To obtain a valve unit capable of preventing the fluid from flowing in by a simple circuit constitution.
An output channel 42 is communicated to a receiving hole 16 in a main valve unit 2, besides a main valve body 22 is supported to a movement free to a shaft direction in the main valve unit 2. The receiving hole 16 is communicated to the first supply channel 50 through the first valve seat 24, and also the receiving hole 16 to the second supply channel 56 through the second valve seat 34. The main valve body 22 has a valve section 22a that sits on the first valve seat 24 and the second valve seat 34 by moving the main valve body 22 between the first valve seat 24 and the second valve seat 34. The pilot valve 136 that moves the main valve body 22 by guiding the incoming and outgoing of the pilot fluid to a pilot room 126, and a open/close valve 103 that opens and closes the second supply channel 56, are arranged between the first position that the valve section 22a sits on the first valve seat 24 and separates from the second valve seat 34 and the second position that the valve section 22a sits on the second valve seat 34 and separates from the first valve seat 24 in the main valve unit 2.
KUROBE MASANORI
KIKUCHI HARUHIKO
TOSHIBA MACHINE CO LTD
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