Pvbs, Main Spools For Flow Control (Linear Characteristic) - Danfoss PVG 32 Technical Information

Technical Information
PVG 32 Proportional Valve Group
Function

PVBS, main spools for flow control (linear characteristic)

© Danfoss | November 2017
PVBS main spools with linear characteristic have less dead band than standard spools and a proportional
ratio between control signal and oil flow in the range beyond the dead band. PVBS with linear
characteristic must never be used together with PVEM electrical actuators.
The interaction between the small dead band of the spools and the hysteresis of the PVEM actuator of
20% involves a risk of building up a LS pressure in neutral position.
In a few systems load sensing pump pressure may result in unstable adjustment of the oil flow and a
tendency towards system hunting.
This may be the case with working functions that have a large moment of inertia or over-center valves. In
such systems main spools for pressure control can be advantageous.
BC00000038en-US0803 | 21