Differential Pressure Flowmeters Our new, fully integrated differential pressure flowmeters are compact and rugged, with directly connected, large throated, non-clogging flow nozzles. This unique design reduces size and cost while minimizing errors and leaks. Simply select the flow rate and material, and you're set. There is no need to choose a primary flow element, a differential pressure gauge, and then piping. Ordering, installation, and maintenance is simplified. Everything is in one compact package. Features Large, rugged flow nozzle Bright 3.5" dial 1/2", 1" and 2" NPT ports Brass, stainless steel, or aluminum bodies New PVC version available Benefits Long life, wear-resistant design Easy to read from a distance Non-clogging Low pressure drop The Orange Research flow nozzle design is a long life, wear-resistant element that provides many years of service. Its smooth, rounded leading face reduces turbulence and backpressure. Sharp-edged orifice plates often change readings over time due to wear, even with non-abrasive fluids. Venturis are great, but their cost is often prohibitive. A flow nozzle offers the best of both worlds: a low-cost solution that wears well and has relatively low pressure drop. In our design, the flow nozzle is manifold mounted to the gauge, which minimizes leak paths and reduces overall gauge size. Other designs are much larger and do not fit into tight enclosures. Our differential pressure gauges are known worldwide as the rugged, "install them and forget them" type of flowmeters. Orange Research DP sensors are magnetically coupled to the indicator for smooth movement that withstands vibration, overpressure, and pulsations.