5
SEMPELL HIGH PRESSURE FORGED GLOBE VALVES
INSTALLATION AND MAINTENANCE INSTRUCTIONS
TROUBLESHOOTING GUIDE
Symptom Possible cause Solution
Stem packing leaking 1. Gland flange nuts too loose 1. Check the gland flange nuts torque
2. Packing damaged 2. Replace packing
Body-bonnet leaking 1. Gasket bolting loose (Figure 4, pos. 10) 1. Tighten bolting (Figure 4, pos. 10)
2. Gasket damage 2. Replace the gasket
Valve leaking 1. Valve not fully closed 1. Close the valve
2. Debris trapped in valve 2. Cycle and flush (with valve open) to
remove debris
3. Sealing surface damaged 3. Recondition the seat surface
Jerky operation 1. Packing is too tight 1. Loosen gland nuts, cycle the valve,
retighten
Back seat leaking 1. Back seat damage 1. Recondition the back seat surface
IMPORTANT
To ensure tightness of pressure seal gasket,
pull up bolts must be tightened when the valve is
under fully hydrostatic pressure test or twenty-
four hours in operation.
Yearly checking of bolt torque is recommended.
OPERATION AND MAINTENANCE
INSTRUCTIONS
High pressure forged Sempell valves do
not require special care to work properly.
The following instruction will help provide a
satisfactory and long life service.
Cautions
• Ensure to perform periodic valve verification
as described in dedicated paragraph (page 4).
• In case of actuated valves, always follow the
specific instruction given by the actuator’s
manufacturer.
• Never change the setting of torque and/or
limit switches which have been carefully set
during the final test at our workshop.
Operation and maintenance instructions
Please refer to Figure 4
Assembly
1. All the parts must be cleaned. It is
necessary a visual examination to ensure
that there are no foreign parts inside.
2. The internal seat surface (1.3) must be
carefully lapped in order to avoid any defect.
3. The surfaces of the plug seat (28.1) must be
lapped in order to avoid any defect.
4. Assemble the plug (28) with the plug nut (30)
and screw to the stem (20). Insert now this
unit into the body.
5. Insert the bonnet (2) into the body. Take
care that the operator wears gloves in order
to ensure a careful assembly of the pure
graphite gasket (7), covered with stainless
steel inlets.
6. The ring (6) and the four pieces of the
segment ring (5) must be assembled over
the gasket (7). The segment ring has to be
put into the body groove.
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