HELI H2000 Series, Руководство пользователя

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F F i i g g . . 7 7 . . 3 3 P P u u s s h h s s l l i i d d e e v v a a l l v v e e F F i i g g . . 7 7 . . 4 4 P P u u l l l l s s l l i i d d e e v v a a l l v v e e
7.5 Operation of relief valve 7.5 Operation of relief valve
(1) The relief valve is mounted between the cylinder port “HP” and the low- (1) The relief valve is mounted between the cylinder port “HP” and the low-
pressure passage “LP”,The oil flows through the poppet”C” and affects pressure passage “LP”,The oil flows through the poppet”C” and affects the two areas the two areas
“A” and “B” different in diameter,so that the check valve poppet “K” and the “A” and “B” different in diameter,so that the check valve poppet “K” and the
relief valve poppet “D” are securely seated.(See fig.7-5) relief valve poppet “D” are securely seated.(See fig.7-5)
(2) When the pressure in the cylinder port “HP” reaches the set pressure of the (2) When the pressure in the cylinder port “HP” reaches the set pressure of the
pil pil ot ot pop pop pet pet spr spr ing ing for for ce, ce, the the pil pil ot ot pop pop pet pet “E” “E” ope ope ns. ns. The The oil oil pas pas ses ses aro aro und und the the
poppet,flowing through the drilled hole to the low pressure side “LP”.(See fig.7-6) poppet,flowing through the drilled hole to the low pressure side “LP”.(See fig.7-6)
(3) As the pilot poppet “E” is opened,the preeure behind the poppet “C” (3) As the pilot poppet “E” is opened,the preeure behind the poppet “C”
drops,due to which the poppet “C” is moved to seat on the pilot poppet “E”.As a drops,due to which the poppet “C” is moved to seat on the pilot poppet “E”.As a
result of this,the oil flowing behind the relief valve poppet,”D” is shut off and the result of this,the oil flowing behind the relief valve poppet,”D” is shut off and the
pressure at the inner side is reduced.(See fig.7-7) pressure at the inner side is reduced.(See fig.7-7)
(4) As compared to the pressure at the (4) As compared to the pressure at the cylinder port “HP” side,the inner pressure cylinder port “HP” side,the inner pressure
becomes unbalanced,causing the relief valve poppet “D” to open and thereby sending becomes unbalanced,causing the relief valve poppet “D” to open and thereby sending
the oil directly to the low-pressure passage “LP”.(See fig.7-8) the oil directly to the low-pressure passage “LP”.(See fig.7-8)
F F i i g g . . 7 7 . . 5 5 F F i i g g . . 7 7 . . 6 6
F F i i g g . . 7 7 . . 7 7 F F i i g g . . 7 7 . . 8 8
High High
pressure pressure
Low pressure Low pressure
Low pressure Low pressure
Low pressure Low pressure
Low pressure Low pressure
High High
pressure pressure
High High
pressure pressure
High High
pressure pressure
Low pressure Low pressure
Low pressure Low pressure
Low pressure Low pressure
Low pressure Low pressure
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