The loose seal seat structure.

密封采用活阀座结构。

youdao

Fluid pressure on one side of the gate presses it against the opposite seat with great force and improves the seal.

闸板压力侧的流体压力使另一侧的阀座受较大的力，提高了密封性。

youdao

Ball and valve seat rings are metal materials, sealing pressure than the large, rely on the media itself can not seal the pressure has reached the requirements to be imposed by external forces.

球体和阀座密封圈都采用金属材料制造，密封比压很大，依靠介质本身的压力已达不到密封的要求，必须施加外力。

youdao

After a dinner of caviar, prawn confit, duck breast and an assortment of French cheeses, a flight attendant converted Lais's seat into a mattress-topped flatbed complete with duvet and giant pillows and showed him how to seal his seat from view with a privacy screen for the rest of the 12-hour flight.

CNN: Amazing first-class air cabins