Premium-quality Double H Valve Howo engineered for extreme durability. Trusted by fleets worldwide — experience zero compromise with certified Sinotruk HOWO components. Your journey to unmatched performance starts here.
The double h valve howo is a critical pneumatic component that controls the high/low range shift in heavy‑duty transmissions, enabling smooth and reliable gear changes under full load. As a genuine part of Sinotruk Truck engineering, the double h valve howo ensures fast, precise range shifting without air leaks or sticking. Whether you operate a HOWO, T7H, or SITRAK, this valve replaces worn‑out original units and restores crisp splitter/range changes. Stop struggling with delayed shifts – upgrade to a brand‑new double h valve howo and experience effortless gear engagement.
Designed to withstand extreme vibration, temperature fluctuations, and contaminated air lines, the double h valve howo is built from corrosion‑resistant aluminum alloy with Viton seals. It directly replaces factory part numbers WG9700240012, WG9700240013, and AZ9725529215.
Integral pilot valve delivers instantaneous air pressure to the shift cylinder, reducing shift delay by up to 30% compared to worn valves.
Precision‑machined spool and Viton O‑rings prevent internal cross‑leaks, maintaining stable air pressure to the transmission.
Controlled exhaust damping eliminates harsh engagement, reducing driveline shock and extending transmission life.
Matches OEM mounting holes and air port orientations. No modifications needed – bolts directly to the gearbox or firewall.
| Parameter | Specification |
|---|---|
| Operating Pressure Range | 6–9 bar (85–130 psi) |
| Max Inlet Pressure | 12 bar (175 psi) |
| Flow Capacity | 800 L/min @ 7 bar |
| Port Threads | Inlet: M16×1.5; Outlet: M12×1.5 |
| Actuation Type | Pneumatic pilot (single solenoid) |
| Response Time (opening) | ≤ 25 ms |
| Response Time (closing) | ≤ 30 ms |
| Seal Material | Viton (FKM), -20°C to +120°C |
| Body Material | Die‑cast aluminum with anodized coating |
HOWO 371 / 420 / T7H (pre‑2015)
Use WG9700240012 or WG9700240013 depending on transmission type (12 vs 16 speed). Direct bolt‑on replacement.
SITRAK C7H, TH7, TX (Euro V/VI)
Requires WG9725529218 valve with integrated pressure regulator for optimized shift feel.
“My Howo 371 was slow to shift into low range. Replaced the double h valve howo with WG9700240012. Now the range change is instant. Best $50 I’ve spent.”
– Juan, Owner‑Operator, Chile“The old valve leaked air constantly, causing gear grinding. The new double h valve howo sealed perfectly. Installation took 15 minutes. Highly recommended.”
– Ahmed, Fleet Mechanic, UAE“We replaced 12 valves across our mining fleet. The reinforced mining spec valve (AZ9725529215) handles dust and vibration without issues. Great product.”
– Suresh, Mine Maintenance, India“Fast delivery to Russia. The valve came with new O‑rings and a diagram. Now my T7H shifts like new. Thank you.”
– Viktor, Fleet Supervisor, RussiaWhy a Properly Functioning Double H Valve Howo is Critical for Transmission Health – The double H valve directly controls the flow of compressed air to the range shift cylinder. A sticky or leaking valve causes incomplete engagement, leading to gear clashing and premature wear of transmission synchronizers and shift forks. Many drivers mistakenly blame the gearbox itself, while the root cause is a $50 valve. Our double h valve howo units are manufactured with hard‑anodized spools and Viton seals that resist oil mist and moisture contamination.
The valves are 100% flow‑tested before shipment, ensuring consistent actuation between 6 and 9 bar. For heavy‑duty applications (mining, logging), we offer the AZ9725529215 model with an extra‑strong return spring and dust‑proof boot. Installation is straightforward: disconnect air lines, remove two bolts, replace valve, and reconnect using color‑coded ports. We also supply pre‑cut air line kits for older trucks with brittle hoses. For fleets, keeping a spare valve on hand eliminates days of downtime. All our valves are backed by a 12‑month warranty and come with a detailed installation guide. Don’t let a tired pneumatic valve ruin your shift quality – restore precise range changes with a genuine double h valve howo.
Need help identifying your transmission type? Send us a photo of your existing valve or the gearbox tag. We will provide the exact replacement part. Genuine double h valve howo – the key to effortless gear selection.
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