| 摘要 |
<p>SANDMILL CONTROL SYSTEM High pressure sandmill operation is obtained by balancing the pressure within the vessel on one side of a rotor shaft seal with a higher pressure on the other side of the seal. Pressure switches are employed to sense the pressure within the vessel, the seal housing, and the cooling water jacket surrounding the vessel. The switches are connected in electrical control circuits to deenergize the product pump whenever the sensed pressures are beyond predetermined acceptable ranges. The control circuits also energize lights which indicate which pressure was out of its range and energize a light indicating that the pump motor is deenergized. The control circuit further includes means responsive to the temperature of the product being pumped to the vessel so that an audible warning signal is generated if the temperature exceeds a predetermined level.</p> |
