Wilden”s H25 and H38 Advanced Series Metal Piston pumps have been designed for use in applications that feature very low volumes with high discharge pressures. The H25 pump (pictured here) utilizes a simplex-action piston to create approximately a 13-to-1 pressure ratio of discharge fluid to inlet air supply to generate up to 110.3 bar (1,600 PSIG). The H38 model uses a double-action piston to create a 26-to-1 pressure ratio of discharge fluid pressure to inlet air supply to generate up to 220.6 bar (3,200 psig). These capabilities make the H25 and H38 pumps cost-effective solutions for applications that require discharge pressures greater than the 1-to-1 pressure ratio that is traditionally inherent in most AODD pumps. The maximum flowrate for the H25 is 4.1 LPM (1.1 GPM), and the maximum flowrate for the H38 is 7.6 LPM (2 GPM), with a maximum inlet air pressure of 8.6 bar (125 PSIG). Both the H25 and H38 models feature wetted housings that are made of aluminum. The H25 has a maximum suction-lift capability of 7.8m dry (25.5’), while the H38’s suction-lift capability is 7.1m dry (23.2’).