Petroleum jelly has lubricating effect and can be used to lubricate O-rings and joints of food machinery. In fact I had use it few times to lubricate O-rings of my own colloid mill. However, I read somewhere that use of it in food applications is regulated due to possible carcinogenic effect. That is scary. Good thing is I have just secured a silicone grease and I will use it for the next production and so on.
Silicone grease is the type of lubricant recommended for equipment in contact with human food. Perhaps it is the only one.
The silicone grease I got is Mares brand from Lazada, for a bit hefty prize of 900 pesos. The delivery fee is free.