A valve comprising: a piston movable along a piston stroke axis in a first axial direction and an opposing second axial direction, the piston having a first axial end that is a distal end of the piston; and a segmented spring guide assembly (150, 152) configured to engage the distal end of the piston along the piston stroke axis, the segmented spring guide assembly comprising: a first spring guide assembly that extends distally from the piston along the piston stroke axis, the first spring guide assembly including a first spring that is a first coil spring and a first spring guide for guiding the first spring; a second spring guide assembly that extends distally from the first spring guide assembly along the piston stroke axis, the second spring guide assembly including a second spring that is a second coil spring and a second spring guide for guiding the second spring; and wherein the first spring guide assembly and the second spring guide assembly are movably connected to each other along the piston stroke axis to form the segmented guide spring assembly, and wherein when the piston travels along the piston stroke axis: the first spring engages the piston and the first spring guide, and the second spring engages the first spring guide and the second spring guide; wherein the first spring and second spring have a same span along the piston stroke axis; and characterised in that the first spring guide includes a first elongated member extending through the first spring, a first distal end of the first spring guide including a first annular lip defining a first spring seat, the second spring guide including a second elongated member extending through the second spring, a second distal end of the second spring guide including a second annular lip defining a second spring seat, and wherein when the piston travels along the piston stroke axis, the first spring engages the piston and the first annular lip and the second spring engages the first annular lip and the second annular lip. a piston movable along a piston stroke axis in a first axial direction and an opposing second axial direction, the piston having a first axial end that is a distal end of the piston; and a segmented spring guide assembly (150, 152) configured to engage the distal end of the piston along the piston stroke axis, the segmented spring guide assembly comprising: a first spring guide assembly that extends distally from the piston along the piston stroke axis, the first spring guide assembly including a first spring that is a first coil spring and a first spring guide for guiding the first spring; a second spring guide assembly that extends distally from the first spring guide assembly along the piston stroke axis, the second spring guide assembly including a second spring that is a second coil spring and a second spring guide for guiding the second spring; and a first spring guide assembly that extends distally from the piston along the piston stroke axis, the first spring guide assembly including a first spring that is a first coil spring and a first spring guide for guiding the first spring; a second spring guide assembly that extends distally from the first spring guide assembly along the piston stroke axis, the second spring guide assembly including a second spring that is a second coil spring and a second spring guide for guiding the second spring; and wherein the first spring guide assembly and the second spring guide assembly are movably connected to each other along the piston stroke axis to form the segmented guide spring assembly, and wherein when the piston travels along the piston stroke axis: the first spring engages the piston and the first spring guide, and the second spring engages the first spring guide and the second spring guide; the first spring engages the piston and the first spring guide, and the second spring engages the first spring guide and the second spring guide; wherein the first spring and second spring have a same span along the piston stroke axis; and characterised in that the first spring guide includes a first elongated member extending through the first spring, a first distal end of the first spring guide including a first annular lip defining a first spring seat, the second spring guide including a second elongated member extending through the second spring, a second distal end of the second spring guide including a second annular lip defining a second spring seat, and wherein when the piston travels along the piston stroke axis, the first spring engages the piston and the first annular lip and the second spring engages the first annular lip and the second annular lip.