LESER Type 431/433 Modulate Action Relief Valve

General design feature
LESER – Modulate Action Safety Valves offer a large number of models, materials, and accessories for adaptation to any application:

• 11 valve sizes from DN 15 to DN 150 – 1/2″ up to 6″ with connection possibilities for the respective application
• Nominal pressure ratings from PN 16 to PN 160 / Class 150 to Class 600 fulfil most pressure requirements
• Orifice 0.2 x D to > 1.1 x M cover all common performance requirements.
• The required material for the application can be chosen from the large choice of body materials, for example:
  – 0.6025 / cast iron (Series 433)
  – 0.7043 / ductile iron
  – 1.0619 / WCB
  – 1.4408 / CF8M
• Centre to face dimensions acc. to DIN 3320
• Set pressures from 0.2 to 160 bar qualify Modulate Action safety valves for all industrial systems
• Operating temperatures from -270 to 450 °C make use possible in numerous applications
  • compact construction and low weight for easy handling
  • same nominal inlet and outlet diameter
  • identical construction for steam, gasses and liquids
• (single trim) reduces the number of required spare parts and facilitates cost-effective maintenance
• Construction without a blow down ring guarantees easy service and prevents incorrect settings of the blow down ring
• The one-part spindle reduces friction, guarantees optimal guidance and reliable operation under all operating conditions
• The self-emptying angle type body prevents residue and reduces corrosion

LESER – Modulate Action safety valves can be individually adapted to the applications with a multitude of accessories.
Examples are:

• Discs with soft seal (O-ring) fulfill increased demands of functional tightness
• Stellited or hardened metal seat surfaces of disc and seat reduce the wear and increase the service life
• Balanced bellows for compensation of the back pressure and to protect the moving parts
• Heating jacket for heating the safety valve when protecting cold stiff media
• Each component can be constructed of an alternative material according to customer specifications