A modular check plate stops reverse flow through the P or the T port of a valve station.

Why you would fit one

Check on P stops one station back-feeding another when several functions share a manifold — without it, a heavily loaded function can push oil backwards into a lightly loaded one and make it creep.

Check on T holds a small back pressure in the return line. That keeps the line flooded and is often needed to give pilot operated valves elsewhere in the stack something to work against.

Modular valves stack. Each plate you add makes the assembly taller, so the mounting bolts must be longer — the bolt length in the table is what that single plate adds. Add up your stack and order the matching SHCS bolt set; they are not included.