Main stage in-line pressure control cartridge with stepped retainer collar

A valve assembly, comprising:

• a tubular poppet comprising a first end, a second end opposite the first end, a hollow internal central region open at the first end and enclosed at the second end, and a poppet seat located at the second end;
• a hole set comprising at least one hole in the tubular poppet located towards the second end;
• a control sleeve attached to the second end, the control sleeve configured to slide between the second end towards the first end in an open position, wherein the open position configured such that at least a portion of the hole set is exposed creating an main flow channel between the central region and an outside region of the poppet through the hole set;
• a retainer collar positioned at the first end, the retainer collar comprising a step with a larger diameter than a retainer collar outer face;
• and
• a spring positioned around the tubular poppet and configured such that the spring naturally pushes the control sleeve towards the second end in a closed position so when the control sleeve is in the closed position the control sleeve circumferentially abuts the poppet seat which stops further movement of the control sleeve towards the second end forming a seal which extinguishes the main flow channel.