4
VII. Service:
continuous fluid flow except in emergency situations. If the
valve is subjected to extended flow or abrasive fluids, it may
not reseal completely once the pressure is relieved. If
complete fluid shut-off is desired, a shut-off valve (such as
Weir SPM’s plug valve) should be installed in series with the
relief valve, which can be closed once the over-pressure is
relieved.
There are wear surfaces on this device and elastomer seals
that require maintenance. For the valve to operate properly
and safely, these items must be kept in good condition.
Inspection and servicing should be conducted in
accordance with a recognized program. The more severe
the usage, the more often the maintenance.
In order to determine the Nitrogen gas line pressure, the
valve is equipped with a corrosion resistant bourdon tube
gauge with a pressure rating of 0 to 600 psi. This range is
adequate to allow the valve to reach maximum operational
working pressure, and yet still allow precise adjustments in
line pressure. However, if the relief valve is only operated at
release pressures below 6000 psi, then the pressure gauge
could be replaced with a 0 – 300 psi gauge. This would
increase the accuracy at which the Nitrogen gas line
pressure could be adjusted. The primary consideration is not
to operate the pressure gauge beyond 75% of its rated
capacity for any extended period of time. If additional
information is needed, please contact the Weir SPM
Engineering department.
ALWAYS REMEMBER
1. DISASSEMBLY UNDER PRESSURE CAN CAUSE
SERIOUS INJURY OR DEATH.
2. Always use a new parts kit for reassembly.
3. Clean all components thoroughly prior to reassembly
using protective clothing and safety glasses.
4. Check sealing surface area of wear sleeve and nozzle for
pitting, erosion or other flaws. Failure in sealing can
result if these areas are not smooth.
5. Use only Weir SPM relief valve parts on Weir SPM relief
valves.
6. This device is intended to discharge to atmospheric
pressure when it relieves. It should not be subjected
to any significant back pressure.
7. Never block the valve discharge line. It will cause valve
damage.
Observe all instructions, cautions and warnings as
noted in this brochure. Failure to do so can lead to
equipment damage, personal injury or loss of life.
TOOLS REQUIRED
1. Vise
2. Special Torque Tool (See Fig. 6)
3. ½” Hex Socket Wrench & ¼” Hex Socket Wrench
4. Screwdriver
5. 2 lb. Hammer
6. Ø ½” BAR x 12” LG (Aluminum or Brass)
7. 600 Grit Sandpaper
8. Anti-seize Lubrication
9. Hand and Eye Protection
DISASSEMBLY: (Fig. 4 & 5)
MAKE SURE THAT THERE IS NO PRESSURE ON THE
VALVE
1. If the nitrogen cylinder 2 is attached, close the high-
pressure cylinder valve 20 . Then bleed down and
remove the nitrogen line 19 (and vent line from Figure
2, if so equipped) from the unloading valve 1 (Fig. 4).
2. Secure the valve in a horizontal position by clamping the
valve body 2 in a vise (Fig. 5).
3. Remove the eight lower and ten upper 5/8" socket
screws 32 from the flange 1 . Separate the cylinder 3
from the flange 1 by using jackscrews. Separate the
flange 1 from the body 2 by using jackscrews.
Remove the entire bonnet assembly from the body.
4. Remove the two 1-1/4" hex jam nuts 23 from the
cylinder rod 4 . Hold the cylinder rod 4 by the flats at
its mid length. Exercise care to not damage the rod's
other surfaces. The jam nuts 23 are installed with blue
style thread lock. The piston 8 and sleeve 11 can now
be removed from the cylinder rod 4 .
5. Cut the stainless safety wire from the 1/4" socket
screws 30 that hold the rod cap 9 to the cylinder
rod 4 . Remove the wear sleeve 14 from the cylinder
rod.
6. Remove the spider 12 from the valve body 2 .
Remove the cartridge 10 along with the main seal
assembly 5 from the body.
7. Gently remove the main seal assembly 5 from the
cartridge 10 .
Inspecting Components: (Fig. 5)
1.) Body 2 :
Visually inspect the o-ring groove area beneath the
cartridge 14 . This is a critical area. If the groove shows
indications of damage from either erosion or corrosion, the
body should be replaced. It is not repairable.
Visually inspect the fluid discharge surface for erosion or
corrosion. Some wear in this area is expected. Any damage
to this surface that extends deeper than .10" renders the
part unusable and it should be replaced.
Visually inspect the flange 1 seal surface for erosion or
corrosion. Damage to this area will allow fluid to leak past
the flange during the unloading function. If this surface
shows signs of damage, the body should be replaced.
2.) Cylinder 3 :
Visually inspect the inside surface of the cylinder for wear or
damage. Damage to this surface renders this component
unusable and should be replaced.
3.) Piston 8 & Sleeve 11 :
Visually inspect the piston and sleeve seal areas 25 28 31
for damage or wear. If damage or wear is evident, the part
should be replaced.
4.) Check Valve 13 :
Blow through the hex end of the check valve mounted in
the piston 8 . It should pass air with little breath. Check
the threaded end in the same manner. It should not pass
breath. If the check valve leaks in the checked direction, it
should be replaced.
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