Marshall Excelsior ME980-8 User manual

Installation Instructions
For: ME980-6, ME980C-6,
ME980-8 and ME980C-8
Marshall Excelsior Company
1506 George Brown Drive Marshall, MI 49068
Phone [phone] Fax [phone]
www.marshallexcelsior.com
The contents of this publication are for informational purposes only. While every effort has been made to ensure accuracy,
these contents are not to be construed as warranties or guarantees, expressed or implied, regarding the products or services
described herein or for their use or applicability. Marshall Excelsior Co. reserves the right to modify or improve the designs
or specifications of such products at any time without notice. The MEC™ logo is the trademark of Marshall Excelsior Co.
Form #496 Rev A
!!!WARNING!!!
READ AND UNDERSTAND ALL INSTRUCTIONS INCLUDED WITH THIS INSTRUCTION
MANUAL. RELIEVE ALL PRESSURE FROM SYSTEM BEFORE SERVICING VALVE
WARNING!
Failure to follow these instructions or to properly
install and maintain this equipment could result in
an explosion and/or fire causing property damage
and personal injury or death.
Marshall Excelsior equipment must be installed,
operated, and maintained in accordance with
federal, state, and local codes and MEC
instructions. The installation in most states must
also comply with NFPA 58 or ANSI K61.1 standards.
Only personnel trained in the proper procedures,
codes, standards, and regulations of the LP-Gas or
anhydrous ammonia industries should install and
service this equipment.
Introduction
Scope of the Manual
This manual provides installation and maintenance
instruction for the ME980-6, ME980C-6, ME980-8,
and ME980C-8 Emergency Shutoff Valves and Cable
Release or Pneumatic Release Assemblies.
Description
ME980 Series(Figure 1) emergency shutoff valves are
intended for in-line use on LP-Gas or Anhydrous
Ammonia (NH3) service.
The valves may be installed at both ends of transfer
hoses where the hose connects the bulk plant piping
to the bobtail, transport, or tank car. They provide a
quick way of shutting off gas flow in the event of a
hose rupture and meet the requirements for such
service when correctly installed with a remote
release and proper piping support. The ME980 Series
ESV valves are lever operated, latch-open, and quick
closing valves. A fusible element in the stem
assembly melts if the temperature reaches 212°F
(100°C), allowing the valve to close.
Figure 1 ME980-6 shown in closed position
Operation
CAUTION!
The ME980 handle and shaft may break if the valve
is forced open against the gas flow and before
pressure is equalized on each side of the main valve
disk.
To Open a Closed Valve:
Close a shutoff valve downstream of the ME980.
Pull the ME980 handle to the "open" position. There
will be a delay in opening as inlet pressure helps hold
the valve disk closed against the seat. The initial
opening force on the handle opens a pilot valve in
the main valve disk, permitting pressure to build-up
downstream. When differential pressure across the
main disk has been reduced, the ME980 can be
opened without further difficulty by continuing to
pull the handle to the open position. When the
handle is fully open the latch engages to hold the
valve open.

CAUTION!
Because the valve is spring closed (aided by
pressure), the handle can snap down with
considerable force when closing. Keep hands and
fingers away from the handle as it closes.
To Close an Open Valve:
Manually pushing the handle to the "closed" position
will close the valve.
From a remote location, pulling on the remote cable
release or exhausting pneumatic pressure from the
ME980 latch will retract the latch plunger allowing
the ME980 to close. If emergency conditions cause
the fusible element to reach a temperature of 212°F
(100°C), the fusible element, which attaches the
handle to the shaft, melts and allows the valve to
close automatically.
Installation
Shutoff Direction
The valves can be placed in a line used either for
filling or withdrawing from the storage tank (or
both). The valve shall be installed in the fixed piping
between a storage tank and the transfer hose
connection to shut off flow from the tank towards
the hose.
WARNING!
The ME980 valves are spring closed (aided by
pressure) and shutoff flow in one direction only.
THE NAMEPLATE FLOW ARROW SHOWS FLOW
DIRECTION FOR VALVE SHUTOFF. The arrow shall
point to the hose connection. Improper flow
direction will not shutoff flow through the line.
The valve can be installed in vertical piping with the
flow arrow pointing in the desired flow direction for
valve shutoff. In some cases the normal flow through
the valve may be opposite the shutoff direction (like
a back check valve).
Fusible Element Location
A fusible element that will close the ME980 shall be
located within five feet of the hose connection. If the
ME980 is placed within five feet of the hose
connection, this requirement is met. If not, an
additional fusible element must be provided near
the hose coupling which will activate a remote
release.
Remote Release Installation
In all installations a remote release shall be
connected to the latch on all emergency valves at
the bulkhead. The remote release has to extend to a
place where it can be easily reached to close the
ME980 valve(s) in the event that an emergency
makes the valve(s) inaccessible. The remote release
shall shutdown all emergency valves when activated.
Remote release activation may be by cable or
pneumatic actuation.
PNEUMATIC RELEASE CONNECTION
1. Attach the remote air source to the cylinder
end with appropriate supply tubing and
valving. A regulated air supply of 30 to 70
PSIG to the ME980 pneumatic release
cylinder is required for proper operation.
NOTE: Nitrogen may be used as a pressure
source.
CAUTION
Possible hand and finger pinch points
between closing ME980 handle and
latch block. Handle closes quickly and
with extreme force. Keep hands and
fingers away from handle as it closes.
2. Test the remote release and ME980
operation. Open the valve. Valve must
engage latch and stay open. HANDLE AND
VALVE MUST QUICKLY "SNAP" CLOSED
when (a) air pressure is exhausted from
ME980 latch (b)remote cable release is
pulled (if applicable), and (c) the handle is
manually pushed closed from the open
position.
WARNING!
All open ME980 Emergency Valve(s) attached to the
remote pneumatic release system must properly
close when air pressure is exhausted from the
system. Remote release controls must quickly
exhaust pressure from the supply line to close
emergency valves.

CABLE RELEASE CONNECTIONS
WARNING!
Remote release cables shall be installed so that
they will close the ME980 valve(s) when pulled
from the farthest remote location. Cable shall
operate smoothly, over pulleys and/or through
conduit. Do not kink cable or run cable around
sharp corners. If installed in conduit, keep water
out of conduit. Frozen water, dirt or dried mud in
the conduit will render the remote release
inoperable.
Remote releases used on ME980 valves shall not:
(a) be made from plastic or fiber rope;
(b) have any kind of fusible link which could melt
and prevent the cable from pulling the ME980
latch.
To provide a remote release, aircraft cable can be
connected to the short looped cable on the valve
and run to the remote release point over pulleys or
through conduit. Adjust the cable so that minimal
pull is required to close the emergency valves.
ME980-906-25 or ME980-906-50
Cable Installation
To connect an ME980 remote release assembly,
which is supplied with either 25' or 50' of cable:
1. Run the inner cable and housing assembly
to the remote release point. Leave enough
slack on each end for a smooth, flowing
path, without sharp bends in the cable,
between the ME980 latch and remote
release handle.
2. If it is necessary to cut the cable to a shorter
length, pull about one foot of inner cable
from the ME980 latch cable end (end with
the 3/16 by 1/2" long cylindrical cast fitting,
(see Figure 2) from the housing.
At the remote release end (other end of
inner cable housing assembly), cut the cable
jacket and inner cable at desired length.
Push the excess inner cable back through
the housing so that the bare cable extends
from the remote release end.
3. Close the ME980 valve.
Latch End
Remote Release End
Figure 2
Lanyard

4. Unscrew the cable guide from the latch
body.
5. Remove the latch pin from the valve body
and remove the latch body from the valve
body.
6. Remove the plunger, spring and lanyard
(not shown).
7. Thread the cable guide onto the latch end
cable fitting and tighten the jam nut.
8. Install the spring on the cable and insert the
cable end in the plunger.
9. Install the plunger, spring and guide into
latch body and TIGHTEN SECURELY.
10. Align the slot in the plunger, insert the latch
body into the valve body and pin in place
with latch pin.
Latch Pin
Jam Nut
Cable Fitting
Plunger
Cable Guide
Figure 3
Plunger Spring
Latch Body
Valve Body

11. Mount the remote release bracket to a
suitable stationary support and mount the
remote release to the bracket.
12. At the remote release end, strip 3/4" of
vinyl cover from cable jacket.
13. Insert the inner cable end completely
through the remote release with pull
handle pushed all the way in. Release cable
should extend beyond the pull handle.
14. Pull any slack through the remote release
(with the pull handle pushed all the way in)
and TIGHTEN CABLE SET SCREW SECURELY.
15. Test the remote release and ME980
operation from the most remote location.
Rotate ME980 valve handle to open valve.
Valve must stay open. HANDLE AND VALVE
MUST QUICKLY "SNAP" CLOSED when (a)
the remote release cable is pulled, and (b)
ME980 valve handle is pushed closed from
the open position.
16. Cut-off excess cable from pull handle.
WARNING!
All open ME980 emergency valve(s)
attached to the remote release must
properly close when the release cable is pulled.
Maintenance
WARNING!
Only qualified service personnel should attempt to
repair these valves. Before starting any type of
repair, close off the upstream valves in the system
and remove all pressure from both the inlet and
outlet of the ME980 Emergency Shutoff Valve.
At least once a month, inspect and check the
following:
1. See that the remote release is properly
connected, works freely, and is not
worn. Operate the release to make
certain it closes the valve. If the valve
closes slowly, packing replacement may
be required.
2. Make sure that the lever, latch, and release
are working smoothly. The latch parts and
lever are easily accessible for replacement
or repair by removing the securing bolts.
3. Check for packing and joint leakage.
Replacing Internal Parts
ME980 can be repaired in the field. However, due to
the special fire resistant seals and assembly
techniques, repairs should be done only by trained
personnel. If repair should become necessary,
contact your local Marshall Excelsior Distributor for
information and assistance.
Only parts manufactured by Marshall Excelsior Co.,
should be used for the repair of ME980 Series ESV
Valves. Be sure to give the complete model number
of the ME980 valve when corresponding with your
local distributor.
ME980 valves that have been disassembled for
repair must be tested for proper operation before
being returned to service.
Remote Release
Release Bracket
Figure 4

Components List
1. Body - 3/4" NPT or 1" NPT
2. Flange - 3/4" NPT or 1" NPT
3. Stem
4. Gland
5. V-Packing
6. Male V-Packing
7. Packing Washer
8. Packing Spring
9. Nameplate Dial
10. Nameplate
11. Valve Seat Retainer
12. Handle Spring
13. Handle Rod
14. Handle Knob
15. Graphite Seal
16. Flange O-Ring
17. Flange Screw
18. Valve Seat
19. Release Pin
20. Thermal Pin
21. Handle Washer
22. Handle Screw
23. Handle Body
24. Female v-Packing
25. Spring Winder
26. Square Key Machined
27. Stem Bearing Washer
28. Gland Bearing
29. Nameplate Screw
30. Clapper Assembly
31. Release Assembly - Cable or Pneumatic
32. 1/4" NPT Plug