Says the company: “Spool type valves rely on the close fit of the spool and sleeve to limit leakage across the spools lands when closed. The poppet valve, however, uses a piston pressed against its seat by fluid pressure to prevent flow: with mating parts concentric and surface finish suitable, flow past the valve will be minimal, in this case less than five drops per minute at 210 bar pressure differential.
“This arrangement also offers excellent flow conditions when the valve is open, thereby reducing pressure losses. Additionally, when the valve is open the flow washes over the poppet and seat removing any contamination that may be present, even the smallest particles of which can cause havoc in a hydraulic system.”
www.integratedhydraulics.com
