Oberdorfer model # 993RQ - Gear Pump

Oberdorfer Pump 993RQ

Oberdorfer # 993RQ

Oberdorfer catalog # 993RQ, Gear Pump End with NEMA 56C Motor Bracket Only (no motor - for close coupled pump and motor assembly ) 8 GPM, Viton Lip Shaft Seal, c/w 56C motor mounting bracket and coupling assembly (for 56C frame motor with foot). *** c/w Internal Relief Valve ***. 1/2" inch NPT Ports. *** NOTE : This catalog number has been updated by the manufacturer, and will ship as the Oberdorfer Pumps catalog # N993RQ.

Price : $ 636.32

Qty :

1-2 Days (can build)


Product Information :

Features :

Lip Seal Buna-N
Port Size:
1/2" inch NPT


Features • Rugged corrosion resistant bronze construction • Compact closecoupled design • Stainless steel shafts • Durable bronze helical gears provide quiet operation • Process lubricated carbon graphite bearings • Oring cover seal for maximum leak protection • Easy field assembly to a variety of motor frames • For bronze pedestal pumps and mechanical seal styles see model N3000 • For closecoupled ductile iron pumps see model C993 Applications These pumps are suitable for all liquids that are compatible with bronze. Most common liquids are water, oil, and mild chemicals in the pH range of 4 to 11. Viscous liquids require reduced shaft speeds of 1150 RPM or lower. Consult factory. Liquids containing solids, abrasives, powders, or paint pigments are definitely not recommended for gear pumps. If abrasives are unavoidable, use a very low shaft speed. The recommended liquid temperature range is from 32 F to 140 F for best pump life. If more extreme temperature conditions exist, factory should be consulted. Freezing of waterfilled pumps can cause damage and must be avoided. Oils at low temperatures are very viscous requiring a lower speed or extra power. SUCTION LIFT As a general rule, the suction lift should be kept at an absolute minimum by placing the pump as close to the liquid source as possible. A gear pump in new condition can lift 20 feet of water in the suction line. A foot valve preferably with builtin strainer is recommended at the beginning of the suction line. For a first startup, the pump should be primed to avoid dry running. MInimum size of the suction pipe is the size of the pump inlet port. For longer suction lines over 3 feet or for viscous liquids, the pipe should be at least one size or two sizes larger than the pump inlet port.

ROTATION AND RELIEF VALVE If the discharge line contains any throttling devices such as a shutoff valve, a spray nozzle or other restrictive device, it is necessary to have a relief valve in the system which returns the liquid to the suction side or to the tank. The relief valve is also available as part of the pump itself Rmodel pumps. However, builtin relief valves are only good for intermittent service. If used continuously, the pump will overheat. A builtin relief valve is strictly a safety device against overpressure. It will not work successfully as a pressure or flow control device. For this purpose a separate relief valve in the pressure line must be used. Unless otherwise specified, the pump motor unit is supplied by the factory for shaft rotation counterclockwise from shaft end. Reversing motor will reverse in and out ports and also requires changing relief valve location. The relief valve is always on the inlet side of this pump series. The factory pressure setting is 50 PSIG. To increase pressure, turn the relief valve adjusting screw in a clockwise direction.