the unit in such a manner that the gas pressure in the upstream side gas pipe or the downstream side gas pipe is a desirable gas pressure, wherein the unit controls the gas pressure when the unit is attached to the shaft portion, and the solenoid portion controls the gas pressure when the unit is removed from the shaft portion.