TCS 700-30, Инструкция по установке, эксплуатации и обслуживанию

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Page 49
Preset Valve Trouble Shooting
PROBLEM: The valve will not close completely.
A) The shaft of the piston may be bent from excessive force.
B) Debris may be between the piston and piston guide.
C) The upper or lower seals may be worn, swollen from incompatibility or cut from debris.
D) The mechanical linkage to the Veeder Root 7889 preset counter may be tight. The linkage must
be loose for the preset to operate correctly.
E) The Veeder Root preset may have a worn or bent trip mechanism that is not allowing the preset to
function.
PROBLEM: The valve shuts immediately upon first stage trip, bypassing the second stage
closure.
A) The mechanical linkage might need to be adjusted, moving the Nylon locking nuts forward or
backwards to change the closing of the preset valve.
B) The Veeder Root preset may need to be “raked” or adjusted for the correct shut-off volume. See
Veeder Root 7889 preset service manual for further instructions.
C) The Veeder Root preset may have a worn or bent trip mechanism that is not allowing the preset to
function.
PROBLEM: The preset batch over or under registers correct volume.
A) The mechanical linkage might need to be adjusted, moving the Nylon locking nuts forward or
backwards to change the closing of the preset valve.
B) The Veeder Root preset may need to be “raked” or adjusted for the correct shut-off volume. See
Veeder Root 7889 preset service manual for further instructions.
C) The Veeder Root preset may have a worn or bent trip mechanism that is not allowing the preset to
function.
760 Air/Vapor Check Valve Trouble Shooting
PROBLEM: Product will not be pumped through the meter.
Pressure has increased behind the air check piston and will not open the valve. Make sure the NOTCH
for the minimum bleed on the valve plate is in the top position to ensure the release of pressure.