Ma Lin prepared to adopt a different method for making Punk No. 2.
For example, the positions of these two controllable valves, he planned to set them at the top of the two air passages, so that he wouldn't have to cut and reconnect the passages.
He planned to open a large hole on the side of the main air passage, then process the shape of the openings of the two auxiliary passages to form a groove. He would then fill a metal block into the groove, which has two holes and can slide left and right. Installing the valve rod, it becomes a controllable valve, realizing alternating air passage between the left and right air passages of the steam engine.
Is it difficult to manufacture this metal block?
Indeed, it is very difficult.
How to ensure it doesn't leak air?
These two valves must be able to seal the air entrances very tightly, ensuring not a single bit of air leaks.
He remembered the valves of balls and tires, they can seal the air very tightly.
