Data Sheet

A11 Valve
D500203X012
Product Bulletin
21.1:A11
May 2013
4
Figure 1. Available Seal Configurations
1
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.
2
HIGH PRESSURE
AT SHUTOFF
E0578
1
2
BACK-UP
RING
BACK-UP
RING
SEAL RING
RETAINING
RING
RETAINING
RING
RETAINING
RING
LARGEST
OUTSIDE
DIAMETER
LARGEST
OUTSIDE
DIAMETER
LARGEST
OUTSIDE
DIAMETER
LARGEST
OUTSIDE
DIAMETER
GRAPHITE
GASKET
GRAPHITE
GASKET
SEAL
RING
SEAL
RING
RESILIENT
INSERT
CRYOGENIC
SEAL RING
BODY
BODY BODY
BODY
VALVE DISC
VALVE DISC
VALVE DISC
VALVE DISC
SOFT SEAL WITH
BACK-UP O-RING
PHOENIX III
FIRE-SAFE SEAL
NOVEX SEAL
CRYOGENIC SEAL
HIGH PRESSURE
AT SHUTOFF
1
HIGH PRESSURE
AT SHUTOFF
1
HIGH PRESSURE
AT SHUTOFF
HPS
SEAL RING
GRAPHITE
GASKET
RETAINING
RING
HIGH-PRESSURE SEAL (HPS)
HIGH PRESSURE
AT SHUTOFF
1
VALVE DISC
BODY
GRAPHITE
GASKET
RETAINING
RING
BODY
VALVE DISC
SEAL
RING
METAL SEAL
HIGH PRESSURE
AT SHUTOFF
1
Installation
Preferred valve orientation for the A11 valve is reverse
flow direction. Reverse flow direction is into the side of
the valve body opposite the retaining ring or into the
shaft side of the disc.
For erosive and many severe service applications,
valves with bidirectional seals can and should be
installed with the shaft horizontal and in the forward
flow direction to prevent direct impingement of the
process media on the seal, and to minimize the
exposure of the shaft bearings to the process media.
The standard soft seal and the Phoenix III seal both
offer bidirectional shutoff. Valves using either metal,
NOVEX, or cryogenic seals are unidirectional and must
be installed in the reverse flow orientation.
For assistance in selecting the appropriate
combination of actuator action and open valve
position, consult your Emerson Process Management
sales office.
Dimensions and weights for wafer-style and
single-flangevalvesareshowninfigures3,4,5,6,
and 7.