2” NPT
MULTI-PORT RELIEF
VALVE MANIFOLD – SERIES
INSTRUCTION MANUAL
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 #996 Multi-Port Relief Valve Manifold IOM Revisi on Date 11/05/15 Rev B
1506 George Brown Dr.
Marshall, MI 49068
Phone (269) 789-6700
Fax (269) 781-8340
www.marshallexcelsior.com
!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.
Install, operate and maintain Marshall Excelsior Co.
equipment in accordance with federal, state, and local codes
and these instructions. The installation in most states must
also comply with NFPA standards 58 and 59, and ANSI/CGA
6.2.1.
Only personnel trained in the proper procedures, codes,
standards and regulations of the LP-Gas and NH3 industries
should install, maintain and service this equipment.
Be sure all instructions are read and understood before
installation, operation and maintenance. These instructions
must be passed along to the end user of the product.
!GENERAL WARNING!
Marshall Excelsior products are mechanical devices that are
subject to wear, contaminants, corrosion, and aging of
components made of materials such as rubber and metal.
Over time these devices will eventually become inoperative.
The safe service life of these products will reflect the
environment and conditions of use that they are subjected to.
Regular inspection and maintenance is essential. Marshall
Excelsior products have a long record of quality and service, so
LP-Gas dealers may forget hazards that can arise from using
aging devices that have outlived their safe service life.
APPLICATION
:
For use with LPG & NH3 stationary storage containers with 2”
NPT connections. These Relief Manifolds have an additional
relief valve excluded from the flow rating, which allows for
service and/or exchange of any one relief valve without
evacuating the tank. Our large port selection handle allows for
each specific valve port to be closed off so that the relief valve
may be removed while the remaining valves remain under
pressure protecting the tank and contents. Each manifold
model is rated based on the flow through the relief valves with
one valve removed from service.
FEATURES:
• Ductile Iron Body
• All Stainless Steel Internal Components
• Durable Teflon V-Pack Stem Seals
• Large Diameter Port Selection Handle and Port Indicator
• Molded Rubber Weather Guard for Manifold Rotary Gear
• Available with 250 PSIG and 265 PSIG Relief Valve Set
Pressures
• Relief valves provided with weep hole for drainage.
REQUIREMENTS FOR PRESSURE RELIEF VALVES
Every container used for storing or hauling LP-Gas and
anhydrous ammonia must be protected by a pressure relief
valve. These valves are designed to protect the container
against the development of hazardous conditions which might
be created by any of the following:
Hydrostatic pressures due to overfilling or the trapping
of liquid between two points.
High pressures resulting from exposure of the
container to excessive external heat.
High pressures due to the use of incorrect fuel.
High pressures due to improper purging of the
container.
NOTE
Consult NFPA #58 for LP-Gas and ANSI/CGA 6.2.1 for anhydrous
ammonia, and/or any applicable local and state regulations
governing the application and use of pressure relief valves.
