High Displacement LPG Reducer

High Displacement LPG Reducer for High Power Engine

We supply a high-flow LPG reducer for larger engines. It's a two-stage diaphragm unit with wider internal passages and heavier components than standard passenger-car reducers.

The difference is in the duty cycle. A delivery truck or a bus runs at sustained high load for hours, not minutes. Standard reducers lose pressure over time under those conditions – the diaphragm fatigues, the output drifts, and the engine loses power. This one is built to hold steady.

It's not for the typical sedan conversion. It's for commercial vehicles, heavy equipment, and any LPG application where the engine works hard consistently.

Most LPG reducers on the market are designed around passenger car duty cycles – lighter loads, shorter running periods. Put one on a commercial vehicle and the weak points show up: undersized passages, thinner diaphragms that fatigue quickly, pressure regulation that can't keep up with sustained demand.

We designed this reducer for commercial use. Bigger internal flow channels, a heavier diaphragm, and a pressure regulation system that doesn't wander when the engine is under load for extended periods.

It handles engines up to 150kW. The flow rate is rated at 120m³/h at standard pressure. Primary input handles up to 22MPa, output is adjustable from 0 to 0.5MPa.

If you're converting trucks, buses, or heavy equipment to LPG, this is the reducer we'd recommend. It's matched to the duty cycle, not just the horsepower number.

Core Product Features

 

Larger internal flow passages – higher gas throughput under sustained demand

Heavier diaphragm material – resists fatigue from continuous cycling

Two-stage regulation – maintains output pressure under varying load

Adjustable output – matches different engine requirements

Cast housing – handles vibration and pressure spikes common in commercial use

Corrosion-resistant exterior coating

Main Application Scenarios

 

This reducer is for LPG conversions on commercial vehicles and heavy equipment:

Delivery trucks and vans

Buses and passenger transport

Agricultural and construction equipment

Marine applications running LPG

The common thread is sustained high-load operation – not occasional acceleration, but continuous demand. That's where standard reducers fail and this one holds up.

The housing is a single-piece casting with thicker walls than standard reducers. It resists pressure spikes and vibration damage – common issues on commercial vehicles that run rough roads.

Inside, the flow passages are wider to reduce restriction. The gas doesn't have to push through narrow channels to reach the engine.

The diaphragm is the critical part. We use a heavier compound that resists flex fatigue. On standard reducers, diaphragm failure is the number one reason for replacement – the material hardens or cracks from continuous cycling. This one takes longer to reach that point.

The pressure adjustment screw allows output tuning from 0 to 0.5MPa. Seals are LPG-compatible – they resist swelling and hardening over time.

One important note: LPG reducers require engine coolant circulation to prevent icing in cold weather. This unit has the standard coolant fittings – you'll use your existing cooling system connections. No coolant = icing = pressure instability.

Every batch goes through pre-shipment testing:

High-flow fatigue cycles

Pressure resistance at max input

Temperature cycling from -40°C to +120°C

Long-duration load simulation (continuous, not intermittent)

These tests are run longer than standard passenger-car parts. We're simulating commercial use – hours under load, not just quick test cycles.

Batch records are maintained. We can provide test summaries on request.

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