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BST-2 BST-4 air oil transformers
BST-2 BST-4 air oil transformers are two models of BST hydraulic booster.

Their structure is the same, the difference is their equipped air cylinder size. BST-2 is equipped with a smaller air cylinder, while BST-4 is equipped with a larger air cylinder, so BST-4 increase oil pressure is larger than BST-2 air oil transformer.

As BST-2 and BST-4 air oil transformer air cylinder size is different, so their increase oil pressure ratio is different. BST-2 increase oil pressure ratio is 7, while BST-4 air oil transformer is 14, it is twice of BST-2 air oil transformer.
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