YOYAGE Valve Gearbox Advantages

Four engineering advantages behind every YOYAGE gear operator: gear-grade steel gears, multi-material housings, IP67–IP68 sealing, and C3–C5 coating protection for reliable long-term valve operation.

Gear-grade Steel Gears Multi-material Housings IP67–IP68 Sealing C3–C5 Coating

YOYAGE Advantages

Valve Gearbox Design Advantages

Four engineering decisions behind every YOYAGE gear operator.

01

Gear Material & Treatment

YOYAGE precision-machined valve gearbox bevel gear, pinion shaft and worm screw

Core gears are made from 20CrMnTi case-hardening gear steel — cut by CNC hobbing, precision ground, carburized, and quenched — reaching HRC 58–62 on the tooth surface with a tough HRC 30–45 core for long fatigue life under repeated loads. Heavy-duty worm wheels are made from QT600 ductile iron, with solid bronze and bronze-rimmed options available for low-friction, anti-seizure meshing. Output torque is verified up to 850,000 Nm before delivery.

Gear-grade Steel Grinding Heat Treatment

02

Housing Material Options

Housings come in four material families, each with its own strengths: ductile iron grades such as QT450-10 are the cost-effective choice, offering good performance at a lower price; WCB cast steel (ASTM A216) withstands higher loads, making it well suited to heavy-duty service; CF8/CF8M (SS304/316) stainless steel resists chloride attack in chemical and marine atmospheres; and LCC/LCB/LC1 low-temperature steel stays impact-tough down to -59°C.

Ductile Iron WCB Cast Steel Stainless Steel Low-temperature Steel

YOYAGE valve gear operator IP protection and sealing

IP Protection & Sealing

03

Critical sealing points are protected with O-rings and sealant to keep dust and moisture away from internal gear parts. Standard builds are sealed for general industrial environments, while IP68 upgrades with enhanced sealing designs cover outdoor, high-humidity, and buried service. Water and dust protection is verified through dedicated IP testing, and custom sealing solutions are available for applications with higher protection requirements.

IP67–IP68 O-ring Sealing Custom Sealing

YOYAGE valve gear operator coating protection

Surface Coating Protection

04

Each gearbox is finished with a multi-layer coating system following the C3 corrosion category per ISO 12944, suiting general indoor and outdoor service. For marine, chemical, and coastal installations, coating systems can be upgraded to C5 and higher categories. Coating adhesion is tested on painted housings to confirm the bond meets C3/C5 requirements, and surface coating condition is re-checked during final inspection before delivery.

C3/C5 Coating Multi-layer C5 Custom

See how these advantages are verified Manufacturing Quality Control Certifications

Choose Your Path

Standard Gearboxes or Custom-Built Solutions

Explore the complete valve gearbox range by standard type, valve, gear, and operation, or send your requirements for a custom-designed gear operator.

Browse the Valve Gearbox Range

Filter the full range by standard type, valve type, gear type, operation, and torque to narrow down 22 series.

Part-turn Valve Gearbox Multi-turn Valve Gearbox

Gate Valve Butterfly Valve Ball Valve Plug Valve Globe Valve

Worm Valve Gearbox Bevel Valve Gearbox Spur Valve Gearbox

Manual Electric Actuator Pneumatic Declutchable 3-Way Input

Browse Valve Gearboxes

Custom-Built Gearboxes

Custom valve gearbox solutions designed to your valve and application requirements, confirmed by drawings before production.

Standard Customization

Handwheel & Chainwheel Flange Connection Valve Stem Materials Gear Ratio Stem Protection Cover IP Rating Coating System

Special Customization

Dual Ratio Open Position Indicator Gearbox Combination Three-Input Design

Explore Custom Solutions

Need a Valve Gearbox Solution?

Send your valve type, size, and torque requirements to the YOYAGE team for selection support and quotation.

Send Inquiry Explore Custom Solutions