Double valve constructed from unitary single valves

A double valve comprising:

• a first unitary valve assembly including a first outlet port, a second outlet port, and a first spool;
• a second unitary valve assembly including another first outlet port, another second outlet port and a second spool;
• a first pilot assembly coupled to the first unitary valve assembly;
• a second pilot assembly coupled to the second unitary valve assembly;
• a plate coupled to the first unitary valve assembly and the second unitary valve assembly, the plate including respective passages to provide a first common outlet passage coupled to the first outlet port and the another first outlet port and a second common outlet passage coupled to the second outlet port and the another second outlet port;
• an inlet passage, wherein the first position is a first actuated position and the second position is a second actuated position, the fluid enters the double valve through the inlet passage, and the first spool and the second spool further include a third position located between the first position and the second position, wherein the third position is an initial position,
• wherein, when the first spool and the second spool are in a first position, fluid flows through the first common outlet passage, and when the first spool and the second spool are in a second position, the fluid flows through the second common outlet passage, and
• wherein the fluid exits the double valve through the first common outlet passage when the first spool and the second spool are in the first actuated position, and the fluid exits the double valve through the second common outlet passage when the first spool and the second spool are in the second actuated position, and the fluid does not exit the double valve through either the first common outlet passage or the second common outlet passage when the first spool and the second spool are in the initial position.

A pneumatically powered machine tool comprising:

• a cylinder including a first end and a second end;
• and
• a double valve including a first unitary valve assembly including a first outlet port, a second outlet port, and a first spool, a second unitary valve assembly including another first outlet port, another second outlet port and a second spool, a first pilot assembly coupled to the first unitary valve assembly, a second pilot assembly coupled to the second unitary valve assembly, and a plate coupled to the first unitary valve assembly and the second unitary valve assembly, the plate including respective passages to provide a first common outlet passage coupled to the first outlet port and the another first outlet port and a second common outlet passage coupled to the second outlet port and the another second outlet port,
• wherein, when the first spool and the second spool are in a first position, fluid flows through the first common outlet passage to the first end of the cylinder, and when the first spool and the second spool are in a second position, the fluid flows through the second common outlet passage to the second end of the cylinder.