Kelso JS75 Instruction Manual

Installation, Operation,
Inspection and Maintenance
Manual
PRESSURE RELIEF VALVE MODELS:
JS75 & JS75S
JS75XH & JS75XHS
JS75XL & JS75XLS
JS75H & JS75HS
JS75L & JS75LS
JS75LT & JS75LTS
JS165H & JS165HS
JS165L & JS165LS
JS165LT & JS165LTS

1
JS PRESSURE RELIEF VALVES
© 2017 Kelso Technologies (USA) Inc. All Kelso Valves are Patent Protected. Detailed designs are subject to change without notice.
Kelso Technologies Inc. 1526 Texas Ave, Bonham, TX. 75418, Phone: [phone]
Document No. - KTUD112
Revision 6 –2/7/2022 (Original Release 12/7/2015)
www.kelsotech.com
Printed in U.S.A.

2
JS PRESSURE RELIEF VALVES
© 2017 Kelso Technologies (USA) Inc. All Kelso Valves are Patent Protected. Detailed designs are subject to change without notice.
Kelso Technologies Inc. 1526 Texas Ave, Bonham, TX. 75418, Phone: [phone]
Document No. - KTUD112
Revision 6 –2/7/2022 (Original Release 12/7/2015)
www.kelsotech.com
Printed in U.S.A.
1.0 Introduction
The Kelso external pressure relief valve raises the bar on best available and safest
technology for the railroad transportation industry. With thousands of units in service,
our PRV has demonstrated reliable, safe, and effective with limited maintenance and
repair.
1.1 Precautions
The JS Series Pressure Relief Valves (PRVs) can be used as a safety device in
the storage and transportation of a wide variety of fluids; many of which are
hazardous materials and could cause serious injury or damage. Only personnel
which are properly qualified should install, repair, or rebuild the JS Series PRV’s.
Only certified parts from Kelso or one of its authorized representatives should be
used in the JS Series PRV’s. The JS Series PRV’s may be installed on DOT tank
cars that carry hazardous chemicals and may travel under pressure.
Read these instructions prior to performing periodic maintenance or
repairs.
1.2 Regulations
Kelso valves are used in contact with a variety of products; many of which are
hazardous. The acceptance and transportation of products are regulated by DOT
and AAR in the U.S.A and in Canada by CTC and Transport Canada.
Regulations of other governmental bodies must be complied with. All personnel
should be familiar with and follow these regulations. Nothing in these instructions
is intended to conflict with or supersede these regulations.
NOTE: Specifications are subject to change without notice.
1.3 Technical Specifications
8 Bolt PRV:
Valve
Model
Set
Pressure
(psig)*
Flow Rate
(SCFM-Air)
Orifice
Diameter
(in.)
Flow Area
(Sq.
Inches)
Weight
(lbs.)
Flange
Thickness
(in.)
JS75/S
75
20,571 @ 85 PSI
3.875
11.79
59
.94
JS75H/HS
75
25,635 @ 85 PSI
4.375
15.0
68
.94
JS165H/HS
165
28,213 @ 182 PSI
3.25
8.3
70
1.13
JS75XH/XHS
75
30,061 @ 85 PSI
4.835
18.31
71
1.13
*Start to Discharge Pressure Figure 1.3.1.

3
JS PRESSURE RELIEF VALVES
© 2017 Kelso Technologies (USA) Inc. All Kelso Valves are Patent Protected. Detailed designs are subject to change without notice.
Kelso Technologies Inc. 1526 Texas Ave, Bonham, TX. 75418, Phone: [phone]
Document No. - KTUD112
Revision 6 –2/7/2022 (Original Release 12/7/2015)
www.kelsotech.com
Printed in U.S.A.
Figure 1.3.2

4
JS PRESSURE RELIEF VALVES
© 2017 Kelso Technologies (USA) Inc. All Kelso Valves are Patent Protected. Detailed designs are subject to change without notice.
Kelso Technologies Inc. 1526 Texas Ave, Bonham, TX. 75418, Phone: [phone]
Document No. - KTUD112
Revision 6 –2/7/2022 (Original Release 12/7/2015)
www.kelsotech.com
Printed in U.S.A.
Item No.
Qty.
Description
1
1
Flange Assembly
2
1
Seal Disc
3
1
Seal
4
1
Seal Retainer
5
1
Spring Block Assembly with Springs*
6
1
Adjustment Screw Assembly
7
1
1-1/4 –7 Hex Jam Nut
8
4
3/8 –16 x 5” Hex Head Bolt
9
4
3/8 –16 Nylon Insert Lock Nut
10
1
10” Dome Cover
11
4
3/8 –16 x 1” Hex Head Bolt
12
1
Thrust Washer
13
1
Needle Bearing
14
1
Thrust Washer
15
1
Nameplate (Not Shown)
16
2
Nameplate Screw (Not Shown)
17
4
3/8” Split Lock Washer
Figure 1.3.3
*The number of spring laminations can vary, replace with like assemblies.
The needle bearing assembly (if applicable) is rated for up to 450° F. The limiting
factors of Kelso’s Technologies PRV are the seal and spring drum.
4 or 3 Bolt PRV:
Valve Model
Set
Pressure
(psig)*
Flow Rate
(SCFM-Air)
Orifice
Diameter
(in.)
Flow Area
(Sq. Inches)
Weight
(lbs.)
Flange
Thickness
(in.)
JS75L/LS
75
1681 @ 85 psi
1.13
1
21
.75
JS165L/LS
165
3445 @ 182 psi
1.13
1
22
.75
JS75XL/XLS
165
4089 @ 85 psi
2.05
3.32
18
.75
JS75LT/LTS
75
1681 @ 85 psi
1.13
1
18
.88
JS165LT/LTS
165
3445 @ 182 psi
1.13
1
18
.88

5
JS PRESSURE RELIEF VALVES
© 2017 Kelso Technologies (USA) Inc. All Kelso Valves are Patent Protected. Detailed designs are subject to change without notice.
Kelso Technologies Inc. 1526 Texas Ave, Bonham, TX. 75418, Phone: [phone]
Document No. - KTUD112
Revision 6 –2/7/2022 (Original Release 12/7/2015)
www.kelsotech.com
Printed in U.S.A.
Figure 1.3.7

6
JS PRESSURE RELIEF VALVES
© 2017 Kelso Technologies (USA) Inc. All Kelso Valves are Patent Protected. Detailed designs are subject to change without notice.
Kelso Technologies Inc. 1526 Texas Ave, Bonham, TX. 75418, Phone: [phone]
Document No. - KTUD112
Revision 6 –2/7/2022 (Original Release 12/7/2015)
www.kelsotech.com
Printed in U.S.A.
Item No.
Qty.
Description
1
1
Flange Assembly
2
1
Sealing Disc
3
1
Seal
4
1
Seal Retainer Plate
5
1
Spring Block Assembly
6
4
Spring
7
4
Spring Drum
8
1
Adjustment Screw Assembly
9
1
5/8 –11 Hex Jam Nut
10
4
1/4 –20 x 2” Hex Cap Screw
11
8
1/4 –20 Nylon Insert Lock Nut
12
1
6” Dome Cover
13
4
Hex Bolt 5/16 - 18 x 3/4” Zinc Grade 5
14
1
1/4 –20 x 1/2” Hex Cap Screw
15
1
Nameplate (Not Shown)
16
2
Nameplate Screw (Not Shown)
17
4
5/16” Split Lock Washer
Figure 1.3.8
*The number of spring laminations can vary, replace with like assemblies.
1.4 Required Tools
Sockets/Wrenches ---
7/16, 1/2, 9/16, 13/16, 15/16, 1 5/8, 1 7/8
Cutting Pliers
Lint Free Cloth
Ratchet
400 Grit Alum. Oxide Emery Cloth
Screwdriver
Thread Locker
Torque Wrench
Anti-Seize
Wire Brush
Adjustable Wrench
2.0 Valve Installation
Only companies and their personnel which are certified by the Association of
American Railroads shall perform maintenance and testing of Kelso pressure
relief valves, pursuant to either M1002 or M1003.
2.1 Preliminary Considerations
New valves are tested, adjusted, and sealed at Kelso. If a new valve has been
left in its original packaging, it is undamaged, and it is not more than six months
old, it may be installed on a tank car without retesting or recalibration. If the
valve has exceeded six months, it must be returned for retesting and
recalibration. Prior to installation, ensure that the valve remains clean and that
the gasket sealing surfaces are not damaged in any way, shape, or form.

7
JS PRESSURE RELIEF VALVES
© 2017 Kelso Technologies (USA) Inc. All Kelso Valves are Patent Protected. Detailed designs are subject to change without notice.
Kelso Technologies Inc. 1526 Texas Ave, Bonham, TX. 75418, Phone: [phone]
Document No. - KTUD112
Revision 6 –2/7/2022 (Original Release 12/7/2015)
www.kelsotech.com
Printed in U.S.A.
2.2 Procedure
1. Prior to removing any valve or fitting from a tank, ensure that the internal
pressure is at atmospheric and that personnel exposure to hazardous
chemicals is eliminated.
2. When the securement bolts have been removed from the mounting flange,
remove the valve, and discard the old flange gasket.
3. The flange mating surface should be free from gouges, scrapes, and
excessive corrosion. If the valve has a flat mating surface, clean the mating
surface using a wire brush if scale, rust, adhesive, or dirt are evident. With
a tongue and groove mating surface, ensure that while removing the old
gasket no damage is done to the bottom of the groove. Any burrs that exist,
radial gouges and debris should be removed.
4. A new pressure relief valve should be kept in its original packaging to
prevent damage to the valve or its components.
5. A test certificate should be available to verify the test date of the valve, if
the last known test date was within six months, the valve can be installed
without retesting or requalifying.
6. Place a new gasket on the tank mounting flange. Kelso Technologies does
not supply the flange gasket, refer to your company’s internal
documentation/procedures for the correct gasket type and material. Gasket
material should be compatible with the chemical being shipped. Inspect the
valve mating flange for defects as described in Paragraph 3 above. Install
the valve on the mounting flange and secure using bolts. The bolts should
be tightened to a prescribed torque of 100-to-180-foot pounds, depending
on the gasket being used. Our suggested value is only to be used in the
event your company does not have a procedure for this.
7. Once the pressure relief valve has been secured to the car, a suitable leak
test should be performed to ensure the flange mating surfaces are pressure
tight.
2.3 Leak Inspection
All newly installed valves must be tested under pressure to confirm that no leaks
are present.
WARNING: Loose nuts, improper tongue seating in the flange, damaged and
wrong size gaskets can result in leaks at the valve mating surfaces.
2.4 Valve Operation
Operation of all valves must conform to all applicable TC, AAR, DOT, and other
governmental bodies.
Kelso valves are spring loaded by a constant force set of springs and there are
no provisions for manual activation. Valves are activated over pressurization,
even on the rail tank car.

8
JS PRESSURE RELIEF VALVES
© 2017 Kelso Technologies (USA) Inc. All Kelso Valves are Patent Protected. Detailed designs are subject to change without notice.
Kelso Technologies Inc. 1526 Texas Ave, Bonham, TX. 75418, Phone: [phone]
Document No. - KTUD112
Revision 6 –2/7/2022 (Original Release 12/7/2015)
www.kelsotech.com
Printed in U.S.A.
3.0 Disassembly
Prior to any servicing of a Kelso Valve, ensure all participating personnel have adequate
personal protective equipment.
3.1 Procedure
1. Remove the dome cover securement bolts. All bolts should have a locking
means (a split lock washer and Loctite). Lift the cover off, invert the cover and
utilize as a container for the remainder of the valve parts (Figure 3.1).
2. If equipped, remove the debris\bee screen. Screens are installed on the
valve to prevent foreign material from entering the valve. A single pin
secures the screen to the valve and can be removed by hand (Figure 3.2).
3. Loosen and remove the lock nut from the adjustment screw.
4. Rotate the adjustment screw counterclockwise, lowering the spring block.
This will relieve the tension on the springs. Rotate the adjustment screw until
the spring pressure is completely relieved (Figure 3.3 & 3.4).
Figure 3.1
Figure 3.2

9
JS PRESSURE RELIEF VALVES
© 2017 Kelso Technologies (USA) Inc. All Kelso Valves are Patent Protected. Detailed designs are subject to change without notice.
Kelso Technologies Inc. 1526 Texas Ave, Bonham, TX. 75418, Phone: [phone]
Document No. - KTUD112
Revision 6 –2/7/2022 (Original Release 12/7/2015)
www.kelsotech.com
Printed in U.S.A.
5. The spring block assembly is secured to the valve body by the drum bolts.
Remove the lock nut from the drum bolt, then pull the drum bolt free from the
spring assembly and valve body. If the drum bolts are not easily removed,
place a slotted screwdriver between the spring coil and the spring block, then
lightly pry the drum away from the spring block. This allows for easier
removal of the drum bolt (Figure 3.5 –3.8).
6. Lift the spring block assembly along with the adjustment screw from the valve
body (Figure 3.9 & 3.10). If necessary, spring assemblies can be removed
from the spring block by removing the securement bolts. During disassembly
it is possible for the spring drum to slide free of the spring assembly. If this
occurs simply tap the drum back into place.
Figure 3.3
Figure 3.4
Figure 3.5
Figure 3.6
Figure 3.7
Figure 3.8

10
JS PRESSURE RELIEF VALVES
© 2017 Kelso Technologies (USA) Inc. All Kelso Valves are Patent Protected. Detailed designs are subject to change without notice.
Kelso Technologies Inc. 1526 Texas Ave, Bonham, TX. 75418, Phone: [phone]
Document No. - KTUD112
Revision 6 –2/7/2022 (Original Release 12/7/2015)
www.kelsotech.com
Printed in U.S.A.
7. The sealing disc can then be lifted and removed from the valve body (Figure
3.11 & 3.12).
3.2 JS75/75S, JS75H/75HS, JS165H/165HS, and
JS75XH/75XHS Seal Disc Disassembly
3.2.1 Needle Bearing Removal
Applies to: JS75H/HS, JS75XH/XHS, and JS165H/HS
1. Remove the top thrust washer (thicker) (Figure 3.13).
2. Remove the needle bearing (Figure 3.13).
3. Remove the bottom thrust washer (thinner) (Figure 3.13).
Figure 3.9
Figure 3.10
Figure 3.11
Figure 3.12

11
JS PRESSURE RELIEF VALVES
© 2017 Kelso Technologies (USA) Inc. All Kelso Valves are Patent Protected. Detailed designs are subject to change without notice.
Kelso Technologies Inc. 1526 Texas Ave, Bonham, TX. 75418, Phone: [phone]
Document No. - KTUD112
Revision 6 –2/7/2022 (Original Release 12/7/2015)
www.kelsotech.com
Printed in U.S.A.
3.2.2 Seal Removal (If Necessary)
1. Turn the sealing disc over and remove the Spirolox® ring. Lift the end
of the ring with a screwdriver and uncoil the ring from the sealing disc
(Figure 3.14).
2. Remove the elastomeric seal carefully with a non-abrasive tool. Do
not damage the seal mating surface.
3.3 JS75L/LS, JS165L/LS, JS75XL/XLS, JS75LT/LTS, and
JS165LT/LTS Seal Disc Disassembly
1. Turn the sealing disc over and remove the seal retainer bolt. Thread locker is
used on the retainer bolt and may prove difficult to loosen. Use caution not to
damage sealing disc if using a vise or other means to hold seal disc while
loosening bolt.
2. Lift the retainer plate from the sealing disc.
3. Remove the elastomeric seal carefully with a non-abrasive tool (Figure 3.15).
Do not damage the seal mating surface.
Figure 3.13
Figure 3.14
Thrust Washer (Thick)
Thrust Washer
(Thin)
Seal Disc
Needle
Bearing

12
JS PRESSURE RELIEF VALVES
© 2017 Kelso Technologies (USA) Inc. All Kelso Valves are Patent Protected. Detailed designs are subject to change without notice.
Kelso Technologies Inc. 1526 Texas Ave, Bonham, TX. 75418, Phone: [phone]
Document No. - KTUD112
Revision 6 –2/7/2022 (Original Release 12/7/2015)
www.kelsotech.com
Printed in U.S.A.
4.0 Inspection
The Valve and most components can be visually inspected without removal from the
tank car; however, a proper inspection should be made whenever the valve is rebuilt or
when suspect operation warrants.
Kelso utilizes a compound authentication procedure whereby all seals are etched
with the pedigree compound and tracing number. If the seal does not have etch,
refer to the car owner for the proper pedigree compound.
4.1 Components
1. The elastomeric seal must be replaced when the valve is rebuilt. Upon
inspection the seal should be secured and concentric in the sealing disc groove
(Figure 4.1 & 4.2). The seal should be free from tears, folds, abrasions,
cracking and a buildup of debris. Replace when any of these defective
conditions occur.
The seal has been manufactured with a proprietary composition and should
only be replaced with Kelso supplied material.
Any necessary replacement parts should be purchased through Kelso
Technologies.
Figure 3.15
Figure 4.1
Figure 4.2

13
JS PRESSURE RELIEF VALVES
© 2017 Kelso Technologies (USA) Inc. All Kelso Valves are Patent Protected. Detailed designs are subject to change without notice.
Kelso Technologies Inc. 1526 Texas Ave, Bonham, TX. 75418, Phone: [phone]
Document No. - KTUD112
Revision 6 –2/7/2022 (Original Release 12/7/2015)
www.kelsotech.com
Printed in U.S.A.
2. The seal disc seat face should be smooth and free from scratches, nicks, and
gouges. The seat face should also be free from paint, dirt, rust, and scale prior
to the application of the elastomeric seal (Figure 4.3 & 4.4).
a. JS75/S, JS75H/HS, JS165H/HS, and JS75XH/XHS Seal Disc
Inspection.
i. Visually inspect the thrust washers and needle bearing for any
damage, this applies to the following: JS75H/HS, JS75XH/XHS,
and JS165H/HS (Figure 4.5).The thrust washers should be flat,
within .025” and not bent or folded. The needle bearing should
not be compressed and be able to rotate freely.
ii. The Spirolox® retaining ring can be reused. If it is deformed or
damaged it should be replaced (Figure 4.6).
Figure 4.3
Figure 4.4

14
JS PRESSURE RELIEF VALVES
© 2017 Kelso Technologies (USA) Inc. All Kelso Valves are Patent Protected. Detailed designs are subject to change without notice.
Kelso Technologies Inc. 1526 Texas Ave, Bonham, TX. 75418, Phone: [phone]
Document No. - KTUD112
Revision 6 –2/7/2022 (Original Release 12/7/2015)
www.kelsotech.com
Printed in U.S.A.
If any component of the bearing assembly is damaged, the assembly should be
replaced. Note: Not all models contain a bearing assembly.
3. The valve seat, or the crown of the seat, must be free from radial cuts, rust, and
corrosion (Figure 4.7 & 4.8). The valve seat is most crucial for correct valve
operation and any discontinuity can cause the valve to leak.
Repair work on pressure devices that involves machining, grinding, welding or
other alterations/modifications can be performed only by the valve
manufacturer, car owner, or a user with the valve manufacturer’s permissions.
(AAR M-1002 Appendix A, Paragraph 3.11)
4. The adjustment screw should be removed from the spring block in order to
examine the threads. A visual exam is all that is needed for the adjustment
screw, unless irregularities exist. Some dings and wear are allowed as long as
the parallel wrenching surfaces, or the hex head, at the top of the screw remain
square and the threads are not damaged. If the surfaces become rounded, the
adjustment screw must be replaced. The threads of the screw should be clean
and lightly lubricated (Figure 4.9, 4.10, 4.11 & 4.12). An appropriately sized
thread die can be used to correct small imperfections. If cracks and/or
fractures are discovered, the adjustment screw should be replaced. The nut
shown in Figure 4.11 should not be removed. This nut acts as a stop for the
sealing disc and is held in place by a roll pin. Verify that the roll pin is present
and securely in place (if applicable).
Figure 4.5
Figure 4.6
Figure 4.8
Figure 4.7

15
JS PRESSURE RELIEF VALVES
© 2017 Kelso Technologies (USA) Inc. All Kelso Valves are Patent Protected. Detailed designs are subject to change without notice.
Kelso Technologies Inc. 1526 Texas Ave, Bonham, TX. 75418, Phone: [phone]
Document No. - KTUD112
Revision 6 –2/7/2022 (Original Release 12/7/2015)
www.kelsotech.com
Printed in U.S.A.
5. To perform an adequate examination of the springs, it is not necessary to
remove them from the spring block. Additionally, before visual inspection, the
springs should be cleaned in order to remove any foreign matter that may be
covering any irregularities. The springs should show no signs of pitting or
corrosion. Exposed surfaces of the spring should be examined for cracking or
any defect (i.e., a nick, gouge, or irregular bend) which could be a stress
concentration. If any of the springs are defective, then the complete spring
assembly should be replaced. When replacing the spring assembly, the
number of spring laminations may vary depending on the valve model. Thus,
the replacement springs should be replaced with springs that are the same
material and that have the same number of laminations. The springs may relax
from around the spring drum over time, which may provide the appearance of
gapping. However, it may be rectified during the rebuild and adjustment
procedures. If rebuild and adjustment does not correct the gapping but the
PRV passes its STDP and BBLT testing, then the springs are not considered
condemnable. (Figure 4.13, 4.14, 4.15 & 4.16).Note: During disassembly it is
possible for the spring drum to slide free of the spring assembly. If this occurs,
simply tap the drum back into place.
Figure 4.9
Figure 4.10
Figure 4.11
Figure 4.12

16
JS PRESSURE RELIEF VALVES
© 2017 Kelso Technologies (USA) Inc. All Kelso Valves are Patent Protected. Detailed designs are subject to change without notice.
Kelso Technologies Inc. 1526 Texas Ave, Bonham, TX. 75418, Phone: [phone]
Document No. - KTUD112
Revision 6 –2/7/2022 (Original Release 12/7/2015)
www.kelsotech.com
Printed in U.S.A.
6. The spring drum should be examined for signs of distress. The drum edges
should not be flared or show signs of cracking. The bore through the drums
should be round and wear of 1/32” or more will require replacement of the drum
(Figure 4.17).Excessive wear can make for uneven adjustment and affect seal
disc seating. Figure 4.18 displays the nominal I.D. dimension for each possible
bolt size and the maximum allowable for each. If the measurement exceeds the
maximum allowable, the drum should be replaced.
Figure 4.13
Figure 4.14
Figure 4.15
Figure 4.16
Figure 4.17

17
JS PRESSURE RELIEF VALVES
© 2017 Kelso Technologies (USA) Inc. All Kelso Valves are Patent Protected. Detailed designs are subject to change without notice.
Kelso Technologies Inc. 1526 Texas Ave, Bonham, TX. 75418, Phone: [phone]
Document No. - KTUD112
Revision 6 –2/7/2022 (Original Release 12/7/2015)
www.kelsotech.com
Printed in U.S.A.
Kelso Technologies does not recommend the disassembly of constant force
springs by field service personnel. Any damage or deterioration that may be
present on the spring assembly will be apparent with a visual inspection.
DO NOT use steel abrasives or steel wire brushes to clean the springs. Doing
so could cause the spring material to become contaminated and corrode
unnecessarily.
4.2 Cleaning
All components, excluding the spring assembly and spring drums, of the Kelso
PRV may be cleaned using the following:
1. Wire brushes and/or clean towel / cloth
2. Low pressure water, glass bead, sand or soda blasting provided the blast
media is not angular in form
3. A chemical / surfactant application, in conjunction with manufactures
prescribed instructions, to achieve a desired result. It is suggested the
chemical / surfactant be of neutral pH to ensure the integrity of the metal
composition
Regardless of cleaning method, it is suggested that the parts be double
rinsed and dried (w/ sanitary towel) prior to reinstallation and immediately
after any chemical / surfactant application.
Disposal should be managed in accordance with all applicable state and
federal regulations.
5.0 Assembly
Prior to assembly, inspect the valve seat on the valve body and ensure that the
area contacting the seal is smooth and free of any irregularities such as nicks,
gouges, depressions, or porosity. Inspect the spring block assembly ensuring the
spring bolts are tight and the spring drums are in place.
5.1 Procedure
Figure 4.18

18
JS PRESSURE RELIEF VALVES
© 2017 Kelso Technologies (USA) Inc. All Kelso Valves are Patent Protected. Detailed designs are subject to change without notice.
Kelso Technologies Inc. 1526 Texas Ave, Bonham, TX. 75418, Phone: [phone]
Document No. - KTUD112
Revision 6 –2/7/2022 (Original Release 12/7/2015)
www.kelsotech.com
Printed in U.S.A.
Kelso utilizes a compound authentication procedure whereby all seals are etched
with the pedigree compound and tracing number. If the seal does not have etch,
refer to the car owner for the proper pedigree compound.
1. Insert the seal into the sealing disc and ensure the seal is seated. For seals
with etching, install the etched side of the seal so that it is in contact with the
sealing disc surface.
a. JS75/S, JS75H/HS, JS165H/HS, and JS75XH/XHS Seal Disc
Assembly.
i. Install the Spirolox® retaining ring, be sure that the ring sits flat
against the seal and is fully engaged in its groove (Figure 5.1).
b. JS75L/LS, JS165L/LS, JS75XL/XLS, JS75LT/LTS, and JS165LT/LTS
Seal Disc Assembly.
i. Place the seal into the sealing disc groove and ensure that it is
properly seated (Figure 5.2).
ii. Apply a thread locking solution to the threads of the retainer
bolt, then install the seal retainer and retainer bolt, torquing the
bolt to 20 in.- lbs.
2. Place the sealing disc assembly onto the valve body, ensuring that the seal is
uniformly contacting the valve seat. The disc should sit freely between the
flange guides (Figure 5.3 & 5.4).
Figure 5.1
Figure 5.2

19
JS PRESSURE RELIEF VALVES
© 2017 Kelso Technologies (USA) Inc. All Kelso Valves are Patent Protected. Detailed designs are subject to change without notice.
Kelso Technologies Inc. 1526 Texas Ave, Bonham, TX. 75418, Phone: [phone]
Document No. - KTUD112
Revision 6 –2/7/2022 (Original Release 12/7/2015)
www.kelsotech.com
Printed in U.S.A.
3. For JS75H/HS, JS75XH/XHS, and JS165H/HS model valves, assemble the
bearing assembly according to Figure 5.5.
a. Insert the thin thrust washer onto the seal disc (Figure 5.6).
b. Insert the needle bearing ring on top of the thin thrust washer.
c. Coat the needle bearing ring with anti-seize (Figure 5.7).
d. Place the thick thrust washer on top of the needle bearing. It should
rotate smoothly on top of the needle bearing (Figure 5.8).
4. Apply a high-quality moly-lube or equivalent to the adjustment screw threads
(Figure 5.9 & 5.10), then thread the adjustment screw into the spring block
Needle
Bearing
Seal Disc
Thrust Washer
(Thick)
Thrust Washer
(Thin)
Figure 5.3
Figure 5.4
Figure 5.5
Figure 5.6
Figure 5.7
Figure 5.8