Pressure balance unit

A pressure balance unit for a valve assembly, the pressure balance unit comprising:

• a first shell having a first surface, wherein the first shell defines a first bore;
• a second shell having a second surface configured to unite with the first surface, wherein the second shell defines a second bore;
• a sliding element having a shaft having a hollow core and defining an axis, a first end movable along the axis within the first bore, and a second end movable along the axis within the second bore, wherein the shaft also includes a radially extending hole that fluidly connects the hollow core and a pressure chamber;
• and
• a sleeve surrounding at least one of the first and second ends of the sliding element,
• wherein the first surface and the second surface are united to form a sealed perimeter of the pressure balancing unit and wherein the first bore and the second bore are coaxially aligned when the first surface and second surface are united.

A pressure balance unit for a valve assembly, the pressure balance unit comprising:

• a first shell defining a first bore and including a first inlet port in a longitudinal face of the first bore;
• a second shell defining a second bore and including a second inlet port in a longitudinal face of the second bore, wherein the second bore is axially aligned with the first bore;
• and
• a sliding element having a hollow core shaft defining an axis, a first end movable along the axis within the first bore, and a second end movable along the axis within the second bore, wherein a radially extending hole fluidly connects the hollow core and a pressure chamber;
• wherein the first inlet port and second inlet port define openings transverse to the axis,
• wherein the first end and the second end of the sliding element are substantially cylindrical, each end cylinder having a longitudinal axis aligned with the axis defined by the shaft, and
• wherein the sliding element further includes a sleeve on each end of the shaft.