TM 5-3805-281-24-1
Theory of Operation
pressure behind the main poppet (B) is reduced
When the supply oil in the power passages (P)
creating a pressure difference across the main poppet
exceeds the relief valve pressure setting, the pilot
because oil flows out faster than oil can flow through
poppet (D) is pushed off its seat by excess supply oil
orifice (A) in the main poppet.
pressure. The oil behind main poppet (D) now flow
past the pilot poppet to the return passage (O). The oil
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