Emerson CASH VALVES Installation, Operation And Maintenance Instructions

CASH VALVES™ TYPE LTC CRYOGENIC REVERSE ACTING TEMPERATURE REGULATOR
INSTALLATION, OPERATION, AND MAINTENANCE INSTRUCTIONS
Before installation, these instructions must be carefully read and understood.
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 regulators 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 the regulator vents gas or a leak develops in
the system, service to the unit may be required.
Failure to correct trouble could result in a
hazardous condition.
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. Only
a qualified person shall install or service the
Type LTC Temperature Regulator.
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
installation, adjustment and maintenance for
the Type LTC Temperature Regulator.
Emerson.com
DESCRIPTION
The Type LTC Temperature Control Valve
is a double-port valve with a range of
0 to -40°F (-17 to -40°C) for low temperature
cut-off. As it is subject to ambient temperature
under normal conditions, it will normally
be in a wide-open position. A copper well is
recommended for each installation, which
allows the removal of the capillary bulb without
depressurizing the system.
Note: Valve seat closure may take several seconds
under normal operating conditions. In addition,
Type LTC fails in the closed position. Type LTC is not
intended to be bubble tight on closing. It is only meant
to drastically reduce flow on sensing temperature
based on set.
TECHNICAL DATA
Service: Liquid or gas
Sizes: ½", ¾", 1", 1¼", 1½" and 2"
Connections: Threaded union inlet and outlet
Operating temperature range:
0 to -40°F (-17 to -40°C)
Standard valve setting: -20°F (-28°C)
Max. temperature limit: 300°F (208°C)
Min. temperature limit: -320°F (-195°C)
Max. body pressure on all sides:
400 psi - see maximum pressure differentials
table on page 3
CONSTRUCTION
Brass union ends; bronze body and trim;
copper capillary armor and bellows; PTFE
gasket and packing; stainless steel spring;
copper bulb and capillary.
Copper bulb is ½" NPT x 5.82"
(15 mm x 147.83 mm). All parts are
commercially cleaned for oxygen service. A
copper well is available as an option and is
recommended for each cryogenic application.
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MAXIMUM OPERATING LIMITS
Operating temperature range is
0 to -40°F (-17 to -40°C); standard setting is
-20°F (-28°C). Maximum temperature limit is
300°F (208°C); minimum temperature limit
is -320°F (-195°C). Maximum body pressure
on all sizes is 400 psi (27.5 bar); however,
for proper operation, maximum pressure
differentials as shown on page 3 must
be observed.
VCIOM-14762-EN 22/01