| 摘要 |
<p>In a pressure controller, a drive piston (17) and a pressure control valve (24) are freely movably supported in a housing (11), the drive piston (17) is supported by being energized and also the pressure control valve (24) is supported by being energized to make a pressure chamber (R 3 ) and a decompression chamber (R 2 ) communicatively connectible, the drive piston (17) and the pressure control valve (24) are moved by means of an electromagnetic force of a solenoid via a ring piston (19) to make a hyperbaric chamber R and the pressure chamber R 3 communicatively connectible and also an external piston (30) is freely movably provided facing the drive piston (17) and by making a control pressure acting on the external piston (30) from a rear pressure chamber R 32 on a drive piston (17) side equal to or greater than an external pressure acting from outside from an input unit (36), pressure control can properly be performed by readily moving a drive valve by means of pressure from outside when a power supply is defective.</p> |
