It consists of pneumatic piston actuator and the composition of O-type ball valve, valve core sphere using cylindricalhole.
它由气动活塞式执行机构和O型球阀组成，阀芯采用圆柱形通孔球体。
3
The company will place a corpse in a biodegradable bag and then lower the body feet first into a cylindricalhole about 76.2cm in diameter and 2.89m deep.