| 摘要 |
Pilot operated coolant control valves in a manifold assembly for supplying a coolant to a rolling mill have apertured body members closing the manifold, the control valves are formed as removable cartridges positioned in registry with said apertured in said body members, each of said removable cartridges consists of a cartridge body having a cavity therein communicating with one end thereof, a cylindrical valve body in said cavity, a valve seat in said cylindrical valve body, a valve element movably disposed in said cylindrical valve body, spring means uring said valve element toward said valve seat, openings in said cylindrical valve body adjacent said valve seat for receiving coolant from said manifold by way of openings in said cartridge body so as to urge said valve element away from said valve seat. There is a pilot valve chamber in each cartridge body adjacent said cavity and a passageway establishes communication between said cavity and said pilot valve chamber and between said pilot valve chamber and the exterior of said cartridge body and said manifold, a secondary valve seat is formed in said passageway, a solenoid coil is positioned in said cartridge body and the solenoid plunger has a valve element movable toward and away from said secondary valve seat, a longitudinally extending groove om a sirface of said solenoid plunger forms a part of said passageway. A spring is positioned between said solenoid coil and the solenoid plunger uring said plunger toward said secondary valve seat so as to close said passageway when said solenoid coil is de-energized so that fluid pressure in the manifold moves the valve element away from said valve seat to establish communication for said coolant through said cavity, the cylindrical valve body, and said valve seat to a spray nozzle. |
