PSD Silent Pak pump from W.S. Darley
W.S. DARLEY & CO. has introduced the PSD Silent Pak pump, which allows for a 1,500-gpm NFPA-rated pump without a pump transmission. After working with Chelsea and Allison, Darley received approval for a 1,500-gpm rating from Chelsea when using its Model 870XAFJP-B5XV with a 200% ratio and an Allison 3000EVS transmission. The needed engine speed is 2049 rpm, so it can be matched with most engines capable of producing at least 225 net horsepower. The pump is quiet because there is no transmission.