{"id":1878,"date":"2026-06-26T06:11:27","date_gmt":"2026-06-26T06:11:27","guid":{"rendered":"https:\/\/speed-reducer-gearbox.com\/product\/dks-series-top-entry-hollow-shaft-worm-gear-reducer\/"},"modified":"2026-06-26T06:11:28","modified_gmt":"2026-06-26T06:11:28","slug":"dks-series-top-entry-hollow-shaft-worm-gear-reducer","status":"publish","type":"product","link":"https:\/\/speed-reducer-gearbox.com\/zh\/product\/dks-series-top-entry-hollow-shaft-worm-gear-reducer\/","title":{"rendered":"DKS Series Top-Entry Hollow Shaft Worm Gear Reducer"},"content":{"rendered":"
\n

DKS Series — Top-Entry Hollow Shaft Worm Gear Reducer<\/h2>\n

The DKS Series positions the IEC motor flange above the worm centreline (S-type orientation) while retaining the keyed hollow shaft worm gearbox<\/strong> output that defines the DK platform. This top-entry layout is purpose-built for vertical tank-top agitator and mixer drives, where the motor sits on a bridge or platform above the vessel and the hollow bore slides over the impeller shaft descending into the tank. Thirteen frame sizes from WP40 to WP250 and ratios from 5:1 to 60:1 give process engineers full flexibility to match torque, speed, and bore diameter to the vessel geometry. The one-piece cast-iron housing seals lubricant in and process vapours out, and the direct motor-mount flange removes coupling maintenance from the equation entirely.<\/p>\n

\"DKS<\/div>\n

Typical Applications<\/h2>\n

Chemical and Pharmaceutical Tank Agitators<\/h3>\n

In reactor vessels, blending tanks, and dissolution kettles, the DKS mounts on the tank-top flange with the motor above the gearbox. The hollow bore clamps directly onto the agitator shaft, so no rigid coupling, guard, or alignment procedure is needed between the reducer output and the impeller. Chemical plants running Pfaudler glass-lined reactors or De Dietrich stirred vessels commonly pair WP80–WP135 DKS units at 20:1 or 25:1 with explosion-proof motors. The self-locking worm gearbox<\/strong> property at these ratios holds the impeller stationary during batch transfers, preventing reverse rotation from fluid backflow.<\/p>\n

Wastewater Treatment Flocculators<\/h3>\n

Slow-speed paddle flocculators in municipal and industrial water-treatment plants need gentle, steady rotation — typically 1–5 r\/min. A DKS at 50:1 or 60:1 paired with a 0.37–0.75 kW motor delivers the required speed while the right angle worm gearbox<\/strong> geometry keeps the motor above the waterline. The hollow bore slips over the flocculator shaft running through the tank wall bearing, eliminating the thrust coupling that a solid-shaft reducer would require.<\/p>\n

\"DKS<\/p>\n

S-type motor position (above) and hollow output bore detail<\/p>\n<\/div>\n

Performance Data<\/h2>\n

All torque values below apply at 1,500 r\/min input speed under continuous duty at 10–25 °C ambient. The DKS shares identical gear geometry and efficiency curves with the DA and DKA series on the same speed reducer gearbox<\/a> platform. Motor power ratings follow A02\/Y-series IEC norms.<\/p>\n

\n\n\n\n\n\n\n\n\n\n\n\n
Frame (mm)<\/th>\nMotor (kW)<\/th>\nRatios<\/th>\nTorque at 10:1 (N·m)<\/th>\nPeak Torque (N·m)<\/th>\n<\/tr>\n<\/thead>\n
WP40<\/td>\n0.12<\/td>\n5:1 – 60:1<\/td>\n6<\/td>\n20<\/td>\n<\/tr>\n
WP60<\/td>\n0.37<\/td>\n5:1 – 60:1<\/td>\n19<\/td>\n73<\/td>\n<\/tr>\n
WP80<\/td>\n0.75 – 1.5<\/td>\n5:1 – 60:1<\/td>\n77<\/td>\n248<\/td>\n<\/tr>\n
WP120<\/td>\n2.2 – 3<\/td>\n5:1 – 60:1<\/td>\n151<\/td>\n521<\/td>\n<\/tr>\n
WP155<\/td>\n5.5<\/td>\n5:1 – 60:1<\/td>\n270<\/td>\n1,260<\/td>\n<\/tr>\n
WP200<\/td>\n11<\/td>\n10:1 – 60:1<\/td>\n623<\/td>\n2,856<\/td>\n<\/tr>\n
WP250<\/td>\n11 – 15<\/td>\n10:1 – 60:1<\/td>\n850<\/td>\n3,025<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Structural Design Highlights<\/h2>\n

The DKS housing is the same one-piece grey cast-iron casting used across the entire single-stage WP range. The only tooling difference is the position of the motor-flange machining — rotated 180° relative to the DKA so the input bore faces upward. This means every internal component (worm shaft, bronze wheel, tapered roller bearings, oil seals) is fully interchangeable between the DA, DKA, and DKS, simplifying spares management for facilities that run multiple reducer variants. The foot pads on the housing are machined on two perpendicular planes, allowing the unit to be bolted to a horizontal platform or a vertical mounting bracket with equal rigidity. An oil-level sight glass on the side and a top-mounted breather plug are standard on all frames.<\/p>\n

Lubrication and Service Intervals<\/h2>\n

Use ISO VG 220–320 EP gear oil (Shell Omala, Mobil DTE, or Texaco Meropa) for temperatures up to 40 °C. When the DKS is mounted with the output shaft pointing downward into a tank, verify the oil level covers the full worm-wheel tooth depth — the fill quantity differs from horizontal installations and is noted in the frame-specific installation manual. Perform the first oil change after 100 hours, then every 2,500 hours or 12 months. At each change, inspect the magnetic drain plug for abnormal metal debris. Keep the breather plug clear of paint, dust, and process residue to prevent pressure build-up inside the housing.<\/p>\n

\"Production<\/p>\n

Gear-grinding and housing-machining lines<\/p>\n<\/div>\n

Why Work with Ever-Power Australia<\/h2>\n

Our Condell Park, NSW warehouse stocks popular DKS frame sizes alongside the complete range of DA and DKA variants, so you can consolidate your order and receive everything in a single shipment. Every unit ships with an ISO 9001-traceable test certificate and a factory oil fill. Our Sydney-based engineers can advise on bore sizing, torque-arm placement, and motor selection. We also supply complementary gearbox lines such as S-series helical-worm combination gear reducers<\/a> for applications that benefit from a helical pre-stage for higher efficiency at low ratios. Reach out to contact us<\/a> or call +61 2 9708 3322 for pricing and lead times.<\/p>\n

Frequently Asked Questions<\/h2>\n
\n1. What does “S-type” mean in the DKS designation? +<\/span><\/summary>\n
S-type indicates the motor input shaft enters from above<\/strong> the worm centreline. This positions the motor on top of the reducer, which is the standard layout for vertical tank-top agitator drives where gravity assists oil return to the lower bearing.<\/div>\n<\/details>\n
\n2. Is the hollow bore the same size as the DKA? +<\/span><\/summary>\n
Yes. Both the DKA and DKS share identical hollow-bore diameters per frame size, ranging from 14 mm (WP40) to 85 mm (WP250)<\/strong>. They differ only in the motor-flange position: below (A-type) versus above (S-type).<\/div>\n<\/details>\n
\n3. Can I use the DKS horizontally? +<\/span><\/summary>\n
Yes, but the S-type orientation is optimised for vertical or near-vertical driven shafts. For horizontal driven shafts, the DKA (A-type) is the more conventional choice as it keeps the motor weight below the gearbox centreline for better stability.<\/div>\n<\/details>\n
\n4. What lubricant level should I maintain when the DKS is mounted vertically? +<\/span><\/summary>\n
When the output shaft points straight down into a tank, the oil level should cover the worm wheel teeth fully. Consult the oil-fill diagram in the installation manual for your specific frame size and mounting angle. Over-filling can cause churning and overheating.<\/div>\n<\/details>\n
\n5. Does the DKS self-lock at all ratios? +<\/span><\/summary>\n
Reliable self-locking occurs at ratios of 30:1 and above<\/strong>. At lower ratios the output can be back-driven by the load, so a mechanical brake or ratchet should be added for vertical lifting or holding applications.<\/div>\n<\/details>\n
\n

Ready to Get Started?<\/p>\n

Call +61 2 9708 3322<\/strong>  |  Email sales@speed-reducer-gearbox.com<\/strong><\/p>\n

Request a Quote<\/a><\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"

The DKS Series is a top-entry (S-type) hollow-shaft worm gear reducer with the motor flange positioned above the worm centreline, purpose-built for vertical tank-top agitator and mixer installations. Available in 13 frame sizes (40\u2013250 mm) with ratios from 5:1 to 60:1 and output torque up to 3,025 N\u00b7m. The S-type motor orientation keeps the drive clear of process fluids while the hollow bore clamps directly onto the impeller shaft. This reducer serves as a drop-in replacement for Bonfiglioli VF-KS series and Flender FZG-type top-entry worm drives used on chemical reactor agitators.<\/p>","protected":false},"featured_media":1772,"comment_status":"open","ping_status":"closed","template":"","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":""},"product_cat":[2899],"product_tag":[],"class_list":["post-1878","product","type-product","status-publish","has-post-thumbnail","product_cat-single-worm-gear-reducer","first","instock","shipping-taxable","product-type-simple"],"_links":{"self":[{"href":"https:\/\/speed-reducer-gearbox.com\/zh\/wp-json\/wp\/v2\/product\/1878","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/speed-reducer-gearbox.com\/zh\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/speed-reducer-gearbox.com\/zh\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/speed-reducer-gearbox.com\/zh\/wp-json\/wp\/v2\/comments?post=1878"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/speed-reducer-gearbox.com\/zh\/wp-json\/wp\/v2\/media\/1772"}],"wp:attachment":[{"href":"https:\/\/speed-reducer-gearbox.com\/zh\/wp-json\/wp\/v2\/media?parent=1878"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/speed-reducer-gearbox.com\/zh\/wp-json\/wp\/v2\/product_cat?post=1878"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/speed-reducer-gearbox.com\/zh\/wp-json\/wp\/v2\/product_tag?post=1878"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}