Emerson CASH VALVE C776 User manual

CASH VALVE™ TYPE C776 PRESSURE RELIEF VALVES FOR CRYOGENIC SERVICE
INSTALLATION AND OPERATING INSTRUCTIONS
Before installation, these instructions must be carefully read and understood.
PRE-INSTALLATION
Verification of Model and Service Media/
Capacity/Temperature/Pressure Limits
(Reference attached Model Description/Guide.)
Verify the Model Number on the tag against
the Model Number of the order. Verify the
Service Media, Capacity, and Temperature
and Pressure Limits of the valve against
the application.
Please note the marked capacity is based on
Standard Temperature and Pressure conditions
and is valid only for the service media noted
on the catalog order guide. Adjustments to
the capacity must be performed for different
temperatures or service media, and are the
responsibility of the end user to determine.
HANDLING
This pressure relief valve is designed to protect
equipment from overpressure. The valve
should be handled with care, not subjected to
heavy shock loads, and protected to prevent
contamination from getting inside. It should
be installed correctly per A.S.M.E. Boiler &
Pressure Vessel Code requirements, where
applicable. Failure to do so could result in
property damage or serious injury to personnel.
When hoisting the valve into position for
installation, care should be exercised so that
lifting straps do not compromise the integrity
of the valve.
Emerson.com © 2019 Emerson. All rights reserved. VCIOM-13643-EN 22/01
WARNING
Failure to follow these instructions or to properly
install and maintain this equipment could result in
an explosion, fire and/or chemical contamination
causing property damage and personal injury
or death.
Cash Valve relief valves must be installed,
operated and maintained in accordance with
federal, state and local codes, rules and
regulations and Emerson Process Management
Regulator Technologies, Inc. instructions.
If a leak develops or if the outlet continually vents
gas, service to the unit may be required. Failure
to correct trouble could result in a hazardous
condition. Only a qualified person must install or
service the unit.
Installation, operation and maintenance
procedures performed by unqualified personnel
may result in improper adjustment and unsafe
operation. Either condition may result in
equipment damage or personal injury. Use
qualified personnel when installing, operating,
and maintaining the Type C776 Relief Valve.
CALIFORNIA PROPOSITION 65 WARNING
This product can expose you to chemicals
including lead, which is known to the State of
California to cause cancer, birth defects or other
reproductive harm. For more information, go to
www.P65Warnings.ca.gov.
INTRODUCTION
Scope of the Manual
This manual provides instructions for
the handling, installation, operation and
maintenance for the Type C776 Relief Valve.

2
VCIOM-13643-EN © 2019, 2022 Emerson Electric Co. All rights reserved 01/22. Cash Valve is a mark owned by one of the companies in the Emerson Automation
Solutions business unit of Emerson Electric Co. The Emerson logo is a trademark and service mark of Emerson Electric Co. All other marks are the property of their
prospective owners.
The contents of this publication are presented for informational purposes only, and while every effort has been made to ensure their accuracy, they are not to be
construed as warranties or guarantees, express or implied, regarding the products or services described herein or their use or applicability. All sales are governed
by our terms and conditions, which are available upon request. We reserve the right to modify or improve the designs or specifications of such products at any time
without notice.
Emerson Electric Co. does not assume responsibility for the selection, use or maintenance of any product. Responsibility for proper selection, use and maintenance
of any Emerson Electric Co. product remains solely with the purchaser.
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OPERATIONS
1. Maintain a system operating pressure at
least 5 psig or 10% below the set pressure
of the valve, whichever is greater. Operating
too close to the valve set pressure will cause
seat leakage and will shorten the time
between valve maintenance.
2. Do not use the safety valve as a control valve
to regulate system operating pressure.
Excessive operation will cause the seat
to leak and will require more frequent
valve maintenance.
MAINTENANCE
Maintenance should be performed on a
regular basis. An initial inspection interval of
12 months is recommended. Depending on
the service conditions and the condition of the
valve, the inspection interval may be decreased
or increased. Use only Cash Valve parts for
repair. Depending on the local jurisdictional
requirements where the valve is installed,
repairs may have to be made by a repair facility
holding a VR stamp.
WARNING
Removal of the seal wires or any attempt to
adjust, repair or modify this product by non-VR
Certified personnel voids the product guarantee
and may cause serious damage to equipment,
personal injury, and death. Emerson is not liable
for any damage resulting from misuse or
misapplication of its products.
CASH VALVE™ TYPE C776 PRESSURE RELIEF VALVES FOR CRYOGENIC SERVICE
INSTALLATION AND OPERATING INSTRUCTIONS
INSTALLATION
Always wear proper safety equipment, including
safety glasses and ear protection.
1. Mount the valve in a vertical position so that
the valve body is self-draining. If a body drain
port is provided, make sure it is open when
required by the ASME code. Do not plug any
bonnet vent openings. The inlet piping should
be as short as possible, with no elbows,
and equal to or greater than the size of the
pressure relief valve inlet connection. This
will help to limit the inlet pressure drop to
3% or less when the valve is relieving.
2. When discharge piping is connected to valve
outlet, make sure it is self-draining if a body
drain port is not used. The valve should not
be connected to any discharge pipe that
contains pressure before the valve opens or
to any pipe where the pressure build-up is
greater than 10% of the set pressure when
the valve is open and relieving.
Discharge piping, other than a short tailpipe,
must be supported.
3. For threaded valves, to prevent sealing
compound from entering and damaging the
valve, apply a small amount of pipe thread
sealing compound to external threads only.
Do not put any sealing compound on the first
thread or on any internal threads. To do so
may cause the sealing compound to enter
the valve and cause seat leakage.
Do not use the valve body or bonnet for
installing the valve in threaded connections.
Use the wrench flats provided to tighten the
valve to the connecting pipe. Torque valve
enough to ensure a pressure-tight seal
and do not overtighten. To do so may cause
valve leakage.
4. Do not paint, lubricate or allow contaminates
to enter or cover the interior or any working
parts of the valve.