| 摘要 |
A switching and purging mechanism is disclosed for controlling flow of gas within a twin tower gas drying system. The drying system filters unpurified gas to supply purified gas to a pneumatic system with a purge percentage for purging moisture previously retained. The mechanism includes a valve body, first and second pistons, and a control means. The body defines first and second bores, first and second supply passages, first and second output ports, and first and second purge ports. Through the control means, the first piston occupies a supply position while the second piston occupies a purge position and vice versa. When the first piston occupies the supply position, unpurified gas flows from the first passage through the first bore through the first output port and communication between the first output port and the first purge port ceases. When the first piston occupies the purge position, remoisturized gas flows from the first output port through the first bore through the first purge port and communication between the first passage and the first output port ceases. When the second piston occupies the supply position, unpurified gas flows from the second passage through the second bore through the second output port and communication between the second output port and the second purge port ceases. When the second piston occupies the purge position, remoisturized gas flows from the second output port through the second bore to the second purge port and communication between the second passage and the second output port ceases.
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