Manual

I/P TRANSDUCERS
The “standard” 3-15 psi signal was originally designed as a transmission
signal, not a valve actuation signal. The Fluid Controls Institute (in
Standard 87-2) has recommended that a 1–17 psi air signal range be used
when directly actuating a control valve without a positioner. Powers
concurs with this recommendation, and therefore, offers a 1–17 psi I/P
transducer and a 0–30 psi I/P transducer and the Accritem pneumatic
controller for maximum close-off. 3-15 psi I/P transducers should be used
in conjunction with positioners.
POSITIONERS
Positioners are used for one or more of the following reasons:
1) To split range valves.
2) To eliminate unwanted valve movement caused by line pressure
variations
3) To minimize the effects of “stick-slip”
4) To speed response time and/or
5) To increase close-off rating when I/Ps are used.
Page 8 Form TI 596SI v2
Size Order Code
2 1⁄2″ 250
3″ 300
4″ 400
5″ 500
6″ 600
End Connections
125# Flange F
Valve Trim
Bronze B
Stainless Steel S
Action
Fail Open (Air-to-Close) X
Fail Closed (Air-to-Open) C
Packing
Teflon T
596– S I
ACTUATOR
SELECT CODE
(see below)
ACCESSORIES
SELECT CODE
(see below)
CODE PNEUMATIC DIAPHRAGM ACTUATORS
46 46 Sq. In., 1” Max Valve Stroke with Stainless Steel Springs,
adjustable start w/ 7 ~ 12 lb. Fixed span.
4X 46 Sq. In., 1” Max Valve Stroke with Extended Springs
(requires positioner), adjustable start w/22 lb. span.
1U 100 Sq. In; 8-13 psi Spring Range, (Normally Closed Valves)
1L 100 Sq. In; 3-8 psi Spring Range, (Normally Open Valves)
CODE DESCRIPTION
Bellofram 1000 I/P’S
IS 3–15 psi
TS 1–17 psi
US 3–27 psi
CONTROL/AIR TYPE 900X I/P
ES 0–30 psi
UTILITY POSITIONER AND I/P
BS 4–20 mA
UTILITY POSITIONER
PS 3-15 psi
RS 3-9 psi
SS 9-15 ps
NO ACCESSORIES
OS No Accessories
ACCESSORIES SELECT CODE
ACTUATOR SELECT CODE
ORDERING INFORMATION
© 2004 Powers, a division of Watts Water Technologies, Inc.
USA Phone: [phone] • Fax [phone]
Canada Phone: [phone] • Fax [phone]
www.powerscontrols.com
Form TI 596SI v2 0403 EDP# 6512248 Printed in U.S.A.