Worm Gearbox – lt-actuation.com

LT-Q Worm Gearbox – Precision Quarter-Turn Valve Actuation

High-performance worm gearboxes designed for ball valves, butterfly valves, and plug valves, delivering reliable torque transmission, long service life, and superior sealing performance for demanding industrial applications.

PRODUCT INTRODUCTION

At present, we have four series of quarter turn worm gearbox, LT-Q, W & W+SS. LT-Q & W+SS series are for manual valve operation, DWis for electrically operated valves.

LT-Q series is for manual operation of quarter-turn valves most shaft is split type

W series is for manual operation of quarter-turn valves,integral shaft,bottom assembly

DW series is for electrical operation of quarter-turn valves,integral shaft,bottom assembly

This series adopts manual operation with dual speed ratios. The switching between high speed ratio and low speed ratio is realized by pushing and pulling the input end

Product Customization

Water-proof grade: IP 68.
Aluminium bronze worm gear.
Stainless steel or special material shaft.
Application to low-temp conditions -29°C, -46°C, -60°C, etc.
Ductile iron, WCB, Low-temp Carbon Steel, Stainless Steel body material.
Handwheel position can be designed in left side.
Handwheel diameter can be customized per operation force.

Product Features

Complete models, each model with multiple mounting flange choice, so to provide better choice.
Flange connection conforms with ISO 5211.
Fully enclosed design, internal one-time grease injection for long term service.
Standard with locking device.
Travel: 0-90° (±5° adjustable)
Default application temperature: -20°C to +120°C.
Water-proof grade: IP 67
Shaft key, flat hole, square, trapezoidal thread optional for connection with valves.
Default handwheel position on right.
Handwheel clockwise rotation to close valve, anti-clockwise rotation to open valve, same as normal practice.

BOM List of LT-Q Series

S/N	Name	Bill of Material
S/N	Name	China GB	ASTM
1	Key	GB/T699 45#	ASTMA29M-1045
2	Shaft	GB/T699 45#	ASTMA29M-1045
3	Locking Piece	GB/T700 Q235	ASTM A570 Gr.A
4	Locking Bracket	GB/T700 Q235	ASTM A570 Gr.A
5	Grease Seal	NBR	NBR
6	Bearing	GB/T18254 GCr	ASTM A295-52100
7	Shaft Bushing	GB/T699 45#	ASTM A29M-1045
8	Pin	GB/T93 65Mn	AISI1066
9	Bolt	GB169945#	ASTMA29M-1045
10	Sleeve	SF-1	SF-1
11	Pin	GB/T93 65Mn	AISI1066
12	Gasket	NBR	NBR
13	Q-ring	NBR	NBR
14	Worm Gear	GB/T12227 Q500	ASTMA53680-55-06
15	Gasket	NBR	NBR
16	Cover	GB/T12227 QT450-10 GBT12229 WCB	ASTM A536 65-45-12 ASTM A216 WCB
17	Bolt	GB1699 45#	ASTMA29M-1045
18	Position Indicator	GB/T700 Q235	ASTM A570 Gr.A
19	Bolt	GB/69945#	ASTM A29M-1045
20	Cap	NBR	NBR
21	Body	GB/T12227 QT450-10 GBT12229 WCB	ASTM A536 65-45-12 ASTM A216 WCB
22	Limit Screw	GB/T699 45#	ASTMA29M-1045
23	Gasket	NBR	NBR
24	Nut	GB/T699 45#	ASTM A29M-1045
25	Cap	PE	PE

BOM List of W Series

S/N	Name	Bill of Material
S/N	Name	China GB	ASTM
1	Bolt	GB/699 45#	ASTM A29M-1045
2	Gland	GB/T12227 QT450-10 GB/T12229 WCB	ASTM A536 65-45-12 ASTM A216 WCB
3	O-ring	NBR	NBRI
4	Bearing	GB/T18254 GCr15	ASTM A295-52100
5	Key	GB/T700 Q235	ASTM A570 Gr.A
6	Shaft	GB/T699 45#	ASTM A29M-1045
7	Bolt	GB/699 45#	ASTM A29M-1045
8	Position Indicator	GB/T700 Q235	ASTM A570 Gr.A
9	Body	GB/T12227 QT450-10 GB/T12229 WCB	ASTM A536 65-45-12 ASTM A216 WCB
10	O-ring	NBR	NBR
11	Worm Gear	GB/T12227 QT500-7	ASTM A536 80-55-0
12	O-ring	NBR	NBR
13	Bottom Cover	GB/T12227 QT450-10 GB/T12229 WCB	ASTM A536 65-45-12 ASTM A216 WCB
14	Bolt	GB/699 45#	ASTM A29M-1045
15	O-ring	NBR	NBR
16	Gland	GB/T12227 QT450-10 GB/T12229 WCB	ASTM A536 65-45-12 ASTM A216 WCB
17	Bolt	GB/699 45#	ASTM A29M-1045
18	Limit Screw	GB/T699 45#	ASTM A29M-1045
19	Gasket	NBR	NBR
20	Nut	GB/T699 45#	ASTM A29M-1045
21	Cap	PE	PE

DW Series

NO.	Description	texture of material
NO.	Description	National standard material	American Standard Material
1	Bolts	GB/699 45#	ASTM A29M-1045
2	Electric bracket	GB/T12227 QT450-10 GB/T12229 WCB	ASTM A536 65-45-12 ASTM A216 WCB
3	O-ring	NBR	NBR
4	Elastic Pin	GB/T879.2 65Mn	AIS11066
5	Key	GB/T699 45#	ASTM A29M-1045
6	Worm	GB/T699 45#	ASTM A29M-1045
7	Bearing	GB/T18254 GCr15	ASTM A295-52100
8	Bolts	GB/699 45#	ASTM A29M-1045
9	Indicator Plate	GB/T700 Q235	ASTM A570 Gr.A
10	Sealing gasket	NBR	NBR
11	Body	GB/T12227 QT450-10 GB/T12229 WCB	ASTM A536 65-45-12 ASTM A216 WCB
12	Worm Gear	GB/T12227 QT500-7	ASTM A536 80-55-06
13	Cover	GB/T12227 QT450-10 GB/T12229 WCB	ASTM A536 65-45-12 ASTM A216 WCB
14	Bolts	GB/699 45#	ASTM A29M-1045
15	Cover	GB/T12227 QT450-10 GB/T12229 WCB	ASTM A536 65-45-12 ASTM A216 WCB
16	Bolts	GB/699 45#	ASTM A29M-1045
17	Bolts	GB/T699 45#	ASTM A29M-1045
18	Combined washer	NBR	NBR
19	Nut	GB/T699 45#	ASTM A29M-1045
20	Protective cover	PE	PE

LT-Q Series

Type	Model	Technical Parameters						Mounting Flange Dimension					Outline Dimension			Handwheel Dimension
Type	Model	Optional Mounting Flange	Ratio	Output Torque Nm	Input Torque Nm	Amplification Coefficient ±15%	Max Stem mm	D1	D2	N×M-DP	D3	H	K	K1	L3	D4	B1	W
A	LT-Q01	F07	26:1	400	47	8.5	28	55	70	4×M8-12	90	3	64	34	186	15	5	250
	LT-Q01	F10	26:1	400	47	8.5	28	70	102	4×M10-15	125	3	64	34	186	15	5	250
	LT-Q02	F10	36:1	800	73	11	35	70	102	4×M10-15	125	3	72	41	193	18	6	320
		F12						85	125	4×M12-18	150	3	72	41	193
		F14						100	140	4×M16-24	175	3	74	43	207
	LT-Q03	F12	50:1	1300	87	15	45	85	125	4×M12-18	150	3	82	48	251	20	6	360
		F14						100	140	4×M16-24	175	3
		F16						130	165	4×M20-30	210	3
	LT-Q03A	F12	41:1	1600	130	12.3	45	85	125	4×M12-18	150	3	82	48	251	20	6	460
		F14						100	140	4×M16-24	175	3
		F16						130	165	4×M20-30	210	3
	LT-Q04	F14	57:1	1900	112	17	50	100	140	4×M16-24	175	3	88	54	251	20	6	460
		F16						130	165	4×M20-30	210	3	88	54	251
		F20						160	200	8×M16-24	255	3	90	54	271
	LT-Q04A	F14	47:1	2100	150	14.1	50	100	140	4×M16-24	175	3	88	54	251	20	6	500
		F16						130	165	4×M20-30	210	3	88	54	251
		F20						160	200	8×M16-24	255	3	90	54	271
	LT-Q05	F16	62:1	2350	127	18.5	65	130	165	4×M20-30	210	4	100	60	279	25	8	500
		F20						160	200	8×M16-24	255	4
		F25						200	254	8×M16-24	300	4
	LT-Q05A	F16	56:1	3000	179	16.8	65	130	165	4×M20-30	210	4	100	60	309	25	8	600
		F20						160	200	8×M16-24	255	4
		F25						200	254	8×M16-24	300	4
	LT-Q06	F16	68:1	3500	156	22.5	70	130	165	4×M20-30	210	4	100	60	309	25	8	600
		F20						160	200	8×M16-24	255	4
		F25						200	254	8×M16-24	300	4
B	LT-Q05B	F16	152:1	4000	89	45	65	130	165	4×M20-30	210	4	100	123	352	25	8	500
		F20						160	200	8×M16-24	255	4			352
		F25						200	254	8×M16-24	300	4			364
	LT-Q06B	F16	184:1	5500	95	58	70	130	165	4×M20-30	210	4	100	123	352	25	8	500
		F20						160	200	8×M16-24	255	4
		F25						200	254	8×M16-24	300	4
	LT-Q07B	F16	216:1	6500	130	50	80	130	165	4×M20-30	210	4	116	131	386	25	8	600
	LT-Q07B	F25	216:1	6500	130	50	80	200	254	8×M16-24	300	4	116	131	386	25	8	600
	LT-Q07C	F20	250:1	7500	132	57	85	160	200	8×M16-24	300	4	137	157	426	25	8	600
	LT-Q07C	F25	250:1	7500	132	57	85	200	254	8×M16-24	300	4	137	157	426	25	8	600
	LT-Q08	F25	275:1	8500	116	73	95	200	254	8×M16-24	300	4	147	164	436	25	8	600
	LT-Q08	F30	275:1	8500	116	73	95	230	298	8×M20-30	350	4	147	164	436	25	8	600
	LT-Q08B	F25	330:1	9500	108	88	95	200	254	8×M16-24	300	4	147	179	438	25	8	600
	LT-Q08B	F30	330:1	9500	108	88	95	230	298	8×M20-30	350	4	147	179	438	25	8	600
	LT-Q09B	F25	378:1	11000	116	95	115	200	254	8×M16-24	300	4	151	182	456	25	8	600
	LT-Q09B	F30	378:1	11000	116	95	115	230	298	8×M20-30	350	4	151	182	456	25	8	600
	LT-Q10B	F25	360:1	15000	165	91	115	200	254	8×M16-24	300	4	151	182	468	25	8	600
		F30						230	298	8×M20-30	350	4	151	182	468
		F35						260	356	8×M30-45	415	5	174	205	468
C	LT-Q09	F25	467:1	13500	104	130	115	200	254	8×M16-24	300	4	151	77	492	25	8	600
	LT-Q09	F30	467:1	13500	104	130	115	230	298	8×M20-30	350	4	151	77	492	25	8	600
	LT-Q10	F25	560:1	18000	115	157	115	200	254	8×M16-24	300	4	151	77	504	25	8	600
		F30						230	298	8×M20-30	350	4	151	77	504
		F35						260	356	8×M30-45	415	5	174	100	504
D	LT-QW11B	F25	804:1	24000	109	221	130	200	254	8×M16-24	350	4	183	122	541	25	8	600
		F30						230	298	8×M20-30	350	4 4
		F35						260	356	8×M30-45	415	4 4
	LT-QW11	F25	960:1	30000	115	264	130	200	254	8×M16-24	350	4	183	122	541	25	8	600
		F30						230	298	8×M20-30	350	4 4
		F35						260	356	8×M30-45	415	4 4
	LT-QW12B	F25	932:1	35000	136	256	130	200	254	8×M16-24	350	4	185	124	556	25	8	700
		F30						230	298	8×M20-30	350	4
		F35						260	356	8×M30-45	415	4
		F40						300	406	8×M36-54	475	4
	LT-QW12	F25	1110:1	40000	132	305	130	200	254	8×M16-24	350	4	185	124	556	25	8	700
		F30						230	298	8×M20-30	350	4
		F35						260	356	8×M30-45	415	4
		F40						300	406	8×M36-54	475	4
	LT-QW12D	F35	1110:1	40000	132	305	150	260	356	8×M30-45	415	4	203	135	556	25	8	700
	LT-QW12D	F40	1110:1	40000	132	305	150	300	406	8×M36-54	475	4	203	135	556	25	8	700
	LT-QW13	F30	1506:1	52000	132	394	150	230	298	8×M20-30	415	5	205	132	622	25	8	700
		F35						260	356	8×M30-45	415	5
		F40						300	406	8×M36-54	475	5
	LT-QW14	F30	1753:1	65000	142	459	150	230	298	8×M20-30	415	5	217	144	687	25	8	800
		F35						260	356	8×M30-45	415	5
		F40						300	406	8×M36-54	475	5
	LT-QW15	F35	2044:1	85000	160	528	180	260	356	8×M30-45	475	5	245	158	739	25	8	800
		F40						300	406	8×M36-54	475	5
		F48						370	483	12×M36-54	560	5
	LT-QW15B	F35	3452:1	120000	145	850	180	260	356	8×M30-45	475	5	245	158	812	25	8	800
		F40						300	406	8×M36-54	475	5
		F48						370	483	12×M36-54	560	5
	LT-QW16B	F48	3835:1	140000	165	860	210	370	483	12×M36-54	560	5	277	174	847	25	8	800
	LT-QW16B	F60	3835:1	140000	165	860	210	470	603	20×M36-54	686	5	277	174	847	25	8	800
	LT-QW17B	F48	6163:1	200000	165	1212	290	370	483	12×M36-54	560	5	290	183	989	25	8	800
	LT-QW17B	F60	6163:1	200000	165	1212	290	470	603	20×M36-54	686	5	290	183	989	25	8	800
	LT-QW18B	F48	7352:1	250000	170	1470	310	370	483	12×M36-54	560	5	316	195	1029	25	8	800
	LT-QW18B	F60	7352:1	250000	170	1470	310	470	603	20×M36-54	686	5	316	195	1029	25	8	800

W Series

Type	Model	Ratio	Technical Parameter						Standard Flange Dimension					Standard Flange Outline Dimension				Handwheel Dimension
Type	Model	Ratio	Output Torque Nm	Input Torque Nm	Amplification Coefficient ±15%	Standard flange	Optional flange	Max. stem mm	D1	D2	N×M-DP	D3	H	K	K1	L3	D4	B1	W
A	W03	44:1	1300	92	14.1	F12	(F10)-F14	45	85	125	4×M12-18	150	3	85	53	271	20	6	360
	W04	52:1	1800	120	15	F14	F12-(F16)	50	100	140	4×M16-24	175	3	88	58	279	20	6	460
	W05	51:1	2400	153	15.7	F16	(F12)-F14	65	130	165	4×M20-30	210	3	96	63	308	25	8	500
	W06	52:1	3200	189	16.9	F20	(F14)-F16-F25	70	160	200	8×M16-24	255	3	103	68	348	25	8	600
	W07	60:1	4200	240	17.5	F25	F16-F20	85	200	254	8×M16-24	300	3	114	75	382	25	8	600
B	W03-1S	110:1	1500	50	30	F12	(F10)-F14	45	85	125	4×M12-18	150	3	85	53	282	20	6	320
	W04-1S	130:1	2100	66	32	F14	F12-F16	50	100	140	4×M16-24	175	3	88	58	320	20	6	360
	W05-1S	192:1	3600	72	50	F16	(F12)-F14	65	130	165	4×M20-30	210	3	96	63	361	25	8	460
	W06-1S	195:1	4900	91	54	F20	(F14)-F16-F25	70	160	200	8×M16-24	255	3	103	68	371	25	8	500
	W07-1S	225:1	6500	116	56	F25	F16-F20	85	200	254	8×M16-24	300	3	114	75	414	25	8	600
C	W08-1SS	468:1	9000	80	113	F25	F20	95	200	254	8×M16-24	300	4	116	75	447	25	8	600
	W09-1SS	572:1	13500	88	154	F30	F25	100	230	298	8×M20-30	350	4	133	88	470	25	8	600
	W10-1SS	675:1	18000	105	172	F30	F25	115	230	298	8×M20-30	350	4	139	88	490	25	8	600
	W11-1SS	900:1	30000	120	249	F35	F25-F30	130	260	356	8×M30-45	415	4	183	122	569	25	8	600
	W12-1SS	1042:1	40000	138	289	F35	F25-F30-F40	130	260	356	8×M30-45	415	4	185	124	584	25	8	700
	W12D-1SS	1042:1	40000	138	289	F40	F35	150	300	406	8×M36-54	475	4	203	135	584	25	8	700
	W13-1SS	1506:1	52000	132	394	F40	F30-F35	150	300	406	8×M36-54	475	4	205	132	622	25	8	700
	W14-1SS	1753:1	65000	142	459	F40	F30-F35-F40	150	300	406	8×M36-54	475	5	217	144	687	25	8	800
	W15-1SS	2044:1	85000	160	528	F48	F35-F40	180	370	483	12×M36-54	560	5	245	158	739	25	8	800
	W15B-1SS	3452:1	120000	145	850	F48	F35-F40	180	370	483	12×M36-54	560	5	245	158	812	25	8	800
	W16B-1SS	3835:1	140000	165	860	F60	F48	210	470	603	20×M36-54	686	5	277	174	847	25	8	800
	W17B-1SS	6163:1	200000	165	1212	F60	F48	290	470	603	20×M36-54	686	5	290	183	989	25	8	800
	W18B-1SS	7352:1	250000	170	1470	F60	F48	310	470	603	20×M36-54	686	5	316	195	1029	25	8	800

DW Series

Type	Model	Technical Parameters									Standard Flange Dimension					Standard Flange Outline Dimension
Type	Model	Output Torque Nm	Input Torque Nm	Amplification Coefficient ±15%	Std. Ratio	Optional Ratio Range	Standard Flange	Optional Flange	Max Stem mm	D1	D2	N×M-DP	D3	H	K	K1	ISO 5210 Flange	JB 2920 Flange
A	DW03	1300	93	0.32	44:1	\	F12	(F10)-F14	45	85	125	4×M12-18	150	3	85	53	F10	2
B	DW03-1S	1300	44	0.27	110:1	65~110	F12	(F10)-F14	45	85	125	4×M12-18	150	3	85	53	F10	2
A	DW04	2000	135	0.29	52:1	\	F14	F12-(F16)	50	100	140	4×M16-24	175	3	88	58	F10	2
B	DW04-1S	2000	65	0.25	130:1	77~130	F14	F12-F16	50	100	140	4×M16-24	175	3	88	58	F10	2
A	DW05	3500	225	0.31	51:1	\	F16	(F12)-F14	65	130	165	4×M20-30	210	3	96	63	F10\F14	2\3
B	DW05-1S	3500	70	0.26	192:1	88~192	F16	(F12)-F14	65	130	165	4×M20-30	210	3	96	63	F10\F14	2\3
A	DW06	4500	270	0.32	52:1	\	F20	(F14)-F16-F25	70	160	200	8×M16-24	255	3	103	68	F10\F14	2\3
B	DW06-1S	4500	85	0.28	195:1	90~195	F20	(F14)-F16-F25	70	160	200	8×M16-24	255	3	103	68	F10\F14	2\3
A	DW07	6500	375	0.29	60:1	\	F25	F16-F20	85	200	254	8×M16-24	300	3	114	75	F10\F14\F16	2\3\4
B	DW07-1S	6500	120	0.25	225:1	103~225	F25	F16-F20	85	200	254	8×M16-24	300	3	114	75	F10\F14	2\3
A	DW08	9000	530	0.3	57:1	\	F25	F20	95	200	254	8×M16-24	300	4	116	75	F10\F14\F16	2\3\4
C	DW08-1SS	9000	80	0.24	468:1	132~468	F25	F20	95	200	254	8×M16-24	300	4	116	75	2\3

Why Choose Litong Worm Gearboxes?

Engineered for performance and reliability, Litong worm gearboxes combine precision manufacturing, certified protection standards, and robust materials to deliver long-term performance in demanding industrial environments.

Engineering-Driven Production

Advanced CNC machining and precision manufacturing ensure tight tolerances, consistent quality, and reliable performance across all worm gearbox components.

Dual IP-Certified Protection

Sealed with high-performance O-ring systems, offering IP67 as standard with optional IP68 for enhanced protection in harsh and wet environments.

ISO 9001:2015 Quality System

Comprehensive quality management covering design, production, and testing processes to ensure consistent product performance and reliability.

Broad Material Compatibility

Available in ductile iron, carbon steel, stainless steel, and low-temperature materials to meet diverse industrial and environmental requirements.

Self-Locking Worm Drive

The inherent self-locking design prevents reverse movement under load, eliminating the need for additional locking mechanisms.

In-House Factory Testing

Each unit is tested using torque, temperature, and waterproof testing systems to ensure performance, durability, and full quality traceability.

Typical Applications and Compatible Valve Types

Typical Industries

Oil and Gas: pipelines, wellheads, refineries
Power Generation: cooling water and utility systems
Chemical and Petrochemical Processing
Water and Wastewater Treatment Plants
Marine and Offshore Installations
Irrigation and Water Distribution Networks
HVAC and Building Services

Compatible Valve Types

Ball Valves (quarter-turn operation)
Butterfly Valves
Plug Valves
Gate Valves
Globe Valves
Knife Gate Valves
Valves with Manual or Actuated Override

Electric assembly drawing

FAQ – LT-Q Worm Gearboxes

Q1: What is the difference between IP67 and IP68 on the LT-Q gearbox?

IP67 provides complete dust-tight protection and resistance to temporary water immersion (up to 1 meter for a limited time). IP68 offers higher protection for continuous or deeper immersion conditions, making it suitable for flood-prone or near-water industrial environments.

Q2: What material should I select for seawater or corrosive media?

For corrosive environments such as seawater applications, stainless steel (SS304 or SS316) or special alloy materials are recommended. Additional anti-corrosion coatings can also be applied to enhance durability and service life.

Q3: Can you supply gearboxes with ISO 5211 mounting flanges?

Yes, LT-Q worm gearboxes are designed according to ISO 5211 standards and can be easily integrated with electric actuators and various valve systems.

Q4: Do you provide material traceability certificates?

Yes, full material traceability and quality documentation can be provided upon request, ensuring compliance with project and industry requirements.

Q5: What torque range does the LT-Q series cover?

The LT-Q series covers a wide torque range from approximately 400 Nm up to 300,000 Nm, suitable for small to large valve applications.

Q6: Are Litong worm gearboxes self-locking?

Yes, the worm gear design provides inherent self-locking capability, preventing reverse movement under load and eliminating the need for additional locking devices.

Partner With Litong

Litong is a trusted manufacturer of high-quality industrial worm gearboxes, bevel gearboxes, and valve actuation solutions. With advanced manufacturing capabilities and a strong focus on customization, we deliver reliable and durable products for a wide range of industrial applications.

Backed by years of engineering expertise and strict quality control systems, we are committed to providing consistent performance, fast response, and dependable support for global partners.

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LT-Q Worm Gearbox – Precision Quarter-Turn Valve Actuation

PRODUCT INTRODUCTION

LT-Q series is for manual operation of quarter-turn valves most shaft is split type

Type A (Primary Drive)

Type B (Secondary Drive)

Type C (Multi-stage Drive)

W series is for manual operation of quarter-turn valves,integral shaft,bottom assembly

Type A (Primary Drive)

Type B (Secondary Drive)

Type C (Multi-stage Drive)

DW series is for electrical operation of quarter-turn valves,integral shaft,bottom assembly

Type A (Primary Drive)

Type B (Secondary Drive)

Type C (Multi-stage Drive)

This series adopts manual operation with dual speed ratios. The switching between high speed ratio and low speed ratio is realized by pushing and pulling the input end

Type A

Type C

Product Customization

Product Features

BOM List of LT-Q Series

BOM List of W Series

DW Series

LT-Q Series

W Series

DW Series

Why Choose Litong Worm Gearboxes?

Engineering-Driven Production

Dual IP-Certified Protection

ISO 9001:2015 Quality System

Broad Material Compatibility

Self-Locking Worm Drive

In-House Factory Testing

Typical Applications and Compatible Valve Types

Typical Industries

Compatible Valve Types

Electric assembly drawing

FAQ – LT-Q Worm Gearboxes

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