Pump preload valve for axial piston pumps

Product description

Some control pumps, such as the Parker PV axial piston pumps, require a minimum pressure of 20 bar to function properly. This can be imposed by a preload valve. The Wessel preload valve is available with connection sizes from ¾" to 1 1/4". It is flanged directly onto the pump connection as an intermediate block. In the valve, the flow is preloaded by a valve cone. The preload pressure is applied constantly and loss-free by a pressure reducing valve. The valve is usually set to 20 bar. If the pump pressure exceeds the preload pressure, the valve opens completely and the volume flow is passed on with almost no loss. Two ports P1 and MP are available upstream of the preload valve, from which, for example, a pilot pressure supply could be tapped.


  • suitable for axial piston pumps
  • Connection sizes 3/4"; 1"; 1 1/4"

Technische Daten

DesignConnection sizeMaximum operatingFlow rate
FC1-1DSAE 3/4" 1" 1 1/4"420 bar300/400/600 l/min