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ANDERSON GREENWOOD 4142HF PRESSURE RELIEF VALVE
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
1 SAFETY PRECAUTIONS
Read and understand this instruction manual
before installing, operating or performing
maintenance on the Anderson Greenwood
4142HF Pressure Relief Valve (PRV) following
all precautions and warnings noted herein.
NOTE
This manual is issued for guidance only and does
not affect our standard terms and conditions and
our Product Limited Warranty, all of which are
available on request.
WARNING
The relief valve must be isolated from tank
pressure before servicing. All gas/vapour must
be blocked and pressure safely vented. Wear
appropriate protective clothing and breathing
apparatus if hazardous gas/vapours are present.
Use appropriate lifting equipment where required.
2 GENERAL DESCRIPTION
The Anderson Greenwood 4142HF PRV is
employed in gas/vapour service applications
for low pressure storage tanks, vessels or
applications requiring low pressure protection
with high capacity flow requirements. This
product helps to prevent damage to the tank
and also prevents the tank's contents from
escaping, ensuring the safety of personnel and
the surrounding environment.
Pressure relief valves are designed to limit the
maximum pressure that can exist in a tank due
to inflow of the tank contents or due to changes
in temperature as a result of environmental
conditions.
• For ease of maintenance, both pressure and
vacuum seats are removable.
• Polytetrafluoroethylene (PTFE) coated
internals are supplied as an all-weather
option.
3 OPERATION
The Anderson Greenwood 4142HF PRV is a
direct acting vent valve based on the weight of
the pallet to keep the valve closed. When tank
pressure acting on the seat sealing area equals
the opposing force acting on the pallet, the
valve is on the threshold of opening. Any further
increase in pressure will cause the pressure
pallet to lift allowing the contents of the tank to
vent through the valve (out-breathing).
In order for the valve to open and achieve its
design lift, an overpressure will be required.
The 4142HF PRV has been designed to achieve
this design lift and rated capacity within 10%
overpressure. Since the weight on the pallet
determines the set pressure of the valve, the
settings are changed by varying the weight on
the pallet.
2
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