HEROSE 01322 Instrucciones De Servicio página 30

Operating instructions
7.3 Maintenance instruction – packing gland nut
In accordance with DIN EN 1626 the leakage rate must be less than 14 mm³/p. (in the case of combustible
fluids less than 10 mm³/p.). To achieve and maintain a lower leakage rate of 0.1 mm³/s, it is recommended
to tighten the packing glands of HEROSE valves after 50 cycles following installation to the torque corre-
sponding to the table using a torque wrench.
Torque
Valve
nominal size
DN15
DN20
DN25
DN32
DN40
DN50
7.4 Fault table
Fault
Leak at the stem
Leak between cover
and body
Leak in the seating
Body leaking
Valve does not open /
close
26
Torque
RG (gunmetal)
SS (stainless steel
13 Nm 13 Nm
13 Nm 13 Nm
13 Nm 13 Nm
13 Nm 13 Nm
13 Nm 13 Nm
13 Nm 13 Nm
Cause
Gland nut loose
Packing gland defective
Fit on the stem damaged
Bonnet loose
Seal damaged
Foreign body between cone
and seating
Seating damaged
Cone seal damaged
Discontinuity/gas cavity open
Gland nut overtightened
Thread seized
Actuator not working
Phone +49 4531 509-0
)
Remedy
 Retighten the gland nut
 Replace the packing gland
 Replace the stem
 Tighten the bolts to the specified torque
 Replace seal
 Remove foreign body / flush the system
 Replace the body
 Replace the cone
 Replace the body
 Loosen the gland nut
 Tightness must still be ensured
 Replace bonnet
 Check energy supply to the actuator
 Check limit switches