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Brake System

SINOTRUK HOWO Four-Circuit Protection Valve WABCO 9347144030 (Genuine, WG9000360523/1)

9347144030

Genuine WABCO four-circuit protection valve 9347144030 for SINOTRUK HOWO / A7 / Sitrak air brake systems. Crosses to WG9000360523/1, AZ87353400100, Shacman 81521516094. Not interchangeable with 9347140100. New in WABCO box, worldwide shipping.

✓ OEM number matched confirm the part number before ordering ✓ Photographed the photos are the actual part we ship ✓ Reference price $10–80 / piece, exact quote by email ✓ MOQ 1 piece · neutral packing ✓ Warranty 12 months from shipment ✓ Shipping worldwide from Jinan, 7–15 days

$10–80 / piece Factory-direct reference price · final quote confirmed within 12 h

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SINOTRUK HOWO / A7 Four-Circuit Protection Valve – WABCO 934 714 403 0 (Genuine WABCO, Original Box)

This is the original WABCO quadruple (four-circuit) protection valve, part number 934 714 403 0, supplied in genuine WABCO packaging. It is the standard air-brake valve fitted on SINOTRUK HOWO, HOWO A7 and Sitrak trucks. It splits the air supply from the air dryer into four independent brake circuits (ports 21, 22, 23, 24) and automatically isolates any circuit that fails, so a single air-line burst can never take down the whole braking system.

We stock the genuine WABCO-made valve – the same unit SINOTRUK installs on the assembly line – and ship worldwide.

Key specifications (per WABCO official data)

Part number: 934 714 403 0 (WABCO premium original quality)
Ports: 1, 4, 21, 22, 23, 24 – all M22 × 1.5
Opening pressure: circuit 21/22/24 = 6.9 bar, circuit 23 = 7.0 bar (circuit 1+2: 7.0 + 6.9 bar)
Max. operating pressure: 13 bar
Temperature range: −40°C to +90°C
Weight: 0.765 kg · Dimensions: 119 × 111.6 × 100 mm
Casting batch on the nameplate photographed: 2425 (2025 production)

Cross-reference numbers

Brand	Part number
WABCO	934 714 403 0 (this listing)
SINOTRUK (CNHTC)	WG9000360523/1 · WG9000360523/2 · WG90003605232 · AZ87353400100
Beiben	5204310306
Shaanxi / Shacman	81521516094
Foton	1525835685010 · 1612135600003 · L0356502003A0
JAC	59480-Y43G6
King Long	235500350

One valve covers HOWO, HOWO A7, Sitrak, Shacman Delong, Beiben and many Chinese heavy trucks – quote us any of the numbers above and you get this unit.

⚠ Not interchangeable with 934 714 010 0

WABCO also makes the four-circuit protection valve 934 714 010 0 (SINOTRUK WG9000360366/4). The two look similar but have different opening pressures and are NOT interchangeable – fitting the wrong one causes abnormal air-pressure build-up in the circuits. Check your old valve’s nameplate before ordering, or send us a photo and we will confirm.

Common failure symptoms

Air pressure builds up slowly or never reaches 8 bar on one or more gauges
Air keeps escaping from the exhaust / dryer continuously after charging
One circuit keeps dropping while others hold pressure
Caused mainly by oil-and-water contamination in the air line, aged diaphragms and long-term vibration

Frequently ordered together: air dryer cartridges, brake foot valves, relay valves and trailer control valves – ask us for a combined quote of the whole air-brake system.

Frequently Asked Questions

Is this a genuine WABCO valve?

Yes. We supply the WABCO-made 934 714 403 0 in original WABCO packaging - the same premium original quality unit SINOTRUK fits on HOWO, HOWO A7 and Sitrak trucks. The nameplate and casting batch (e.g. 2425) are visible in our photos.

What is the SINOTRUK cross-reference number?

WABCO 934 714 403 0 crosses to SINOTRUK (CNHTC) WG9000360523/1, WG9000360523/2, WG90003605232 and AZ87353400100. It also fits Shacman 81521516094, Beiben 5204310306, Foton, JAC and King Long applications. Quote any of these numbers - you get the same valve.

Is it the same as 934 714 010 0?

No. WABCO 934 714 010 0 (SINOTRUK WG9000360366/4) is a different four-circuit protection valve with different opening pressures. They are NOT interchangeable - the wrong one causes abnormal air-pressure output. Check the nameplate on your old valve or send us a photo before ordering.

How do I know if my four-circuit protection valve is faulty?

Typical symptoms: air pressure builds slowly or never reaches normal on one or more circuits, continuous air leaks from the exhaust after charging, or one circuit dropping pressure while others hold. The usual root causes are oil-water contamination and aged diaphragms.

What are the technical specifications?

Ports 1/4/21/22/23/24 all M22x1.5. Opening pressure 6.9 bar (circuits 21/22/24) and 7.0 bar (circuit 23); circuit 1+2 opens at 7.0 + 6.9 bar. Max operating pressure 13 bar, temperature -40C to +90C, weight 0.765 kg, dimensions 119 x 111.6 x 100 mm.