Instruction Manual
D103553X012
Large ET and ED Valves
July 2017
8
4. Hex nuts (key 16) attach the bonnet (key 35) to the valve body. Loosen these nuts or cap screws approximately 3
mm (1/8 inch). Then loosen the body‐to‐bonnet gasketed joint by either rocking the bonnet or prying between the
bonnet and valve body. Work the prying tool around the bonnet until the bonnet loosens. If no fluid leaks from the
joint, remove the nuts completely and carefully lift the bonnet.
5. Remove the locknut from the valve stem and separate the valve plug and stem assembly from the bonnet. Set the
parts on a protective surface to prevent damage to gasket or seating surfaces.
6. Remove the bonnet gasket (key 11) and cover the opening in the valve to protect the gasket surface and prevent
foreign material from getting into the valve body cavity.
CAUTION
To prevent possible product damage, cover the opening in the valve in the following procedure to prevent foreign material
from getting into the valve body cavity.
7. Remove the packing flange nuts (key 5), packing flange (key 37), upper wiper (key 12, figure 2), and packing
follower (key 13, figure 2). Carefully push out all the remaining packing parts from the valve side of the bonnet
using a rounded rod or other tool that will not scratch the packing box wall. Clean the packing box and the metal
packing parts.
8. Inspect the valve stem threads and packing box surfaces for any sharp edges that might cut the packing. Scratches
or burrs could cause packing box leakage or damage to the new packing. If the surface condition cannot be
improved by light sanding, replace the damaged parts by following the appropriate steps in the Trim Maintenance
section.
9. Remove the cover protecting the valve body cavity.
10. Install a new bonnet gasket (key 11), making sure the gasket seating surfaces are clean and smooth. Place the valve
plug and stem assembly into the valve body, making sure it is properly centered on the seat ring (key 9). Also make
sure the valve plug (key 2A) sealing parts are evenly engaged by the chamfer in the top inside diameter of the cage
(key 3) to avoid damaging the parts. Then slide the bonnet over the valve stem (key 2B) and onto the studs (key 15).
Note
Proper performance of the bolting procedures in step 11 compresses the bonnet and cage gaskets (key 11) enough to seal the
body-to-bonnet joint.
The proper bolting procedures in step 11 include--but are not limited to--ensuring that bolting threads are clean and evenly
tightening the hex nuts onto the studs in a crisscross pattern. Tightening one nut may loosen an adjacent nut. Repeat the
crisscross tightening pattern several times until each nut is tight and the body-to-bonnet seal is made.
Studs and hex nuts should be installed such that the manufacturer’s trademark and material grade marking is visible, allowing easy
comparison to the materials selected and documented in the Emerson/Fisher serial card provided with this product.
WARNING
Personal injury or damage to equipment could occur if improper stud and nut materials or parts are used. Do not operate or
assemble this product with stud(s) and nut(s) that are not approved by Emerson/Fisher engineering and/or listed on the
serial card provided with this product. Use of unapproved materials and parts could lead to stresses exceeding the design
or code limits intended for this particular service. Install studs with the material grade and manufacturer's identification
mark visible. Contact your
Emerson sales office
or Local Business Partner if a discrepancy between actual parts and
approved parts is suspected.
