B - Operations – Transporting – 63 – H
Patent
B - Operations, Transporting
63
H
138/74.11
B63H 3/00 (2006.01) B63H 3/10 (2006.01)
Patent
CA 1089331
PROPELLER PITCH AND ENGINE LOAD CONTROL APPARATUS Abstract of the Disclosure Apparatus including series-connected pitch inching pilot valve, load control pilot valve, pressure feedback valve assembly, pitch direction selector valve, and servo power cylinder assembly. A load control bypass valve is connected in parallel with the pressure feedback valve assembly and a pitch reduction damping check valve is connected in parallel with the load control pilot valve. Counterbalancing pilot signals in the pitch inching pilot valve are received from a pressure varying manual control valve and a pitch feedback transmitter; in the load control pilot valve either from a manual load control valve and a governor load feedback valve or from each side of the pressure feedback valve assembly; in the load control bypass valve from the outlets of the inching pilot valve and the load control pilot valve. A mechanical load control override mechanism automatically places the load control pilot valve in the open to fluid pressure source pos- ition when the servo power cylinder assembly is set in the neutral propeller pitch mode by the pitch direction selector valve.
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