The Y43X-16Y and Y13X-16T all copper proportional pressure reducing valves are mainly composed of valve body, inlet cover, piston, outlet cover, O-ring, sealing gasket and other parts. Proportional pressure reducing valve utilizes the pressure difference in cross-sectional area between the two ends of the floating piston inside the valve to change the pressure conditions of the inlet and outlet water, achieving the purpose of pressure reduction. The proportional pressure reducing valve has a rigorous and innovative structure, smooth operation, lightweight shape, easy installation, and stable pressure reduction ratio, which reduces both "dynamic pressure" and "static pressure". The material is made of all copper or stainless steel, suitable for clean water and seawater, and is not afraid of scaling and corrosion.