Flowserve BX 150 - Manual (Page 2)

37-2
TABLE I:
Flange Bolting Torques* (Class 150)
Torque Values
(ft-lbs) (newton-meter)
2, 3, 4 118 160
6, 8 209 282
10, 12 337 455
* For intermediate strength bolting, per ASME/ANSI B16.5 – 1988.
Quick-check
Prior to start-up, check the control valve by following
these steps.
1. Check for full stroke by making the appropriate in-
strument signal change. Observe the disc position
indicator plate mounted on the actuator transfer
case cover plate. The disc should change position
in a smooth, rotary fashion.
2. Check all air connections for leaks. Tighten or re-
place any leaking lines.
3. Evenly tighten the packing nuts on the valve to fin-
ger tight plus 1 /
2
to one full turn (Teflon only).
CAUTION: Do not overtighten packing. This can
cause excessive packing wear and high shaft
friction, which may impede shaft rotation.
After the valve has been in operation for a short time,
check the packing nuts to make sure they are just
over finger-tight (readjust if necessary). If packing
box leaking occurs, tighten the packing nuts only
enough to stop leakage.
4. To observe the valve failure mode in case of air fail-
ure, position the valve to mid-stroke and shut off the
air supply or disconnect the instrument signal. By
observing the indicator plate, the disc should either
fail open or closed. If incorrect, refer to the “Revers-
ing the Actuator” section in the appropriate Actuator
Maintenance Instructions.
PREVENTIVE MAINTENANCE
At least once every six months, check for proper opera-
tion by following the preventative maintenance steps
outlined below. These steps can be performed while the
valve is in line and, in some cases, without interrupting
service. If an internal problem is suspected, refer to the
“Disassembly and Reassembly” section.
1. Look for signs of gasket leakage through the body
and line flanges. Tighten flange bolting if necessary.
2. Note if any corrosive fumes or process drippings
are damaging the valve.
Valve Size
(inches)
Installation
1. Before installing the valve, clean the line of dirt,
scale, welding chips, and other foreign material.
Clean gasket surfaces thoroughly to insure leak-
proof joints.
2. Check flow direction to be sure valve is installed
correctly. Fail-closed valves should be installed
with the shaft upstream only in gas service. It
is preferred that liquid service valves be installed
with the shaft downstream regardless of air fail-
ure action. However, under certain flow condi-
tions the valve can flow shaft upstream. Consult
the factory if the valve must be mounted with the
shaft upstream in liquid service. Fail-open valves
should be installed with the shaft downstream.
3. Fully close the valve before and during the instal-
lation process.
WARNING: Keep hands, hair, clothing, etc. away
from the rotating disc and the seat when operat-
ing the valve. Failure to do so could cause seri-
ous injury.
WARNING: When valve is installed for end-of-
line service, retainer ring must be supported by
the mating pipe flange.
CAUTION: Because of Valdisk 150’s self-cen-
tering seat, there is no reason to open the
valve at any time during installation. There-
fore, the valve should remain closed until the
valve is fully installed.
4. Connect the air supply and instrument signal.
Throttling valves are usually equipped with valve
positioners. Two connections are marked for the
air supply and for the instrument signal. Both
cylinder and positioner are suitable for 150 psi air
supply. An air regulator is not required unless the
supply pressure exceeds 150 psi. An air filter is
recommended unless the supply air is unusually
clean and dry. All connections must be free of
leaks.
NOTE: In some rare cases, the air supply must
be limited to 80 psi rather than 150 psi. In this
case, a sticker found near the upper air port on the
cylinder will indicate this and an air regulator may
need to be installed to insure the supply pressure
does not exceed 80 psi.
5. Make sure proper clearance exists internally in
the mating piping to permit proper disc rotation.
6. Apply the recommended torque values to the line
flange bolting for proper sealing (see Table 1).