Piloted relief valve


Piloted relief valve 501

Our piloted relief valve :

Lower production losses with operating pressures close to the set pressure

Better opening/closing and tightness performances than those of spring relief valves

DN 25 to DN 150
1" à 6"
PN 10 to PN100
150 to 600 lbs

Type: 501

Functions – Piloted relief valve

♦ Safety device ; in-line or on vessel

Construction – Piloted relief valve

  • Construction materials: Carbon Steel (CS), Stainless Steel (SS), Duplex & Super Duplex, Inconel & Incoloy®, Titanium, Zirconium, Uranus® B6, Tantalum, Nickel, Hastelloy®, Monel
  • Construction methods: Fabricated (Welded), Cast, Solid

Uses – Piloted relief valve

  • Service conditions: High pressure, Low temperature, Corrosion, High viscosity
  • Types of fluids: Liquids, Liquids with solid particles – Slurry, Gas, High viscosity fluids
  • Applications: Fine chemicals, Petrochemicals, Nuclear and Naval / Submarine, Other applications

Features & Options

Piloted relief valve 501

DN 25 to DN 150
1" à 6"
PN 10 to PN100
150 to 600 lbs


♦ Immediate or modulating action
♦ Operating very close to the set pressure : no production/yield loss
♦ Not sensitive to counter pressure : easier line construction, bellows not required
♦ Shorter overall dimension than spring loaded safety valves
♦ Very good tightness : the more the fluid pressure increases, the more the disc presses the nozzle ; tightness up to set pressure
♦ Easy maintenance
♦ Short or long nozzle
♦ Compliance with PED 97/23/EC.


no operator

Closing device


Options – Piloted relief valve

– check of set pressure on site
– anti back flow device
– exhaust collector
– remote operated pilot
– additional loading lever
CAUTION : some options are not compatible