LE Linear Thrust Units: 11.5-217 kN Thrust, 50-500mm Stroke

Automating linear-motion valves (single/double-seat control valves, gate valves, axial-force devices) calls for thrust and stroke, not torque. The LE series linear thrust unit converts an actuator's rotation into straight-line output: thrust from 11.5 to 217 kN, six stroke bands from 50 to 500mm, input torque 30–998 N·m, with self-locking trapezoidal screw — ex stock at about 1/2–1/3 the price of comparable imported units, fitting all major electric actuator brands (ISO 5210 flanges F10–F16), custom sizes on request. Full parameter table and linear-motion sizing guidance below.

1. LE selection table

Model	Stroke mm	Overall length mm	Input torque N·m	Max. thrust kN	Screw thread	Input/output flange
LE12.1	50/100/200/400	201–551	30	11.5	Tr32×5LH	F10 / F10
LE25.1	50/100/200/400	201–551	60	23	Tr32×5LH	F10 / F10
LE50.1	50/100/200/400	251–601	125	39	Tr32×6LH	F10 / F10
LE70.1	80/160/320/400	283–603	250	64	Tr40×7LH	F14 / F14
LE100.1	80/160/320/400	283–603	500	128	Tr40×7LH	F14 / F14
LE200.1	100/200/400/500	362–762	998	217	Tr40×8LH	F16 / F16

Each model's four stroke bands map to different overall lengths (LE12.1: 201mm at 50mm stroke, 551mm at 400mm) — pick the band by valve stroke plus margin. The output end carries a connecting thread (M12×1.25–M20×1.5 on LE12.1–LE50.1; M36×3/M42×3 from LE70.1 up) coupling directly to the valve stem.

2. Three checks for linear duty

1. Thrust against the table: required axial force (unbalance force + packing friction + seating force) × 1.2–1.5 safety factor, then pick the model — thrust calculation essentials in Sizing Electric Actuators on Linear Valves;
2. Stroke margin: size the band by full valve stroke; for modulating service keep 10–20% margin for on-site end calibration;
3. Speed estimate: stroking time = stroke ÷ (input speed ÷ conversion factor × pitch) — each model's pitch and conversion factor pair is tabulated (LE12.1: 5mm pitch, factor 0.38), so stroke times can be verified against process requirements precisely.

3. Applications

• Control-valve linear drive: single/double-seat valves needing precise linear positioning — the trapezoidal screw delivers smooth low-speed travel and power-off self-locking;
• Gate/discharge valves: the 400–500mm stroke bands cover small and mid gate valves end to end;
• General industrial linear motion: material gates, positioners, locking pins — the 11.5–217 kN thrust ladder spans them all.

Buying tip: the LE series shares the same economics as the quarter- and multi-turn lines — a regular actuator plus an LE thrust unit totals about 1/2–1/3 of an imported integrated linear actuator; ex stock, custom stroke and connecting threads on request.

Summary

• Thrust 11.5–217 kN, strokes 50–500mm in six bands — covering the vast majority of linear valve duty;
• Three checks: thrust × 1.2–1.5 against the table, stroke margin, pitch + conversion factor for stroking time;
• Trapezoidal self-locking screw: position holds on power loss — equally fit for modulating and on-off service.

Complete LE parameters and drawings (CN/EN PDFs): Gearbox Product Data download. Linear-duty sizing and quotes — submit an RFQ with valve type / required thrust / stroke.

Related reading

• Gearbox Selection Overview: Eight Series, Three Steps
• GK/BST/GZ Multi-Turn Gearboxes
• Sizing Electric Actuators for Use on Linear Valves