Instruction Manual
D100425X012
YD and YS Valves
October 2014
4
heat treating is to be performed, all trim parts should be removed. Contact your Emerson Process Management sales office
for additional information.
7. YD or YS control valves can be installed in any position, although the recommended position is with the actuator
vertical above the valve. For NPS 4 and 6 YS valves, size 80 or larger actuators mounted between 45 degrees above
and 45 degrees below horizontal should be supported. If forces other than normal gravitational forces are
experienced, such as vibrational forces, smaller size actuators might also need to be supported when they are not in
a vertical position. For further information, consult your Emerson Process Management sales office.
Table 2. Valve Body Sizes and End Connections
VALVES SIZE, NPS CAST IRON VALVES STEEL OR STAINLESS STEEL V ALVES
1/2, 3/4 --- NPT screwed or socket weld
1 ---
NPT screwed; CL150, 300, or 600 raised-face or ring-type
joint flanged; buttwelding; or socket weld
1-1/2, 2 NPT screwed; CL125 flat-face flanged; or CL250 raised-face flanged
NPT screwed; CL150, 300, or 600 raised-face or ring-type
joint flanged; buttwelding; or socket weld
2-1/2, 3, 4, 6 CL125 flat-face or CL250 raised-face flanged
CL150, 300, or 600 raised face or ring-type joint flanged;
or buttwelding
8 ---
CL150, 300, or 600 raised face, ring-type joint, or
buttwelding
WARNING
Personal injury could result from packing leakage. Valve packing was tightened before shipment; however, the packing
might require some readjustment to meet specific service conditions. Check with your process or safety engineer for any
additional measures that must be taken to protect against process media.
Valves with ENVIRO-SEAL live-loaded packing or HIGH-SEAL live-loaded packing will not require this initial
re-adjustment. See the Fisher instruction manuals titled ENVIRO-SEAL Packing System for Sliding-Stem Valves or
HIGH-SEAL Live-Loaded Packing System (as appropriate) for packing instructions. If you wish to convert your present
packing arrangement to ENVIRO-SEAL packing, refer to the retrofit kits listed in the parts kit subsection near the end of
this manual.
Maintenance
Valve parts are subject to normal wear and must be inspected and replaced as necessary. Inspection and maintenance
frequency depends on the severity of service conditions. This section includes instructions for trim maintenance,
packing maintenance, and ENVIRO-SEAL bellows seal bonnet replacement. All maintenance operations may be
performed with the valve in the line.
WARNING
Avoid personal injury or property damage from sudden release of process pressure or uncontrolled movement of parts.
Before performing any maintenance operations:
D Do not remove the actuator from the valve while the valve is still pressurized.
D Always wear protective gloves, clothing, and e yewear when performing any maintenance operations to avoid personal
injury.
D Disconnect any operating lines providing air pressure, electric power, or a control signal to the actuator. Be sure the
actuator cannot suddenly open or close the valve.
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