Service Manual

WEICHAI EMISSION-RELATED INSTALLATION INSTRUCTIONS
HEAVY-DUTY DUAL STAGE REGULATOR:
The heavy-duty dual stage regulator vaporizes liquid propane to gaseous form and also regulates the
fuel pressure to meet the fuel pressure requirement as is shown in Figure 4.
Figure 4 Heavy-Duty Dual Stage Regulator
The HD DSR is a two stage fully mechanical regulator that is available in LPG configurations. The DSR is
normally open with a positive outlet pressure and must be used with fuel lock-off upstream to prevent
fuel flow when the engine is not cranking or running. The HD DSR is connected to the DEPR, by a low
pressure flexible hose. It also has a reference port that is connected to the fuel / air mixer for turbo-
charged applications.
Key features of the HD Dual Stage Regulator are:
- Full mechanical pressure regulation
- Can be engine or chassis mounted (vibration requirements are defined on the installation drawing).
- Flows 250 kW at the rate inlet pressure.
- 1725 kPa inlet regulated down to a 3.5 kPa outlet pressure
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