Viking Pump TSM280: Duralobe (Discontinued) - Manual (Page 23)

Page : 21
3.8 Integral Pressure Relief Valves
see Figs 11, 12, 13 and 14.
All models in the Duralobe® series can be supplied with integral pressure
relief valves with both spring and air loaded versions available. The function of
the valves can be further enhanced with the option of manual or airlift override
offering particular benefits where CIP or SIP is employed. Valves
incorporating this option can be opened to regulate the volume of the cleaning
media within the pump chamber thereby avoiding the need for manual
cleaning or external by-pass.
Where the pump is mounted onto a portable cart baseplate complete with
motor and drive to be used as a mobile set, it is strongly recommended that a
integral pressure relief valve is installed.
The Duralobe ® integral pressure relief valves available include:
Spring Loaded - see Fig 11.
Valve can be set to required pressure relief setting.
Spring Loaded with Manual Lift - see Fig 12.
Valve can be set to required pressure relief setting. Manual lift override can
be used to open valve without disturbing pressure relief setting (not
available on the S4 series).
Spring Loaded with Air Lift - see Fig 13.
Valve can be set to required pressure relief setting. Air lift override, which
operates on an air supply of up to 105 psi depending on pressure relief
setting, can be used to open valve without disturbing pressure relief setting
(not available on the S4 series).
Air Loaded with Air Lift - see Fig 14.
Valve, which operates on an air supply of up to 105 psi for S1, S2, S3 and
150 psi for S4, can be set to required pressure relief setting. Air lift override,
which operates on an air supply of up to 105 psi for S1,S2,S3 and 150 psi
for S4, depending on pressure relief setting, can be used to open valve
without disturbing pressure relief setting.
Air actuated relief valves can be operated remotely and interfaced with other
elements of the system or process control.
Integral pressure relief valves are normally used to protect the pump from the
effects of increases in system pressure caused, for example, by a restricted or
closed discharge line. In response to a pressure increase the valve opens
and internally circulates the pumped media within the pump chamber.