19
13 MAINTENANCE EQUIPMENT
Reseating machines
Reseating machines will remachine the nozzle
seats in place without removing the safety valve
from the installation. Form cutters are used to
cut a new seat to exact dimensions. Reseating
machines, cutters and auxiliary equipment may
be rented or purchased. Contact the factory.
Jacking devices
When a safety valve is to be disassembled and it
is desired to retain spring compression, i.e., the
set pressure, a mechanical or hydraulic jacking
device may be used. Jacking devices are used
to lift the bottom spring washer sufficiently to
allow the disc or disc insert to lift clear of the
nozzle (permitting the entire bonnet assembly
to be removed). Jacking devices may be rented
or purchased. Contact the factory.
Air (ASPD) and hydraulic (HSPD) set
pressure devices
The set pressure of safety valves may be
determined without raising system pressure
to the popping pressure of the valves by using
a set pressure device which may be rented or
purchased.
The apparatus consists of a lifting device
mounted on the bonnet and connected to the
spindle of the safety valve.The differential
force required to open the safety valve when
the system (steam) pressure is less than the
valve set pressure is applied by the operator.
The differential force at which the valve
opens is determined and the safety valve set
pressure is calculated from this measurement.
Contact the factory.
Reseating machine
Air set
pressure device
Hydraulic set
pressure device
CROSBY
®
STYLES HC AND HCA ISOFLEX™ SAFETY VALVES
INSTALLATION, MAINTENANCE AND ADJUSTMENT INSTRUCTIONS
12 FIELD SERVICE REQUIREMENTS
Field service
Crosby operates an extensive field service
organization capable of adjusting, setting
and maintaining Crosby valves worldwide.
Emerson service technicians, factory trained
and long experienced in servicing safety valves,
are located throughout the world for fast
response to our customers’ needs. It is strongly
recommended that on new installations a
Emerson service technician be present for
assembly and testing of safety valves.
Service equipment available
All service equipment mentioned in this
instruction is available for purchase or rental.
Any Emerson sales office, representative or
service manager can expedite your service
equipment requirements.
FIGURE 15
Neither Emerson, Emerson Automation Solutions, nor any of their affiliated entities assumes responsibility for the selection, use or maintenance of any product.
Responsibility for proper selection, use, and maintenance of any product remains solely with the purchaser and end user.
Crosby is a mark owned by one of the companies in the Emerson Automation Solutions business unit of Emerson Electric Co. Emerson Automation Solutions, Emerson
and the Emerson logo are trademarks and service marks of Emerson Electric Co. All other marks are the property of their respective 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.
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