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The Ultimate solution for clean service

Leser's 48x series, spring loaded safety relief and relief valves were developed in close cooperation with plant engineers and service specialists to protect sensitive process and installations against inadmissible over-pressure without putting hygienic requirements at risk.

Leser's 48x series valves are designed and manufactured to highest standards and fulfill ASME (Sec. VIII, Div. 1), FDA (3-A) and BPE (Bioprocessing Equipment - 1997) requirements, beside the European standard EN 1672/4 and those of many other countries.

Leser's 48x series valves represent the ultimate solution for all critical clean service areas of

  • Food Industry

  • Pharmaceutical Industry

  • Breweries and Beverages Industry

  • Chemical Industry

  • Cosmetics Industry

  • Special Processes

No bacteria traps or contamination due to

  • Minimum dead-leg design and flush-mounting capability

  • Wetted-part surfaces with<32 μinch (0.8 μm or 180 Grit) and less, E.P. optional

  • Gap and crevice free design of internals

  • Bellows sealed hard-to-clean internals

  • Use of FDA-approved elastomer

Type Valve Size Set Pressure Range Output Aseptic Properties
(psig) (bar)
481 1"
DN 25
1.5...986 0.1...68 low (D-E) Low dead space,
crevice free
Free discharge
483 1", 1½"
DN 25, 40
1.5...232 0.1...16 medium (F-J) Low dead space,
crevice free
Free discharge,
crevice free, no dome
488 1"... 4"
DN 25...100
3.0...232 0.2...16 very High (G-P) Reduced dead space,
crevice free
Free discharge,
crevice free, no dome
484 1", 1"
DN 25, 40
1.5...232 0.1...16 medium (F-J) Dead space free,
crevice free
Free discharge,
crevice free, no dome
485 1", 1", 2"
Dn 25, 40, 50
1.5...232 0.1...16 Medium (F-J) Dead space free,
crevice free
Free discharge,
crevice free, no dome

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