Instruction Manual

Instruction Manual
D103803X012
Z500 Valve
April 2015 - rev B
7
Procedure
Initial Preparation
1. Ensure the valve is in the fully open position so that vital sealing areas of the ball are not exposed to weld spatter.
2. Never make arc strikes on the valve body or end adapter except inside the groove intended for butt welding or
inside the corner of the joint for socket welding. Arc strikes made on areas which are not intended to be welded can
cause a localized increase in hardness and micro-cracks, and can otherwise compromise the intended mechanical
properties of the material.
3. Attach the welding ground strap to the side of the valve being welded.
4. Install the valve into the piping system prior to welding in order to minimize piping loads. Orient the valve with the
stem vertical, if possible, and install the piping such that pipe loads are minimized on the valve.
5. Weld the valve into the line using welders and procedures fully qualified per ASME Boiler and Pressure Vessel Code
Section IX.
6. Ensure that the valve body temperature always remains below 427_C (800_F).
Post-Weld Heat Treatment
CAUTION
Depending on valve body materials used, post weld heat treating may be required. If so, damage to internal parts is
possible. Do not place the entire valve in a stress relief furnace, or cover the entire valve with stress relieving blankets, as
this could damage the valve. Contact your Emerson Process Management sales office
for additional information.
1. Weld the valve into the line using qualified welders and procedures per Section IX of the ASME Boiler and Pressure
Vessel Code. If specific procedures are required, contact your Emerson Process Management sales office
for written
guidance based on pipe and valve materials.
2. Apply post weld heat treat in accordance with valve material and code requirements. Only local post weld heat treat
on each end of the valve must be used.
Final Inspection after Post-Weld Heat Treatment
After post weld heat treat, verify valve body studs and packing studs are tight.
CAUTION
Before cycling the valve in the line, make sure the line is clean of weld slag and other debris that could damage the valve.
Cycle the valve after installation to ensure proper functioning.
1. Cycle the valve to verify proper operation. Ensure that the torque required to cycle the valve has remained within
acceptable limits.
2. Verify that the body and packing bolting are tightened to the correct torque per tables 4 and 5.
3. Install proper insulation as required for insulated piping systems.
Operation
1. No routine maintenance or lubrication is required. No tightening of body studs should be necessary. Packing
bolting may be retightened if a stem packing leak is noted during operation.