Data Sheet

NotchFlo DST Valve
D103036X012
Product Bulletin
80.2:022
August 2014
22
Valve Sizing Guidelines
Standard ISA equations, sizing procedures from
Catalog 12, or Fisher Specification Manager can be
used to size NotchFlo DST control valves.
Noise calculations are best performed by using Fisher
Specification Manager. The serial stage configuration
of the NotchFlo DST design reduces valve trim noise
significantly.
Selection of the correct trim can be made by
determining the K
C
value from table 4.
Ensure that the correct K
C
valuefortheappropriate
valve size, trim type, and pressure drop are selected.
Ordering Information
When ordering, specify:
Application Information
1. Processliquid–Stateparticlesizeandtypeof
entrained impurities, if any.
2. Specific gravity of liquid
3. Temperature and vapor pressure of liquid
4. Critical pressure
5. Range of flowing inlet pressures
6. Pressure drops
a. Range of flowing pressure drops
b. Maximum at s hutoff
7. Flow rates
a. Minimum controlled flow
b. Normal flow
c. Maximum flow
8. Required C
v
9. Line size and schedule
Valve Body Information
To determine what information is needed for ordering
the valve body and trim, refer to the Specifications
section. Review the description at the right of each
specification or in the referenced tables, figures, and
bulletins, and indicate the desired choice wherever a
selection is to be made.