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Discussion History

Valve Gear

Assembly

Linkage (typically Walschaerts) that drives the valve and lets the driver vary cutoff and reverse direction. A full specification article for this item is being written. Meanwhile its bill of materials and connections are below.

Valve Gear parts and their functions

6 top-level parts · 6 parts in total · full bill of materials below
Valve Gear parts diagram: 1 eccentric crank, 2 expansion link, 3 radius rod, 4 combination lever, 5 valve spindle, 6 reversing gear. 6 parts in 6 top-level items.
Valve Gear parts diagram. Numbers match the table below; each box is one top-level part or assembly with what it contains.
#PartQtyWhat it does
1 Eccentric Crank 1× Crank on the driving wheel pin supplying the valve gear motion.
2 Expansion Link 1× Curved link whose die block position sets cutoff and direction.
3 Radius Rod 1× Rod from the expansion link die block to the valve linkage.
4 Combination Lever 1× Lever adding crosshead lead motion to the valve travel.
5 Valve Spindle 1× Rod connecting the valve gear to the piston valve.
6 Reversing Gear 1× Screw or power reverser setting cutoff and travel direction from the cab.

3D model

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Build & assembly graph

expand / collapse · shared sub-assemblies converge · links to related products · est. labour
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Bill of materials for Valve Gear

6 top-level lines · 6 rows shown · 6 parts total · indented to 3 levels
# Item / sub-assembly Part no. Qty/assy Ext. qty Parts Type
1 Eccentric Crank steam-locomotive-eccentric-crank 1× 1 · part
2 Expansion Link steam-locomotive-expansion-link 1× 1 · part
3 Radius Rod steam-locomotive-radius-rod 1× 1 · part
4 Combination Lever steam-locomotive-combination-lever 1× 1 · part
5 Valve Spindle steam-locomotive-valve-spindle 1× 1 · part
6 Reversing Gear steam-locomotive-reverser 1× 1 · part

Where the valve gear is used

1 product across 1 domain contain it, directly or inside a sub-assembly

Used in 1 assembly

Steam Locomotive

Sourcing: possible vendors

Browse the supplier directory → Prices, MOQ, and lead times are algorithmic estimates, not quotes, and not claims about these companies. Company mappings are curated by keyword; est. price band $1–$300. How estimates work
VendorHQSpecialtyMOQLead time
🇮🇳Sona Comstar
sonacomstar.com ↗ 		Gurugram, IN EV driveline & motors 1,000 pcs 8–12 wks
🇨🇳Zhejiang Shuanghuan
shdrive.cn ↗ 		Yuhuan, CN Gears & driveline 1,000 pcs 8–12 wks
🇮🇳Bharat Gears
bharatgears.com ↗ 		Mumbai, IN Automotive gears 1,000 pcs 8–12 wks
🇮🇳ZF India
zf.com ↗ 		Pune, IN Driveline & chassis 1,000 pcs 8–12 wks
🇨🇳Hangzhou Advance
advancegroup.cn ↗ 		Hangzhou, CN Gearboxes 1,000 pcs 8–12 wks