Charge Pressure Relief Valve (Cprv) - Danfoss H1P 045 Service Manual

Service Manual
H1P 045/053/060/068 Axial Piston Single Pumps
Operation

Charge Pressure Relief Valve (CPRV)

© Danfoss | June 2020
The charge pressure relief valve is a direct acting poppet valve that opens and discharges fluid to the
pump case when pressure exceeds a designated level. The charge pressure relief valve maintains charge
pressure at a designated level above case pressure.
This level is nominally set with the pump running at 1800 min
mm²/s [150 SUS]. In forward or reverse, charge pressure will be slightly lower than in neutral position. The
model code of the pump specifies the charge pressure relief valve setting. Typical charge pressure
increase from 1.2-1.5 bar per 10 l/min [17.4-21.8 psi per 2.64 US gal/min]. For external charge flow the
CPRV is set according to the table below:
CPRV flow setting for external charge supply
Tandem 045/053 Single 045/053
30 l/min [7.9 US gal/min] 15 l/min [3.9 US gal/min]
Charge pressure relief valve
-1
(rpm), and with a fluid viscosity of 32
Single 060—165 Single 210/250
22.7 l/min [6.0 US gal/min] 40.0 l/min [10.6 US gal/min]
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