Quarter-Turn Worm Gear
Self-locking worm drives for butterfly, ball and plug valves. 150–80,000 Nm, ISO 5211 F07–F35, IP67 standard.
View Quarter-TurnProduct System · ISO 5211 / 5210 · 10–80,000 Nm
Seven product families, 60+ standard models and engineered-to-order builds — quarter-turn worm gears, bevel and multi-turn gearboxes, IP68 submersible units and OEM programs. Every unit is torque-tested before shipment.
Product Families
From compact quarter-turn operators to submersible and heavy-duty pipeline gear — each family is ISO-flange compatible and configurable to your valve torque, stem and environment.
Self-locking worm drives for butterfly, ball and plug valves. 150–80,000 Nm, ISO 5211 F07–F35, IP67 standard.
View Quarter-TurnRight-angle bevel gearboxes for remote handwheel stations and confined-space layouts. High-ratio output for gate and globe service.
View Bevel GearRising-stem and non-rising stem gear units for gate, globe and check valves. Smooth multi-turn output, ISO 5210 mounting.
View Multi-TurnHeavy-duty ductile iron housings for large-bore ball valves and high-pressure trunklines. Up to 80,000 Nm catalog rating.
View High TorqueSubmersible worm gear operators for buried service, tank farms and flood-zone installations. Continuous immersion rated.
View IP68 SeriesAluminium alloy operators for DN50–DN150 butterfly and ball valves. Low mass, IP65, ideal for HVAC and utility skids.
View Compact SeriesPrivate-label production, custom ratios, materials and interfaces. NDA-protected engineering from prototype to series.
View OEM ProgramsSelection Guide
Match break-to-open torque, turns and mounting to your valve configuration. Use the matrix below as a starting point — the quoted supplier confirm sizing on every RFQ.
| Valve Type | Recommended Family | Typical Torque | Mounting |
|---|---|---|---|
| Butterfly | Quarter-Turn / Compact | 150–12,000 Nm | ISO 5211 |
| Ball | Quarter-Turn / High Torque | 500–80,000 Nm | ISO 5211 F10–F35 |
| Gate | Multi-Turn / Bevel | 2,000–350,000 Nm | ISO 5210 |
| Globe | Multi-Turn / Bevel | 1,500–120,000 Nm | ISO 5210 / rising stem |
| Plug | Quarter-Turn / High Torque | 800–40,000 Nm | ISO 5211 |
| Diaphragm | Compact / Quarter-Turn | 80–2,500 Nm | ISO 5211 F05–F10 |
| Pinch | Compact / Multi-Turn | 200–6,000 Nm | Application-specific |
Need help sizing? See our Torque Selection Guide or online selection tools.
Industry Applications
Corrosion-resistant finishes, extended duty cycles and witness-tested lots for EPC and OEM procurement teams worldwide.
Municipal, desalination and industrial water — DN50–DN2000, IP68 buried options.
API 6D trunkline, midstream and refinery manual override packages.
Thermal, nuclear and balance-of-plant valve gear with high-cycle ratings.
Class-approved materials for shipboard and offshore platform valves.
SS316 and specialty coatings for aggressive media service.
Heavy-duty operators for slurry, tailings and abrasive valve lines.
Compact light-duty worm gears for building services and utility skids.
OEM & Custom Solutions
Private-label scope depends on the selected supplier and approved program. The RFQ and application review can cover custom ratios, materials, paint systems, nameplates and packaging — with first-article approval in a supplier-confirmed schedule for new programs.
Supplier Qualification Gate
Capabilities vary by supplier and model. These items should appear in the RFQ response before a production claim is relied upon.
Tools & Resources
Speed up procurement with calculators, CAD and standards documentation — free for registered buyers.
Selection Discipline
Use valve-maker BTO/RTO/ETO values and an explicit safety factor.
Match flange, stem geometry, center height and travel before ordering.
State ingress, corrosion, temperature and maintenance-access conditions.
Keep the model, drawing revision, rating, evidence and exceptions in writing.
FAQ
Start with valve type, bore size and break-to-open torque. Match ISO 5211 flange (quarter-turn) or ISO 5210 (multi-turn), apply a safety factor of 1.25–1.5, then confirm stem dimensions. Use our selection tools or submit an RFQ for engineering confirmation.
Standard catalog sizes (DN50–DN600) ship in the schedule confirmed in the quotation from order confirmation. In-stock fast movers can ship within the schedule confirmed in the quotation. Custom OEM builds typically require a supplier-confirmed schedule depending on tooling.
There is no MOQ on catalog products — single units for samples or spares are welcome. OEM and private-label programs typically start at 50 pieces per model.
Yes. An RFQ may request custom gear ratios, ductile iron / aluminium / stainless constructions, paint codes, nameplates and packaging. All custom drawings are handled under NDA with IP protection.
Standard catalog units are IP67. IP65 compact lines and IP68 submersible operators are available for buried, tank and marine service. See our IP67 vs IP68 guide for selection criteria.
Our combined product families cover approximately 10 Nm (light-duty compact) through 80,000 Nm (heavy quarter-turn) in catalog form, with engineered bevel and multi-turn builds rated beyond 350,000 Nm on request.