How the Differential-Acting Sequence Valve VDSD/B Solves the Back-Pressure Problem Without a Drain Line
Quick Overview A differential-acting sequence valve uses a piston with two unequal working areas, instead of a spring-loaded spool or poppet alone, to open a secondary circuit once the primary circuit reaches a set pressure. The HFD VDSD/B applies this principle to stay accurate even when the outlet side sees back pressure — without needing […]





