Mec Excelerator ME990S-2DFM Installation And Operating Manual

!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.
MEC equipment must be installed, operated, and maintained
in accordance with federal, state, and local codes and
manufacturer's instructions. The installation in most states
must also comply with NFPA No. 58, and ANSI/CGA G-2.1.
For installation in the European Union, the equipment must
also comply with PED/TPED and EN ISO standards. Periodic
inspections, intermediate inspections and exceptional checks
of transportable pressure equipment should be carried out
in accordance with the Annexes of Directive 2008/68/EC and
with 2010/35/EU Directive (TPED) to ensure continued
compliance with their safety requirements.
Only personnel trained in the proper procedures, codes,
standards, and regulations of the LP-Gas industry should
install and service this equipment.
The internal valve must be closed except during product
transfer. A line break downstream of a pump may not
actuate the excess flow valve. If any break occurs in the
system or if the excess flow valve closes, the system should
be shut down immediately.
WARNING:
These products contain a chemical
known to the state of California to cause cancer and
birth defects or reproductive harm
Scope of the Manual
This manual covers instructions for the ME990S-2F-16 and
ME990S-2DFM "Excelerator" Series 2" single and double
flange internal valves.
Introduction
ME990S-2F-16 and ME990S-2DFM "Excelerator" Series
Internal Valves are designed to provide accelerated
equalization of tank pressure and downstream line
pressure, providing fast valve response time for quick
opening. These internal valves are frequently used on
bobtail and transport truck tanks for liquid gas delivery,
but they may also be used on large stationary storage
tanks and on in-line installations in liquid or vapor gas
transfer applications. U.L. listed types are designed for use
with Propane or NH (Anhydrous Ammonia) services. Non
3
U.L. listed models are available with a variety of trim types
and body styles and can be used on other compressed
gases, but the installer should check with the factory to
make sure the valves are suitable for the particular service.
Marshall Excelsior Company
1506 George Brown Drive Marshall, MI 49068
Phone (269) 789-6700 Fax (269) 781-8340
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 #995 ME990S-2F-16 & ME990S-2DFM IOM
ME990S-2F-16 AND ME990S-2DFM
2" FLANGED INTERNAL VALVE
INSTALLATION AND
OPERATING MANUAL
ME990S-2DFM
Actuation of the valve can be achieved manually, by cable,
or with a pneumatic actuator.
Features

Excelerator equalization bleed area - Provides high
bleed flow for quick opening.

Unique Serviceability Features - Accessible
stainless steel stem hex and socket drive retaining
screws for easy maintenance.

Durable Design:
o
Stainless poppet and stem with hardened, low
friction coating operates smoothly for a long
wear life
o
Fully captured main seal and molded-on bleed
seal will not "Blow-out"
o
Large poppet retaining thread will not break
during reverse flow fill
o
Integral travel stop
o
Stainless steel roller cam

Excess Flow Closure - Functions when flow exceeds
the rated capacity of the valve or piping is sheared
off at the valve.

Back Check Feature - Allows reverse flow filling
with or without actuator device in valve open
position.

Spring loaded Polytetrafluoroethylene (PTFE) stub
shaft packing with auxiliary wiper seals

Rulon® bushings at critical wear points.

Manual, Cable, or Air Open/Close valve actuators.

Thermal Fusible links or plugs melt at 212°F
(100°C) and allow valve closure in the event of a
fire at the valve.
MEC Europe AsP
Alsvej 21
8940 Randers SV
Denmark
ME990S-2F-16
Rev E 2/3/21