flap и flap plate gen.

[Ludens]

Я совсем не понимаю, что это значит. Вот контекст.

Specification for 2-directions Chutes

A carbon or stainless steel flap plate would be provided fitted with pivot shaft supported in sealed for life bearings bolted to the chute plates along with shaft seals.
The flap would be operated by pneumatic cylinder fitted with multi position limit switches.
The flap could be operated while sugar is handled

[Erdferkel]

похоже на перекидной клапан с перекидной заслонкой (flap plate)
http://www.amr23.ru/product/3
http://www.elevatorspecmash.ru/catalog/9.html