19
Crosby
STylE JOS-E, JBS-E, JlT*-JBS-E, JlT*-JOS-E ValVES
InstallatIon and MaIntenance InstructIons
6.8 assembly of cap and lifting lever devices
Styles JOS-E, JBS-E and JlT-E pressure relief
valves are furnished with several different
caps and lifting lever devices� The following
describes assembly of the available types of
cap construction�
(Disassembly is the reverse of assembly)�
For part identification refer to Figure 14�
• Type A and J
Install the cap gasket and screw the cap onto
the top of the bonnet� Tighten the cap with a
strap wrench�
• Type B and K
Install the cap gasket and screw the cap onto
the top of the bonnet� Tighten the cap with
a strap wrench� Install the cap plug gasket
and screw cap plug into the cap� The test rod
is installed only during system hydrostatic
testing� Never install the test rod unless
performing system hydrostatic testing�
• Type C
Screw the spindle nut onto the spindle�
Place the cap on the bonnet� Install the forked
lever and forked lever pin� attach the lever to
the cap using the lever pin and secure with
the lever pin cotter�
adjust the spindle nut until the forked lever
rests on the lever and there is a
1
/
16
inch
minimum of play between the forked lever
and the spindle nut� The spindle nut may be
adjusted by removing the forked lever pin,
forked lever and cap� When the spindle nut is
in proper adjustment, install the spindle nut
cotter pin� Replace the cap and forked lever
and install the forked lever pin and forked
lever pin cotter�
Position the lever opposite the valve outlet
and install the four (4) cap set screws and
tighten them against the groove in the top of
the bonnet�
6.9 soft seat construction
Coat O-ring with 'Parker Super O-lube'
and place a small amount of loctite 242
(or equivalent removable thread lock) onto
retainer screw before assembly� Tighten
retainer screw(s) securely�
• O-ring soft seats
Crosby Style JOS-E/JBS-E metal-to-metal
seated pressure relief valves may be
converted to an O-ring soft seat by replacing
the standard disc insert and nozzle with those
parts designed to house the O-ring soft seat
or vice versa�
• Type D
Install the cap gasket on the bonnet� Screw
the spindle nut onto the spindle� Place the
dog in the cap and install the dog shaft so
that the dog is horizontal and the square
on the end of the dog shaft has a corner on
top� With the dog shaft in the position above,
scribe a horizontal line on the end of the dog
shaft� This line must be horizontal when the
lifting gear is finally installed on the valve�
Install the dog shaft O-ring in the dog shaft
bearing and place the dog shaft bearing
gasket on the dog shaft bearing�
Screw the dog shaft bearing into the cap�
Rotate the dog shaft so that the dog is
pointing down and install the cap assembly
onto the bonnet� Rotate the dog shaft so that
the dog contacts the spindle nut� With the
scribed line horizontal, remove the assembly
and adjust the position of the spindle nut�
Repeat the operation until the scribed line is
horizontal when the dog contacts the spindle�
Remove the assembly and install the spindle
nut cotter pin�
Install the lifting gear assembly onto the
bonnet and secure it with cap studs and nuts�
For Type D lifting levers that have two part
caps (cap and cap top) the above procedure
is accomplished more easily� after the cap is
screwed to the bonnet, the positioning of the
dog shaft is the same as above except that the
positioning of the spindle nut is performed
last through the open end of the cap�
With the dog in the horizontal position,
screw the spindle nut onto the spindle until
it contacts the dog� Install the spindle nut
cotter, cap top gasket and screw the cap top
into the cap�
• Type E
assembly of Type E lifting lever is identical
to Type D with the addition of the cap plug
gasket and cap plug� The test rod is installed
only during system hydrostatic testing�
Never install the test rod unless performing
system hydrostatic test�
• Type G and L
Install the cap studs to the bonnet top�
Place the cap gasket onto the bonnet and the
cap onto the cap studs� Install and tighten cap
stud nuts�
• Type H and M
assembly of Type H and M is identical to
Type g and l with the addition of the cap plug
gasket and cap plug� The test rod is installed
only during system hydrostatic testing� Never
install the test rod unless performing system
hydrostatic test�
