4
Crosby
STylE JOS-E, JBS-E, JlT*-JBS-E, JlT*-JOS-E ValVES
InstallatIon and MaIntenance InstructIons
2 sTorage and handling
Valves are often on hand at the job site months
before they are installed� unless stored
properly and protected, valve performance may
be affected adversely�
Rough handling and dirt may damage or
cause misalignment of the valve parts� It is
recommended that the valves be left in their
original shipping containers and that they be
stored in a warehouse or at a minimum on a
dry surface with a protective covering until they
are used�
3 insTallaTion
3.1 Care in handling
Pressure relief valves must be handled
carefully and never subjected to sharp impact
loads� They should not be struck, bumped
or dropped� Rough handling may alter the
pressure setting, deform valve parts and
affect seat tightness and valve performance
adversely�
When it is necessary to use a hoist, the chain
or sling should be placed around the valve body
and bonnet in a manner that will ensure that
the valve is in a vertical position to facilitate
installation� The valve should never be lifted or
handled using the lifting lever inlet and outlet
protectors should remain in place until the
valve is ready to be installed on the system�
1 inTroduCTion
Crosby Style JOS-E/JBS-E pressure relief
valves have been selected for installation
because of their performance features,
reliability and ease of maintenance�
adherence to the installation and maintenance
procedures specified herein will provide the
utmost in safety, a minimum of maintenance,
and a long service life� Crosby Style JOS-E,
JBS-E and JlT-E valves are manufactured
in accordance with the requirements of
Section VIII Pressure Vessels, aSME Boiler
and Pressure Vessel Code� Style JOS-E is a
conventional closed bonnet valve� Style JBS-E
has a balanced bellows for minimizing the
effect of back pressure�
Style JlT-E is a high performance valve
designed specifically for liquid service�
The JlT-E features patented contoured liquid
trim in a standard JOS-E/JBS-E envelope�
3.3 inlet piping
Pressure relief valves should be mounted
vertically in an upright position either directly
on a nozzle from the pressure vessel or on a
short connecting fitting that provides direct and
unobstructed flow between the vessel and the
valve� Installing a pressure relief valve in other
than this recommended position might affect
its operation adversely� Where rounded or
beveled approaches cannot be provided ahead
of the valve it is recommended that one size
larger nozzle or fitting be used� a valve should
never be installed on a fitting having a smaller
inside diameter than the inlet connection of the
valve�
Inlet piping (nozzles) must be designed to
withstand the total resultant forces due
to the valve discharging at the maximum
accumulated pressure and the expected piping
loads� The magnitudes of the bending moment
exerted on the inlet piping will depend on the
configuration and method of supporting the
outlet piping�
Many valves are damaged when first placed
in service because of failure to clean the
connections properly when installed� Both
the valve inlet and the vessel and/or line on
which the valve is mounted must be cleaned
thoroughly of all foreign material� The inlet
connection bolts or studs should be drawn
down evenly to avoid straining the valve body
with possible distortion of the nozzle flange or
base�
3.2 inspection
Pressure relief valves should be inspected
visually before they are installed to ensure that
no damage has occurred during shipment or
while in storage�
all protective material, sealing plugs and any
extraneous material inside the valve body or
nozzle must be removed�
The valve nameplate and other identifying tags
should be checked to ensure that the particular
valve is being installed at the location for which
it was intended�
The valve seals protecting the spring setting
and ring adjustments should be intact� If seals
are not intact, the valve should be inspected,
tested and seals installed properly before use�