CROSBY
®
STYLES HC AND HCA ISOFLEX™ SAFETY VALVES
INSTALLATION, MAINTENANCE AND ADJUSTMENT INSTRUCTIONS
Before installation these instructions must be read fully and understood
TABLE OF CONTENTS
1. Style HC/HCA ISOFLEX - parts ..................... 2
2. Introduction ................................................... 3
3. Description of safety valve ............................ 4
4. Storage ........................................................... 4
5. Installation ..................................................... 5
6. Hydrostatic testing ........................................ 6
7. Operation ....................................................... 9
8. Testing.......................................................... 10
9. Valve maintenance ...................................... 12
General information .................................... 12
Disassembly ................................................ 12
Repair procedure ........................................ 14
10. Valve assembly ............................................ 16
11. Spare parts .................................................. 18
12. Field service requirements ......................... 19
13. Maintenance equipment ............................. 19
WARNING
Suitability of the material and product for
the use contemplated by the buyer is the
sole responsibility of the buyer. Also storage,
installation and proper use and application are
the sole responsibility of the purchaser. Emerson
disclaims any and all liability arising out of same.
Any installation, maintenance, adjustment,
repair and testing performed on safety relief
valves should be done in accordance with
the requirements of all applicable codes and
standards under which those performing such
work should maintain proper authorization
through appropriate governing authorities. No
repair, assembly and test work done by other
than Emerson shall be covered by the warranty
extended by Emerson to its customers.You
assume full responsibility for your work. In
maintaining and repairing Crosby products, you
should use only parts manufactured by Emerson.
Call your nearest Emerson sales office or our
factory for a service engineer should you wish
assistance with your field needs.
Safety precautions
Proper handling, storage, installation,
maintenance and operation is essential to the
safe and reliable functioning of any pressure
relief product.
Precautionary statements in the form of
warnings, cautions and notes are used
throughout this instruction to emphasize
important and critical factors where applicable.
Examples:
WARNING
An operating procedure or practice which, if not
observed strictly, may result in injury to personnel
or loss of life.
CAUTION
An operating procedure or practice which, if not
observed strictly, may result in damage to or
destruction of equipment.
NOTE
An operating procedure or condition which is
highlighted, underlined or printed in bold type for
emphasis.
These precautionary statements are by no means
exhaustive. Emerson cannot be expected to know,
evaluate and advise customers of all conceivable ways
in which tasks might be performed, or of the possible
hazardous consequences of each way.
Emerson.com/FinalControl
© 2017 Emerson. All Rights Reserved.
VCIOM-06201-EN 17/05
Consequently, Emerson has not included
such comprehensive evaluation and disclaims
liability for work performed by other than
Emerson personnel. All personnel working with
Crosby products should be trained adequately
and be thoroughly familiar with the contents of
this manual.
Emerson cannot evaluate all conditions that
might injure personnel or damage equipment.
However, Emerson does offer the following
general safety precautions:
• Hearing and eye protection should be used
when working on a valve which is under
pressure.
• Never strike a valve which is under pressure.
Premature actuation can result.
• Never stand in front of the discharge outlet
of a pressure relief valve which is under
pressure.
Always approach and use any pressure relief
valve with great care.
Often, the safety of lives and property
depends on the proper operation of the
safety valves. Consequently, the valves
should be kept clean and should be tested
periodically and reconditioned to make sure
they function properly.
Engineering Doc. #IS-V3147A
