Handles up to 26" Hg Vacuum

Specifically designed to meet the needs of filtrate pump users.

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HI Approved


The 855 was originally developed in the late 1950s at the request of a large Original Equipment Manufacturer (OEM) of vacuum filtration equipment. Mounting the flange directly to the receiver tank eliminates suction piping and minimizes NPSH problems. The design allows pumping to resume even after short periods of interrupted flow. Capable of operating in vacuum conditions up to 26″ Hg, the specially designed semi-open impeller assures pumping from a trickle to full capacity. Rugged in design and dependable in nature, the 855 is a workhorse in some of the toughest environments in the industry.

The 855 features an overhead v-belt drive arrangement as standard, with options for close-coupled units. By utilizing either belt drive or variable frequency drive, performance characteristics can be fine-tuned to match most system requirements. With a simple, vertically-split case design, the 855 may be disassembled to expose the entire wetted area. Standard features include a packed stuffing box with seal water connections provided to ensure lubrication and eliminate vacuum/air leakage. Pumps come with discharge flanges machined for both Class 150 ANSI and DIN PN10 connections.

Corrosion-resistant shafts are used to eliminate the need for shaft sleeves. Impellers are keyed to the shaft, providing a secure fit and protection, should momentary reverse rotation occur. The swing-out mount is a popular optional feature allowing inspection of the pump and quick access to the tank interior.


Flows To

700 GPM

159 m3/hr
Heads To

120 ft.

36 m
Power To

20 HP

Speeds To

2,450 RPM

Temperatures To

250° F

121° C

Hydraulic Coverage



Materials of Construction

Design Data




Flange mounting directly to the receiver tank eliminates suction piping and diminishes NPSH problems. The design allows pumping to resume even after short periods of interrupted flow.



Semi-open impellers are keyed to the shaft for secure fit.


Stuffing Box

Packed stuffing box as standard, mechanical seals are available as an option.



Sealed-for-life ball bearings on both the inboard and outboard locations ensure a long, low-maintenance life. (Single sealed-for-life ball bearings are used on 1″ x 8″ model)



Stainless steel shafts are used for corrosion resistance.


Belt Drive

System includes motor mounting plate, adjusting rods, belts, sheaves and guard.




855 Brochure

2021 (8 MB)

Technical Manuals

855 OH Series – Units Built January 2023 – Current - IOM (3 MB) Download
855 OH Series – Units Built Before January 2023 - IOM (2 MB) Download
855 Series Techbook - (2 MB) Download

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