1 Max operating pressure: 400kgf/cm(use two membranes)
2 In oil pressure test won't leak etc. In pressure of 160kgf/cm
3 When use one piece of membrane and the spring changed to 4. 5X11X0. 5, the opening pressure is 5~7kgf/cm?

4. Functions
1) Benefit to long way transfer the lubricating oil, keep a constant pressure in the oil tube, so that the oil pump's pressure can easily reach all lubricating points.
2) Prevent the ahead outputted oil from flowing back, strength the lubricating effect as well to avoid the oil emulsificated by the flown back oil.