What is the difference between the MY-1S and the standard MY series?

The MY-1S adds a spur gear stage to the same MY worm gear platform, covering the high-torque range from 1,000 to 170,000 Nm across 14 models, while the standard MY serves lower torque and gear ratio requirements for smaller valves.

What is a manual worm valve gearbox?

A manual worm valve gearbox is a hand-operated gear operator that uses a worm-and-wheel gear pair to multiply input torque for part-turn or multi-turn valves. The self-locking gear set holds the valve in position without additional brakes.

How do I select the right manual worm valve gearbox?

Match the gearbox to your valve type, required output torque with a safety factor, ISO 5211 flange size, and stem connection. See our selection guide for a step-by-step method.

How do I choose housing and gear materials for a worm valve gearbox?

Ductile iron and WCB cast steel suit general service, SS304/316 stainless steel resists rust and corrosive media, and LCC/LCB/LC1 low-temperature steel works down to -59°C. Bronze worm wheels are recommended for high loads or frequent operation.

MY-1S Worm Valve Gearbox, 1,000–170,000 Nm

Name: MY-1S Series Manual Part-turn or Multi-turn Worm Valve Gearbox
Brand: YOYAGE

Manual

Product Overview

MY-1S Worm Gear Operator

The MY-1S series is independently developed and manufactured by YOYAGE — a part-turn or multi-turn manual worm gear operator that builds on the MY worm gearbox platform with an added spur gear stage for higher torque and ratio, driving butterfly, ball and plug valves, plus three-way ball valves and other three-way valves that need full-rotation multi-turn operation. The precise-cast housing is available in multiple materials to suit different media and working conditions; together with the self-locking worm gear pair and tapered roller bearings, it ensures flexible and efficient operation. ISO 5211 mounting flange; IP67 as standard, IP68 optional for special environments. Manufactured in compliance with CE and ISO 9001 standards.

Standard Type: Part-turn or Multi-turn
Gear Type: Worm Gear
Ratio: 72:1–5280:1
Torque: 1,000–170,000 Nm
Protection: IP67 (IP68 optional)
Housing Material: Ductile Iron, WCB (common)

Inquire Now Technical Details Quality Control

Product Features

Self-locking worm gear set prevents valve back-driving
Heat-treated worm with high hardness and wear resistance
Precision-ground gears for smooth rotation and high efficiency
High-strength input shaft with protective plating
C3/C5 coating system for surface protection
Reliable bearing support for stable operation
Grease-filled lubrication for extended service life
NBR seals for enhanced sealing performance
Rigorous torque and low-temperature testing

Click to View Details

Custom Solutions

Housing materials: Ductile iron, WCB, CF8/CF8M, LCC, LCB, LC1
Full-bronze or bronze-rimmed worm wheel
Part-turn or multi-turn valve gearbox
Gear ratio customization on request
Handwheel & chainwheel size customization
Worm gear hubs customization (Valve stem)
MSS flange standard or custom connections
Handwheel locking device
Low-temperature service down to -59°C
C5 coating system
IP68 protection option

Click to View Details

Technical Parameters & Dimensions

Read our selection guide: How to Choose a Valve Gearbox for Industrial Valve Applications

(Tip: Hold Shift and scroll the mouse wheel to scroll the table horizontallyPinch to zoom the table, double-tap to reset)

Dimension Drawing D · D0 · PCD · D1×h · Φd · Keyway · H1 · H2 · K · K1 · K2 · K3 · L · L1 · ΦPD · b · L0 · M

YOYAGE MY-1S manual worm valve gearbox dimension drawing with ISO 5211 mounting flange details

Technical Parameters & Connection Size

Model	Ratio	Max TorqueN·m	Max Torquekgf·m	Input TorqueN·m	FlangeISO 5211	Flange Dia.D	Bolt Circle Dia.PCD D0	Bolt SpecN-H-DP	ConvexD1×h	Max Stem Dia.Φd	Keyway
MY-0-1S	72:1	1,000	102	54	F12	150	125	4-M12-18	85×3	38	12×8
MY-1-1S	85:1	1,850	188	84	F14	175	140	4-M16-24	100×4	45	14×9
MY-2-1S	122:1	3,000	306	96	F16	210	165	4-M20-30	130×5	55	16×10
MY-3-1S	187:1	4,500	408	93	(F20)	250	205	8-M16-24	140×5	65	20×12
MY-4-1S	190:1	6,500	663	131	F25	300	254	8-M16-24	200×5	80	22×14
MY-4-1SZ	335:1	8,000	816	96	F25	300	254	8-M16-24	200×5	80	22×14
MY-5-1S	273:1	10,000	1,020	103	F30	350	298	8-M20-27	230×5	105	28×16
MY-5-1SZ	625:1	15,000	1,530	96	F30	350	298	8-M20-30	230×5	105	28×16
MY-6-1S	408:1	15,000	1,531	147	F35	415	356	8-M30-45	260×5	115	32×18
MY-6-1SZ	952:1	18,000	1,836	79	F35	415	356	8-M30-45	260×5	115	32×18
MY-7-1SZ	1390:1	40,000	2,857	120	F40	475	406	8-M36-54	300×8	140	36×20
MY-8-1SZ	1840:1	53,000	5,408	120	F48	560	483	12-M36-54	370×8	155	40×22
MY-9-1SZ	4035:1	130,000	8,163	140	F60	686	603	20-M36-54	470×8	200	45×25
MY-10-1SZ	5280:1	170,000	8,163	140	F60	686	603	20-M36-54	470×8	220	50×28

Appearance Size (mm)

Model	H1	H2	K	K1	K2	K3	L	L1	ΦPD	bKey	L0	MHandwheel
MY-0-1S	66	196	89	47	47	243.5	83	153.5	15	5	32	300
MY-1-1S	75	221	89	45	58	253.5	92	163.5	21	6	36	350
MY-2-1S	92	283	108	63	62	312.5	113	222.5	21	6	36	400
MY-3-1S	111	322	110	57	60	322.5	125	232.5	28	8	46	450
MY-4-1S	145	388	140	80	100	362.5	155	262.5	28	8	46	500
MY-4-1SZ	145	388	140	80	100	383	155	283	28	8	46	500
MY-5-1S	160	404	140	70	102	395	197	295	28	8	46	600
MY-5-1SZ	160	404	140	70	102	421	197	321	28	8	46	600
MY-6-1S	200	510	179	90	112	530	230	330	32	10	61	650
MY-6-1SZ	200	510	179	90	112	556	230	356	32	10	61	650
MY-7-1SZ	225	582	188	100	140	633.5	264	433.5	38	10	61	700
MY-8-1SZ	270	670	203	100	155	676	300	476	45	12	61	750
MY-9-1SZ	315	740	230	117	176	803	368	603	45	12	61	800
MY-10-1SZ	355	765	240	125	200	852.5	370	652.5	45	12	61	800

Need MY-1S Series Selection Support?

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

Send Inquiry Explore Valve Gearbox

MY-1S Series Manual Part-turn or Multi-turn Worm Valve Gearbox