Hydraulic soft start relief valves
Pressure shocks in hydraulic systems can cause instability in cylinder or motor actuations and also shorten the life of both hydraulic and mechanical components. Hydraulic Cartridge Valves has two solutions to eliminate this very common issue.
The first solution is the RP*T, which is interchangeable with SUN relief cartridge valves, or can be supplied in a standard manifold. The RP*T is a pilot operated soft start balanced poppet relief valve, it ramps pressure up from a 'threshold' pressure to the 'maximum' set pressure over a fixed period of time, which is slow enough to eliminate all pressure spikes.
The second solution is the HCV 211 adjustable soft start valve. This version comes in a standalone manifold, or could be designed into a custom manifold to suit your application. The softness or hydraulic pressure ramping can be set from a few milliseconds up to several seconds depending on the severity.
Both valve solutions will eliminate pressure overrides and reduce mechanical stress. These adjustable soft start valves can be set to give extremely smooth actuation to systems that are utilising on/off/on solenoids.
They are also particularly useful on systems where cylinder bounce occurs on a counterbalanced lowering load. The pressure rate will gradually build up giving the counterbalance valve a chance to open slowly in a controlled manner, eliminating the shudder and flexing.