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Safety Valves for "Clean Service"
Type 481 483 488 484 485 448

 

                     

PDF Literature
Table of Contents  TOC
Clean Service, Small Capacity 481
Clean Service, Small or Medium Capacity 483
Clean Service, Large Capacity 488
Clean Service Flush Mount 484
Clean Service Flush Piping Mount 485
Food Quality Full Lift Safety Valve 448


LESER has developed five safety valve types, known collectively as the "48x series", for protection of systems with special cleanliness requirements ("Clean Service": systems for foodstuffs, beverages, pharmaceuticals and cosmetics). The properties common to the "48x series" are:

Features:

The five types differ in capacities and opening characteristics:

 

Type 481:

Safety relief valve for very small mass flows

Applications:

Pipelines
Stainless steel reactors / vessels

 
Type 483:

Safety relief valve for small and medium mass flows
Type 488:
Full lift safety valve for medium and large mass flows
Applications:

Autoclaves
Laboratory facilities
Beverage industry

  • Bottling plants (mixers)

  • Storage tanks

 
Type 484:
Safety relief valve with connection direct to vessel
Applications:

Fermenters
Bio-reactors
Type 485:

Safety relief valve with integrated pipework connection

Applications:

Pipework protection when direct vessel protection is impossible or not desired

  

The safety valves of the 48x series can be fitted with manually lockable lifting devices H4 to hold open at a small lift, and with pneumatic lifting devices H8 for automated systems (CIP process).

Type DN NPS Set pressure range Output Aseptic properties
(bar) (psig) Inlet Outlet
481 25
1"		 0,2...150 3,0...2175 low
(D-E)		 Low dead space,
crevice free		 Free discharge
483 25, 40
1",1 1/2"		 0,2...16 3,0...232 medium
(F-J)		 Low dead space,
crevice free		 Free discharge,
crevice free,
no dome
488 25...100
1"...4"		 0,2...16 3,0...232 very high
(K-P)		 Reduced dead space,
crevice free		 Free discharge,
crevice free,
no dome
484 25, 40
1"...1 1/2"		 0,2...16 3,0...232 medium
(F-J)		 Dead space free,
crevice free		 Free discharge,
crevice free,
no dome
485 15,25,40,50
1/2",1",1 1/2",2"		 0,2...16 3,0...232 medium
(F-J)		 Dead space free,
crevice free		 Free discharge,
crevice free,
no dome