User Guide

High-Capacity Rotary Valves
Product Flier
PF51.3:Vee-Ball
May 2009
17
Actuator-Valve Selection — Shutoff Pressure Drops
Note
The intent of the actuator-valve
selection tables is to present an
actuator size that will control a
relatively high valve pressure drop
with a standard actuator operating
pressure. It is not implied that the
selection shown is best for your
application.
For pressure drops lower than those
shown, a lower actuator pressure or
smaller actuator might be satisfactory.
For pressure drops higher than those
shown, a higher operating pressure or
larger actuator will be required.
Contact your Emerson Process
Management sales office for other
sizes and operating pressures.
With rotary valves, the highest pressure drop occurs
when the valve is shut off. When the valve is open,
pressure drop is normally much lower. However,
pressure drop capabilities of a rotary valve also are
lower when the valve is open. The allowable flowing
pressure drop across a valve depends on the valve
construction, on the type of flowing fluid (liquid or
gas), and on the vapor pressure and critical pressure
ratio of liquids.
Only allowable shutoff pressure drops are shown
here. To determine the allowable flowing pressure
drop, provide your Emerson Process Management
sales office with the application information shown
on page 23.
Do not exceed any other limits presented in this flier.
Following is a brief reminder of some of those limits:
Maximum Shutoff Pressure Drop . . . Do not
exceed any of the pressure drops in these tables or
in the Maximum Allowable Shutoff Pressure Drops
section.
Maximum Inlet Pressure and Temperature . . . Do
not exceed the maximum rating of the valve: PN 10
through 100 or CL150 through CL600. Refer to the
Body Materials, End Connections, and Ratings
section.
Materials Temperature
Limits . . . Refer to the Valve Materials and
Temperatures section, the actuator specifications
tables, and the accessories specifications tables.
Some of the critical limits are repeated here.
Table 15. Temperature Capabilities Summary
PROCESS
TEMPERATURE
Minimum for all
types
Steel valve material
EN: 10C
ASME: 29C
Stainless steel valve material
EN: 10C
ASME: 26C
Maximum
Valve Packing Bearing - - -
CV500 and V500
PTFE
PTFE
232C
Metal
260C
Graphite
PTFE
232C
Metal
CV500
316C (260C
with CF8M
retainer)
V500
427C
O-rings for sealed bearing
Nitrile
29 to 93C
Fluorocarbon
18 to 204C
AMBIENT TEMPERATURE
1051 and 1052 actuators
40 to 82C with nitrile elastomers and 50 to 149C with silicone
2052 actuator
45 to 80C
1061 actuator
34 to 82C (to 50C with optional materials)
DVC6020 controller and 3610J
positioners
40 to 80C