Pumps and Valves

These calculators size pumps and valves. Get hydraulic and brake horsepower and motor size, NPSH available against the pump requirement, a valve Cv from flow and pressure drop, and a relief valve orifice.

Tools in this group

• Cv Calculator (Valve Flow Coefficient) — Calculate a valve's Cv from flow and pressure drop, or the flow or pressure drop for a known Cv, for liquids or gases, with Kv alongside.
• NPSH Calculator (Available NPSH) — Enter the liquid temperature, the suction tank conditions, the static head and the suction line loss to get NPSH available and your margin over the pump's NPSHr.
• Pump Horsepower Calculator — Enter flow, head and efficiencies to get hydraulic and brake horsepower, the motor power and the next standard motor size, or a pool pump flow rate.
• Relief Valve Sizing Calculator — Enter the relieving flow, set pressure and fluid properties to get the required effective area and the smallest standard orifice letter that covers it.
• Total Dynamic Head (TDH) Calculator — Enter the flow, the lift and rise, and the suction and discharge pipes to get the head your pump must deliver.