Double valve constructed from unitary single valves

A double valve comprising:

• first and second unitary valve assemblies each having a respective inlet port, a respective outlet port, a respective exhaust port, a respective first cross-mirror port, and a respective second cross-mirror port, wherein said first and second unitary valve assemblies are comprised of base-mounted valves having bases conforming to standard dimensions;
• first and second pilot assemblies coupled to said first and second unitary valve assemblies, respectively;
• and
• a plate coupled to said first and second unitary valve assemblies including a plurality of ports on a face adjacent said first and second unitary valve assemblies interconnected by respective passages within said plate to provide a common inlet port coupled to said respective inlet ports of said first and second unitary valve assemblies, a common outlet port coupled to said respective outlet ports of said first and second unitary valve assemblies, a common exhaust port coupled to said respective exhaust ports of said first and second unitary valve assemblies, a first cross-connection between said first cross-mirror port of said first unitary valve body and said second cross-mirror port of said second unitary valve body, and a second cross-connection between said second cross-mirror port of said first unitary valve body and said first cross-mirror port of said second unitary valve body.