Tuthill # 5LEV-8 Rotary Gear Pump

The Tuthill 5LEV-8 is a Cast Iron Rotary Gear Pump, Pump End Only, no motor, with an Internal Relief Valve set to 55 PSI (can be adjusted in field), standard shaft, an EPR mechanical shaft seal and o-ring, EPR elastomers, and 1 Inch NPT by 1 Inch NPT ports, replacement pump end only without a Motor. This pump is suitable for equipment, motor, or adapter mounting. This pump employs the internal gear pumping principle. Pumping action is based on a rotor, idler gear, and a cover cast with a crescent-shaped partition. The space between the outside diameter of the idler and the inside diameter of the rotor is sealed by the crescent. As the pump starts, the teeth come out of mesh, increasing the volume. The liquid fills the spaces between the teeth of the idler and the rotor and is carried past the crescent partition through the pressure side of the pump. When the teeth mesh on the pressure side, the liquid is forced from the spaces and out through the discharge port. This pump has an internal relief valve, and the adjusting screw of the relief valve is located on the suction side of the pump. The internal relief valve on this pump is designed for over-pressure protection only. It is not intended as a flow control device or for any similar use. Continuous operation of the relief valve will result in excessive heat buildup within the pump cavity that could cause serious internal damage. Make certain the adjusting screw of the relief valve is located on the suction side of the pump. Unless otherwise specified at the time of order, this pump is supplied with the standard spring, with a range of 55-120 psi, set to provide full bypass relief at 55 psi. This pump should not be used for handling plain water, corrosive or abrasive liquids or liquids not possessing adequate lubricity. Do not run the pump dry, as this could cause severe damage to the internal seal, bushings and/or metal parts.