Data Sheet

Control-Disk NPS 14-24 Valve
D103471X012
Product Bulletin
51.3:Control-Disk NPS 14-24
October 2013
3
Figure 1. Available S eal Configurations
Notes:
This unidirectional seal must be installed so that the retaining ring is downstream from the high pressure side of the valve at shutoff, as shown.
For this bidirectional seal, The “preferred” valve orientation places the retaining ring downstream from the high pressure side of the valve at shutoff.
1
2
E0578
1
2
SOFT SEAL WITH
BACK-UP O-RING
PHOENIX III
FIRE-TESTED SEAL
NOVEX SEAL
1
VALVE DISC
BODY
BACKUP
RING
SEAL RING
HIGH PRESSURE
AT SHUTOFF
RETAINING
RING
VALVE DISC
BODY
RETAINING
RING
GRAPHITE
GASKET
NOVEX
SEAL RING
HIGH PRESSURE
AT SHUTOFF
VALVE DISC
BODY
BACKUP
RING
RETAINING
RING
GRAPHITE
GASKET
METAL
SEAL RING
RESILIENT
INSERT
HIGH PRESSURE
AT SHUTOFF
Installation
Recommended or “preferred” installation for
Control-Disk NPS 14-24 valves is with the flow into the
shaft side of the disk (retaining ring downstream from
the high pressure side of the valve).
The standard soft seal offers ANSI/FCI 70-2 Class VI,
bidirectional shutoff. The Phoenix III seal should be
installed in the preferred direction to obtain optimal
shutoff performance, and it must be installed in the
preferred direction for fire-tested applications. The
NOVEX seal is uni-directional and should be installed in
the preferred direction.
For assistance in selecting the appropriate
combination of actuator action and open valve
position, contact your Emerson Process Management
sales office.
Standard Seal
Configurations
 Standard Soft Seal (PTFE)-- A resilient dynamic seal
with an elastomeric back-up ring for low to
moderate temperature applications.
 NOVEX Seal-- The NOVEX stainless steel seal is
available for severe service, Cryogenic, and
high-temperature applications.
 Phoenix III Seal-- This three-component,
metal-and-polymeric seal is available for severe
service with low to moderate temperature
applications.