IGF-1 (Insulin-Like Growth Factor 1). IGF-1 or insulin-like growth factor 1 (brand name: Increlex) is a growth factor which is very closely related to insulin. It carries the same amount of amino acids as insulin and responsible for the anabolic reactions to GH.
Spring pressure is the key factor in determining which spring should be used for which application. Camshaft design also plays an important role in determining which spring you will need. Lift is the critical spec when matching valve springs to the camshaft. The more lift you have the greater the pressure needs to be.
Note that this gauge registers both the pressure within the boiler (the top arrow), and the extraction pressure (the bottom arrow). Both arrows should be within their green regions. We will typically run the boiler pressure (the pressure of the steam) at 1.5 Bars (see the gauge).