What Is a Sanitary Filter Centrifuge?

A sanitary filter centrifuge is a batch filter centrifuge designed so that every surface the product touches can be cleaned, inspected and validated without dismantling anything. On the PQS the whole upper housing turns back on a hinge, opening more than 90 degrees, so the basket, the filter medium and the inside of the casing are fully exposed at once. Combined with polished, crevice-free internal surfaces and FDA-compliant elastomers, that access is what makes the machine acceptable in an audited pharmaceutical plant — a sanitary filter centrifuge is bought for cleanliness and documentation as much as for separation performance.

Working Principle

1) Cover open, load the bag. With the flap turned fully back, the filter bag or medium is fitted and inspected from above. 2) Close and seal. The flap closes onto a hygienic seal, giving a closed process zone. 3) Feed and separate. Slurry is fed into the spinning basket; liquid passes the medium and solids build as a cake. 4) Wash. Wash liquid is distributed over the cake to displace mother liquor. 5) Spin-dry. The basket runs at full speed until the moisture target is reached. 6) Discharge and clean. The flap opens over 90 degrees and the cake is removed from above; the exposed basket and casing are then cleaned and inspected in place before the next batch.

Key Features

Full flap opening beyond 90 degrees — basket, medium and casing are all reachable at once, which is what cleaning validation actually needs.

Hygienic internal surfaces — polished 316L with no crevices, no dead corners and no threaded fasteners in the product zone.

FDA-compliant elastomers and gaskets — seals chosen for the solvents and cleaning agents you actually use.

Documentation-friendly build — material certificates, surface finish records and a design that supports your cleaning validation.

Lining options for aggressive liquors — Halar, PFA or rubber lining where the product attacks stainless steel.

Separate clean and dirty sides — the drive and bearings are isolated from the process zone, so cleaning liquid cannot reach the lubrication.

Typical Applications

A PQS sanitary filter centrifuge is chosen wherever an auditor will ask how the machine is cleaned and how you prove it, and where product changeover happens often:

• antibiotics　· vitamins　· monosodium glutamate　· dye and pigment　· dye intermediates　· pharmaceutical intermediates　· food additives　· Halar-lined duty with aggressive liquors

Selection Guide

Two full flap machines look alike from the outside; the difference is what happens inside the process zone. Choose accordingly:

Choose the PQS sanitary filter centrifuge when cleaning validation, audit readiness and frequent product changeover drive the decision. Where the product is solvent-wet and flammable, the PQZ version adds a direct drive that removes the belt as a source of both dust and friction.

Technical Specifications

Customization & Options

Halar, PFA or rubber lining; 316L or higher alloy product contact parts; FDA-compliant gasket materials selected for your solvent list; polished surfaces to an agreed Ra; CIP spray ring and drain; closed cake discharge; explosion-proof motor; variable-frequency drive with stored recipes; documentation package for validation.

FAQ

Why does the flap open more than 90 degrees?

Because cleaning and inspection are the reason the machine exists. At over 90 degrees the cover clears the basket completely, so an operator or an inspector can see and reach the whole internal surface without removing parts. Anything less forces partial dismantling, which is slower and harder to document.

What documentation comes with the machine?

Material certificates for wetted parts, gasket and elastomer specifications, surface finish records, and the operating and maintenance manual. Additional documentation to suit your own validation protocol can be agreed at order stage.

When should I specify Halar or rubber lining?

When the process liquor attacks stainless steel — strong acids, chlorides or certain halogenated solvents. The lining protects the base metal and, just as importantly, keeps iron out of your product, which matters for pharmaceutical purity and for colour in dye intermediates.

How does it compare with a bottom discharge machine for cleaning?

Bottom discharge machines are sealed continuously and discharge through a hatch, which is excellent for long campaigns of one product. For frequent changeover and for validation, a full flap machine wins, because all the surfaces that touch product are exposed at once.

Can the drive and bearings be reached for maintenance?

Yes. The drive and bearing housing are isolated from the process zone, so they can be serviced without opening the sanitary side. That separation also protects the bearings from cleaning liquids and from process dust.

Why Jiangsu Shengli Centrifuge

Jiangsu Shengli Centrifuge Manufacturing Co., Ltd. builds this equipment in a 158,905 m2 plant with in-house machining, hard-facing and rotor dynamic balancing. The company holds ISO 9001, ISO 14001 and ISO 45001 certification, CE marking and more than 30 patents, and has supplied machines to customers in over 30 countries. Every unit is balanced and run-tested before shipment, and the balancing report is supplied with the machine.

Request a Quote or a Free Separation Test

Send us a sample of your material and we will run it on a pilot machine, then report the measured moisture, throughput and clarity before you order. Tell us your material and your target, and our engineers will recommend the model, the material of construction and the options that fit.