Internal Pumps

Series U Square Flange

Haight offers six sizes of pumps in the square flange U-Series. All sizes are available with a bolt-on Relief Valve which can function in either a return to suction, or return to tank mode. All U-Series pumps are interchangeable with earlier D & DR Series pumps.

Compact, rugged, and easy to maintain, these pumps are ideally suited to close-coupled mounting to the motor or footed mounting. Haight Pumps bolt-on footed brackets match standard NEMA motor height eliminating pump or motor shimming. Each bracket size is designed to align the pump and motor shaft heights without shim blocks.

• Standard motor speeds, eliminating the need for pulleys or gear reducers.
• Involute gear design to minimize noise.
• Self-lubricating gramix iron bearings.
• Easy to maintain Buna-N lip seals, installed in the UniverSeal design for simple and quick replacements or change to an alternate shaft seal type.
• Optional mounting brackets which are designed for in-line mounting with standard NEMA frame size motors.
• Optional bearing and seal materials which allow effective operation up to 625F and 600 psid.
• Simple field conversion on relief valve models to tank return mode.
• Field reversible seal ven.

The Universal Pump Design combines the innovation of our UniverSeal shaft seal, the rugged simplicity of Haight’s proven “gear within a gear” internal gear configuration, with the flexibility of a bolt-on, integral Relief Valve assembly. This combination of pump features offers pump users unsurpassed flexibility to adapt their pumps to changing system requirements.

Universal Relief Valve - the relief valve assembly can be added at any time, in the field, with no special tools. The valve can function in either the return to suction mode, or return to tank mode. Available with three different tension springs, the relief valve operates smoothly and effectively over a broad range of setting values.

“Gear within a gear” Internal gear design - For nearly seventy years, this design has demonstrated it’s effectiveness in handling a broad range of applications while operating at standard motor speeds, and reducing wear. Both of these operating characteristics play an important role in minimizing overall capital investment, and operating expenses.

Our UniverSeal shaft seal configuration represents a significant advance in gear pump design. The UniverSeal incorporates standard, easily available seal components with a readily adaptable pump geometry. The pump can be easily converted in the field from Lip to Mechanical to Packed Gland shaft seal type without even disconnecting the piping. Flow direction in the pump can also be changed without disrupting the attached piping, or special tools.

• Reduce maintenance expenses - simple, quick seal changes.
• Less production disruption and downtime - perform maintenance in place rather than in the shop.
• Reduce maintenance inventory - one pump can be adapted to meet many application requirements.
• Provide future adaptability - easily change the pump as your needs change.
• Reduce replacement parts costs, no special custom design parts.
• Interchangeable with existing Haight pumps without modification.
• Pumps specified with an integral relief valve can be quicky and easily changed to perform in either suction return, or tank return mode. The relief valve can be readily changed to operate in either clockwise or counterclockwise flow direction.

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