2019•Unpublished venueRequires access
Hydraulic Valves
Noah D. Manring, Roger C. Fales
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Abstract
A good understanding of hydraulic valves is a prerequisite for understanding the control of hydraulic pumps as well as systems. This chapter considers the function and performance characteristics of hydraulic valves. It considers three valve constructions: spool valves, poppet valves, and flapper nozzle valves. Spool valves are typically used for controlling volumetric flow rates while poppet valves are typically used for controlling pressure. Flapper nozzle valves are commonly used as a first stage in a two-stage flow control valve. As it turns out, each valve type must resist its own transient and steady fluid momentum effects; and, therefore, a considerable amount of time is spent in describing the fluid flow forces that are exerted on each valve. Using these flow force characteristics, mechanical and electrohydraulic valve applications are considered as they apply to certain valve types.