Hydraulic Overflow Valves



Hydraulic overflow valves are one of the most common types of valves to be used in hydraulic systems.

In fact, all systems which utilise a fixed-volume pump require a relief valve as a means of protecting the system from excess pressure.

There are many various designs of relief valves in use, including both direct-acting and pilot-operated valves.

Both types have their own advantages and disadvantages and are ideal for use in different systems.


  1. Maximum temperature: 150℃
  2. Material: casing of hydraulic cast iron GGG 40.
  3. Piston, valve tip, spring of hardened steel.


  • Yuken
  • Kracht
  • Besko
  • Nippon Oil Pump
  • Hp Technik

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