Chapter 14 is sponsored by HydraForceReducing valves are normally open and respond to outlet pressure to keep outlet flow from going above their set pressure. They also can have a bypass check valve. Reducing valves always have an external drain connected directly to tank. Any backpressure in this drain line adds to the valve’s spring setting.
Relief valves, unloading valves, sequence valves, counterbalance valves, and reducing valves are the most difficult to discern on a schematic drawing because their symbols are so similar. Take extra care when diagnosing a problem to make sure these valves are correctly identified and their function understood.
Register/Login below to access this .PDF DOWNLOAD