( ( As ( ( the spool ) ( moves upward ) ) ) ( , ( it ( ( ( ( ( ( restricts ( the flow ) ) ( through ( opening 7 ) ) ) and ) ( causes ( the ( pressure ( to ( decrease ( in ( the ( reduced ( pressure ( outlet port ) ) ) ) ) ) ) ) ) ) ) 6 ) . ) ) ) )
(ROOT (S (SBAR (IN As) (S (NP (DT the) (NN spool)) (VP (VBZ moves) (ADVP (RB upward))))) (, ,) (NP (PRP it)) (VP (VP (VBZ restricts) (NP (DT the) (NN flow)) (PP (IN through) (S (VP (VBG opening) (NP (CD 7)))))) (CC and) (VP (VBZ causes) (NP (DT the) (NN pressure) (S (VP (TO to) (VP (VB decrease) (PP (IN in) (NP (DT the) (VBN reduced) (NN pressure) (NN outlet) (NN port)))))))) (NP (CD 6))) (. .)))
As the spool moves upward, it restricts the flow through opening 7 and causes the pressure to decrease in the reduced pressure outlet port 6.
(ROOT (S (S (VP (VBG Reducing) (NP (NP (DT the) (NN number)) (PP (IN of) (NP (NP (NNS molecules)) (PP (IN in) (NP (DT a) (JJ rigid) (NN container)))))))) (VP (VBZ causes) (NP (NN pressure)) (S (VP (TO to) (VP (VB decrease))))) (. .)))