Data Sheet

NotchFlo DST Valve
D103036X012
Product Bulletin
80.2:022
August 2014
4
Principle of Operation
NotchFlo DST control valves utilize a high resistance,
multi-stage, axial flow path (or passage) where fluid
flow is parallel to the axis of the plug and c age (see
figure 1).
Pressure reduction occurs throughout the length of
the plug; thus individual stages aren't exposed to the
full pressure differential. Therefore, trim life is
enhanced.
NotchFlo DST trim utilizes a series of notched flow
restrictions and expansions to control the pressure
drop of the fluid. The amount of pressure drop per
stage is controlled to prevent cavitation problems and
minimize erosion issues onaproperlysizedvalve.
Flow passage configuration provided by the
multi-stage plug and cage design make CL600 3-stage,
CL900 and CL1500 4-stage, and CL2500 6-stage valves
well-suited for applications involving fluids with
entrained particles. Thisisapotentiallyserious
problem for other anti-cavitation valve designs which
are subject to clogged flow passages.
Design of the trim allows for high rangeability.
Characteristics
The NotchFlo DST control valve has a linear flow
characteristic.
To maximize seat life, the trim is designed not to have
significant flow for the first 15% of travel.
The multi-stage clearance flow design helps prevent
high pressure drops in the seating area during
throttling at low capacity. This design feature extends
the shutoff capability significantly, while enhancing
throttling control capability at low travels.
Table 1. CL300 and CL600 3-Stage Available Constructions
VALVE STYLE
VALVE BODY
MATERIAL
VALVE SIZE,
NPS
END CONNECTION STYLE
(1)
Screwed RF or RTJ Flanged Butt Weld Socket Weld
Globe
WCC, LCC
(2)
,WC9,
CF8M, CF8C
1and2 X X X X
3, 4, 6, and 8 --- X X ---
Angle
SA-105, F22, F316,
and F347
1and2 X X X X
3, 4, 6, and 8 --- X X ---
X = Available Construction.
1. End connection style abbreviations: RF - Raised Face, RTJ - Ring Type Joint.
2. LCC available with RF and RTJ flanged constructions only. Contact your Emerson Pro ces s Management sales office for other end connections.
Table 2. CL900 and CL1500, 4-Stage Available Constructions
VALVE
STYLE
VALVE BODY
MATERIAL
VALVE SIZE,
NPS
END CONNECTION STYLE
(1)
RF or RTJ Flanged Butt Weld Socket Weld
Globe
WCC, LCC
(2)
,WC9,
CF8M, CF8C
1, 1-1/2, and 2 X X X
3and4 X X ---
Angle
WCC, WC9, CF8M,
CF8C
1, 1-1/2, and 2 X X X
3, 4, 6, and 8 X X ---
SA-105, F22, F316,
and F347
1, 1-1/2, and 2 X X X
3, 4, 6, and 8 X X ---
X = Available Construction.
1. End connection style abbreviations: RF - Raised Face, RTJ - Ring Type Joint.
2. LCC available with RF and RTJ flanged constructions only. Contact your Emerson Pro ces s Management sales office for other end connections.