WPDKZ Single Speed Cast Iron Worm Gearbox — WP Series

Industrial drive engineers occasionally face a specification that demands three simultaneous features from a single gearbox: mounting via a circular flange (Z-type), a direct IEC motor connection without coupling (D-type), and a hollow bore output for direct shaft insertion (K-type). Individually, each feature has its dedicated WP-series solution. Combined, they describe the WPDKZ Single Speed Cast Iron Worm Gearbox — the most feature-rich unit in the WP single-speed range, serving vessel-nozzle-mounted motorised shaft-mount drives across the pharmaceutical, chemical processing, and food manufacturing sectors globally.

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■ D+K+Z: Three Features, One Precision Cast Iron Unit

The WPDKZ is the pinnacle of the WP single-speed range feature integration: D-type IEC motor flange eliminates the coupling on the input, K-type hollow bore eliminates the coupling on the output, Z-type flange housing eliminates the mounting bracket. Three problems solved, one part ordered.

■ IEC Motor Flange (D) + Top-Entry (T-Input): Direct Overhead Motor Mount

The D-type IEC flange is positioned at the T-input location (top), allowing direct overhead motor mounting. Motor drops onto flange, four bolts, drive is complete. For ceiling-height-limited process environments, this is the most space-efficient motorised drive configuration possible.

■ Hollow Bore (K) Output: Shaft Passes Directly Through

The K-type hollow bore output eliminates the output coupling entirely. The driven shaft (agitator, screw, paddle) passes through the bore and is secured by key and keyway — no external shaft protrusion, no exposed coupling, minimum contamination surface.

■ Z-Flange Housing: Vessel/Structure Direct-Bolt

The Z-type flange housing bolts directly to vessel nozzles, structural flanges, and wall plates — eliminating the foot-mount bracket fabrication that adds to project cost and schedule.

■ D-Split Housing (D-type) for Field Maintainability

The D-type housing is inherently a split housing design. The cover can be removed while the motor remains mounted (D-flange) and the agitator shaft remains in the K-bore — worm wheel access in the most confined vessel-top installation imaginable.

■ Compact Size Range 50–135: Precisely Targeted at Small Vessel Applications

The 7 standard sizes (50–135 mm) cover the 6 Nm to 690 Nm output range that describes the majority of small-to-medium vessel, reactor, and pharmaceutical mixing drives.

⚒ Motorised Vessel Hollow-Shaft Agitators

The WPDKZ achieves the most compact possible motorised vessel agitator drive: Z-flange to vessel nozzle, D-IEC motor overhead, K-hollow bore onto agitator shaft — complete drive in one unit, zero external hardware.

⚔ GMP Pharmaceutical Vessel Drives

Pharmaceutical manufacturing vessels require the minimum number of external surfaces and coupling interfaces for contamination control. The WPDKZ triple-feature design minimises exposed drive hardware to its absolute minimum.

☵ Chemical Reactor Shaft-Mount Agitators

Chemical reactors with top-entry flange nozzles, overhead motors, and agitator shaft-mount connections represent the core WPDKZ market — a single unit for a complex engineering requirement.

⚊ Compact Panel-Mounted Equipment

Control panel and wall-mounted compact process drives that require flange mounting, direct motor connection, and hollow bore shaft output in a small package (sizes 50–135) use the WPDKZ as their single-unit solution.

⚛ Food & Beverage CIP-Compatible Drives

Food and beverage process vessels requiring CIP (clean-in-place) compatible drive units choose the WPDKZ for its minimum exposed surface design and direct motor mounting that eliminates corrosion-prone coupling hardware.

✎ ISO 9001:2000 Certified

We hold ISO 9001:2000 International Quality System Certification — the first in our industry category to achieve this standard. Every WPDKZ is manufactured, assembled, and tested under this quality framework.

✎ CE Marking

Full CE marking confirms compliance with EU Machinery Directive 2006/42/EC requirements — covering safety, design standards, and manufacturing quality for mechanical power transmission equipment.

✎ Pre-Shipment Testing

Every unit undergoes: Noise test (below 68 dB(A) at rated load), Oil leak test (30-minute pressurisation), and Torque transmission test (output torque within ±5% of rated). Failed units are reworked — not shipped.

✎ FC20+ Material Certification

Housing castings are verified by material test certificates for FC20 grade (220 MPa minimum tensile strength). Hardness testing (160–200 HB) and ultrasonic testing for internal defects are performed on size 135 and above.

“The WPDKZ is our specified gearbox for all GMP vessel agitator assemblies. The complete integration — flange to vessel, motor to flange, shaft through hollow bore — gives us the cleanest possible drive for CIP validation. Zero external coupling surfaces to clean. Exceptional product for a demanding specification.”

“Our bioreactor drives use WPDKZ exclusively. The triple-feature design is the only standard catalogue product that fully satisfies our vessel drive specification without custom fabrication. Cost-effective, reliable, and consistently manufactured. We’ve been ordering these for 7 years.”

“WPDKZ on all our glass-lined reactor agitators. The hollow bore onto the agitator shaft completely eliminated the coupling that kept corroding in our nitric acid atmosphere. D-split housing means quarterly inspections are done while the reactor is still bolted up. Enormously practical.”

“WPDKZ drives our API reactor vessels. The triple-feature design justifies the premium versus simpler products — we recover the cost differential within one maintenance cycle through reduced downtime. The compact size 50–135 range covers 95% of our vessel applications perfectly.”