KUNKLE VALVE
PRESSURE RELIEF VALVES
INSTALLATION AND OPERATING INSTRUCTIONS
INSTALLATION
Always wear proper safety equipment,
including safety glasses and ear protection.
1. Mount the valve in a vertical position so
that the valve body is self-draining. If a
body drain port is provided, make sure it
is open when required by the ASME code.
HANDLING
This pressure relief valve is designed to protect
equipment from overpressure. The valve
should be handled with care, not subjected to
heavy shock loads and protected to prevent
contamination from getting inside. It should
be installed correctly per ASME boiler and
pressure vessel code requirements, where
applicable. Failure to do so could result in
property damage or serious injury to personnel.
When hoisting the valve into position for
installation, care should be exercised so that
lifting straps do not contact the valve lift lever.
Rev. E 05/24/2007
Emerson.com/FinalControl
© 2017 Emerson. All Rights Reserved.
VCIOM-01873-EN 17/07
3. For threaded valves, to prevent sealing
compound from entering and damaging the
valve, apply a small amount of pipe thread
sealing compound to external threads only.
Do not put any sealing compound on the
first thread or on any internal threads. To
do so may cause the sealing compound to
enter the valve and cause seat leakage.
Do not use the valve body or bonnet for
installing the valve in threaded connections.
Use the wrench flats provided to tighten
the valve to the connecting pipe. Torque the
valve enough to ensure a pressure-tight
seal and do not overtighten. To do so may
cause valve leakage.
4. For flanged valves, use new gaskets and
tighten the mounting studs evenly.
5. Do not paint, lubricate or allow
contaminates to enter or cover the interior
or any working parts of the valve.
6. Remove gag screw (if valve is so equipped)
before system start up.
Do not plug any bonnet vent openings. The
inlet piping should be as short as possible,
with no elbows and equal to or greater
than the size of the pressure relief valve
inlet connection. This will help to limit the
inlet pressure drop to 3% or less when the
valve is relieving.
2. When discharge piping is connected to the
valve outlet, make sure it is self-draining if a
body drain port is not used. The valve should
not be connected to any discharge pipe that
contains pressure before the valve opens or
to any pipe where the pressure build-up is
greater than 10% of the set pressure when
the valve is open and relieving.
Discharge piping, other than a short tailpipe,
must be supported. For steam service,
a drip pan elbow or flexible connection
between the valve and the pipe should be
used to prevent excessive pipe stress, due
to thermal expansion, from being imposed
on the valve body.
PRE-INSTALLATION
Verification of model and service media/capacity/
temperature/pressure limits
Verify the model number on the tag against
the model number of the order. For European
service, verify the 'CE Mark' tag is connected
to the valve. Verify the service media, capacity,
temperature and pressure limits of the valve
against the application. Please note the marked
capacity is based on standard temperature
and pressure conditions and is valid only for
the service media noted on the catalog order
guide. Adjustments to the capacity must be
performed for different temperatures or service
media and are the responsibility of the end user
to determine.
Before installation these instructions must be read fully and understood
