弁座 is read as べんざ (benza) and means valve seat.
べんざ
benza
べんとう
bento
べんごし
lawyer
べんご
defense
べんろん
discussion
べんめい
explanation
べんかい
explanation (e.g. for one's actions)
べんさい
repayment
べんしょう
compensation
べんむかん
commissioner
べんごにん
counsel
べんぜつ
speech
べん
petal