Viking Pump TSM680: 895, 893 and 897 Mag Drive - Manual (Page 15)

SECTION TSM 680 ISSUE G PAGE 15 OF 17
FIGURE 41
PRESSURE RELIEF
VALVE INSTRUCTIONS
DANGER !
before opening any Viking pump liquid cham-
ber (pumping chamber, reservoir, relief valve
adjusting cap fitting etc.) be sure:
1. That any pressure in the chamber has been
completely vented through the suction or
discharge lines or other appropriate openings
or connections.
2. That the driving means (motor, turbine,
engine, etc.) Has been “locked out” or made
non- operational so that it cannot be started
while work is being done on pump.
3. That you know what liquid the pump has been
handling and the precautions necessary to
safely handle the liquid. Obtain a material
safety data sheet (MSDS) for the liquid to be
sure these precautions are understood.
Failure to follow above listed precautionary
measures may result in serious injury or death.
VALVE – GG, HJ AND HL SIZES
FIGURE 43
VALVE - LIST OF PARTS
1. Valve Cap 6. Valve Body
2. Adjusting Screw 7. Valve Spring
3. Lock Nut 8. Poppet
4. Spring Guide 9. Cap Gasket
5. Bonnet
DISASSEMbLY – RELIEF VALVE
Mark the valve and head before disassembly to insure proper
reassembly.
1. Remove the valve cap.
2. Measure and record the length of extension of the
adjusting screw. Refer to “A” on Figures 43 and 44.
3. Loosen the locknut and back out the adjusting screw
until spring pressure is released.
4. Remove the bonnet, spring guide, spring and poppet
from the valve body. Clean and inspect all parts for wear
or damage and replace as necessary.
ASSEMbLY – RELIEF VALVE
Reverse the procedures outlined under DISASSEMbLY –
RELIEF VALVE. If the valve is removed for repairs, be sure
to replace in the original position. The relief valve adjusting
screw cap must always point towards the suction side of
the pump. If the pump rotation is reversed, remove the relief
valve and turn end for end. Refer to Figure 4, page 3.