Pressure regulator, balanced

The valve restricts the pressure at port P to the set value compared with the pressure at T.

If the hydraulic force at the sealing cone exceeds the spring force, the sealing cone lifts out of the seat and allows oil to flow to port T. The valve closes again once the pressure in port P drops again. The cushioning piston acts like a shock absorber to increase stability. The spring pretension can be adjusted at the hand wheel. Oil flows through the non-return valve when the pressure at port T is greater than at P. Since the spring chamber is separated from the oil by the stem, the pressure in T has no effect on the limiting pressure.