Pressure compensated valve

Pressure compensated valve works in open and closed modes. In open modes, water flows to the inlet in low pressure. Because of low pressure, the piston doesn’t press the spring. So, the position of the orifice and the outlet is in open position. In closed modes, water flows to the inlet in high pressure. Because of high pressure, the spring is pressed by the piston and the position of the orifice is moved. So, the diameter of the outlet becomes smaller. In conclusion, in both of the low pressure and high pressure, the volume of the water in every second which flows to the outlet is still constant.