A sheath (30) closes the opening (18) and embraces an inner portion of the plunger (25), whereby pumping chamber (33) is defined between the pump body (11) and the sheath (30).
一外壳(30)封闭开口(18)并包围柱塞(25)的内部，由此在泵本体(11)和外壳(30)间限定一增压室(33)。
A sheath (30) closes the opening (18) and embraces an inner portion of the plunger (25), whereby pumping chamber (33) is defined between the pump body (11) and the sheath (30).
一外壳(30)封闭开口(18)并包围柱塞(25)的内部，由此在泵本体(11)和外壳(30)间限定一增压室(33)。
应用推荐