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By certification 
Product Description
L40900 series is by changing L-20900 trim to Cage guided type Create balance force to provide larger body size available. Applicable to serve services.
The balanced trim can select with:
1.Cage single-seat type (High leakage class, small temperature range)
2.Cage double-seat type(low leakage class, big temperature range)
Product Parameters
(1)Trim: Top Guided unbalance trim
Cage retainer
Pressure relief double trim
(2)Body : Straight Angle Z type
(3)Bonnet: Standard Steam Cryogenic
(4)Temperature Range : -196℃~538℃
(5)Plug sealing : Standard Graphite Bellows
(6)Leakage :CLASS IV（Metal Seat without seal ring）
CLASS V（Metal Seat with seal ring）
(7)Flow characteristic : Equal % Linear
(8)Pipe Line Connection : Flange Welding
(9)Range ability : 50:1
