Crosby Direct Spring Operated Safety Valves, Crosby-EN Manuals & Guides

CROSBY DIRECT SPRING OPERATED SAFETY VALVES

Operating and safety instructiOns (ped)

Before installation these instructions must be read fully and understood

GENERAL

The intent of these instructions is to acquaint
the user with the storage, installation and
operation of this product.
This safety valve should be used only in
accordance with the applicable operating
instructions and within the application
specifications of the purchase order.
These valves have been tested and adjusted at
the factory. Contact the factory or a Emerson
authorized representative before making any
changes to the settings.

STORAGE AND HANDLING

Because cleanliness is essential to the
satisfactory operation and tightness of a safety
valve, precautions should be taken during
storage to keep out all foreign materials.
Inlet and outlet protectors should remain in
place until the valve is ready to be installed in
the system. Take care to keep the valve inlet
absolutely clean. It is recommended that the
valve be stored indoors in the original shipping
container away from dirt and other forms of
contamination.

Safety valves must be handled carefully and
never subjected to shocks. Rough handling
may alter the pressure setting, deform valve
parts and affect seat tightness and valve
performance adversely.

The valve should never be lifted or handled
using the lifting lever.

INSTALLATION

Many valves are damaged when first placed
in service because of failure to clean the
connection properly when installed. Before
installation, flange faces or threaded
connections on both the valve inlet and
the vessel and/or line on which the valve is
mounted must be cleaned thoroughly of all dirt
and foreign material.
Because foreign materials that pass into and
through safety valves can damage the valve,
the systems on which the valves are tested
and finally installed also must be inspected
and cleaned. New systems in particular are
prone to containing foreign objects that get
trapped inadvertently during construction
and will destroy the seating surface when the
valve opens. The system should be cleaned
thoroughly before the safety valve is installed.
The gaskets used must be dimensionally
correct for the specific flanges. The inside
diameters must clear the safety valve inlet and
outlet openings fully so that the gasket does not
restrict flow.
For flanged valves, draw down all connection
studs or bolts evenly to avoid possible distortion
of the valve body. For threaded valves, do not
apply a wrench to the valve body. Use the hex
flats provided on the inlet bushing.
Safety valves are intended to open and
close within a narrow pressure range. Valve
installations require accurate design both
as to inlet and discharge piping. Refer to
International, National and industry standards
for guidelines.

When it is necessary to use a hoist, the chain
or sling should be placed around the valve body
and bonnet in a manner that will insure that
the valve is in a vertical position to facilitate
installation.

© 2017 Emerson. All Rights Reserved.Emerson.com/FinalControl VCOSI-01083-EN 18/01

CROSBY DIRECT SPRING OPERATED SAFETY VALVES

Operating and safety instructiOns (ped)

INLET PIPING

Connect this valve as directly and close as
possible to the vessel being protected.
The valve should be mounted vertically in an
upright position either directly on a nozzle from
the pressure vessel or on a short connection
fitting that provides a direct, unobstructed flow
between the vessel and the valve. Installing a
safety valve in other than this recommended
position will affect its operation adversely.
The valve should never be installed on a fitting
having a smaller inside diameter than the inlet
connection of the valve.

DISCHARGE PIPING

Discharge piping should be simple and
direct. A ‘broken’ connection near the valve
outlet is preferred wherever possible. All
discharge piping should be run as directly as
is practicable to the point of final release for
disposal. The valve must discharge to a safe
disposal area.
Discharge piping must be drained properly
to prevent the accumulation of liquids on the
downstream side of the safety valve.
The weight of the discharge piping should
be carried by a separate support and be
braced properly to withstand reactive
thrust forces when the valve relieves.
The valve should also be supported to withstand
any swaying or system vibrations.
If the valve is discharging into a pressurized
system be sure the valve is a ‘balanced’ design.
Pressure on the discharge of an ‘unbalanced’
design will affect the valve performance and set
pressure adversely.
Fittings or pipe having a smaller inside
diameter than the valve outlet connections
must not be used.
The bonnets of balanced bellows safety valves
must always be vented to ensure proper
functioning of the valve and to provide a telltale
in the event of a bellows failure. Do not plug
these open vents. When the fluid is flammable,
toxic or corrosive, the bonnet vent should be
piped to a safe location.

SET PRESSURE VERIFICATION TESTING

Set pressure verification testing should
be performed in accordance with
instructions in the applicable Operation
andMaintenancemanual.

SAFETY PRECAUTIONS

• When the safety valve is under pressure never
place any part of your body near the outlet of
the valve.

• The valve outlet and any separate drains
should be piped or vented to a safe location.

• Always wear proper safety gear to protect
hands, head, eyes, ears, etc. any time you are
near pressurized valves.

• Never attempt to remove the safety valve
from a system that is pressurized.

• Never make adjustments to or perform
maintenance on the safety valve while in
service unless the valve is isolated from the
system pressure. If not properly isolated from
the system pressure, the valve may open
inadvertently resulting in serious injury.

• Remove the safety valve prior to performing
any pressure testing of the system. It is
recommended that valves with welded inlets
be tested hydrostatically using hydrostatic
test plugs and caps supplied with the valves.

• The safety of lives and property often depends
on the proper operation of the safety valve.

The valve must be maintained according

to appropriate instructions; be tested
periodically and reconditioned to ensure
correct function.

• For further information including adjustment,
maintenance, cleaning lapping and detail
illustrations, obtain the appropriate
Operation and Maintenance manual from
the following table. These manuals may be
requested from the factory or are available
atEmerson.com/FinalControl.

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CROSBY DIRECT SPRING OPERATED SAFETY VALVES

Operating and safety instructiOns (ped)

WARNING

• If a gagging device is provided with the valve it
must be removed before the valve is put into
service.

• Removal of the seal wires in an attempt
to adjust and/or repair this product by
unauthorized or unqualified persons voids
the product warranty and may cause damage
to equipment and serious injury or death to
personnel.

• This product is a safety related component
intended for use in critical applications.
The improper application, installation or
maintenance of the valve or the use of parts
or components not manufactured by Emerson
may result in a failure of the safety valve.

• Any obstruction due to polymerization,
solidification or solid deposit will affect the
safety performance of this valve. Methods to
reduce such risk should be taken.

• A safety valve should be used only to protect a
system from overpressure during a pressure
upset. It should not be used as a control valve
that is required to operate continuously or as
ablock valve to isolate portions of the system.

It should not be used as a pipe fitting or

transition piece in a piping system.

• Any installation, maintenance, adjustment,
repair or test, performed on the safety
valve must be done in accordance with the
requirements of all applicable Emerson
procedures and instructions as well as
applicable National and International
codesandstandards.

• The information, specifications and technical
data (the ‘Specifications’) contained in this
document are subject to change without notice.

Emerson does not warrant that the

Specifications are current and assumes no
responsibility for the use or misuse thereof. The
purchaser should verify that there have been no
changes tothe Specifications prior to use.

Valve model Operation and maintenance manual

Series 800, 900 OMNI-TRIM IS-V3117 (VCIOM-06205)
BP OMNI-TRIM IS-V3117A (VCIOM-06202)
JOS, JBS, JLT-JOS, JLT-JBS IS-V3137A
JOS-E, JBS-E, JLT-JOS-E, JLT-JBS-E IS-V3137B (VCIOM-06208)
JO, JB OVER T IS-V3175
HS/HC IS-V3100
HCI ISOFLEX IS-V3143 (valves shipped prior to 1998)
HCI ISOFLEX IS-V3143A (valves shipped from 1998) (VCIOM-06204)
HSJ IS-V3146 (VCIOM-01062)
HC/HCA IS-V3147
HC/HCA ISOFLEX IS-V3147A (VCIOM-06201)
HE IS-V3155A
HE ISOFLEX IS-V3155B (VCIOM-01067)
HNB, HNP, HN IS-V3167
HPV and APS2 IS-V3160A
HPV-ST and APS2 IS-V3165A
HL IS-V3184
JCE ES/0/146

HSL IS-V3187 (VCIOM-03104)
Service technicians are available to assist with your installation or other field problems.
Call your nearest Emerson representative.

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.

Emerson.com/FinalControl

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