Emerson CROSBY BP SERIES, OMNI-TRIM Installation, Maintenance And Adjustment Instructions

CROSBY SERIES BP OMNI-TRIM® PRESSURE RELIEF VALVES

InstallatIon, maIntenance and adjustment InstructIons

Before installation these instructions must be read fully and understood

1 GENERAL

Crosby valves have been tested and adjusted
at the factory. As service conditions differ it
may be necessary to make slight adjustments.
These adjustments are made easily if the
instructions below are followed carefully.

WARNING

To have trouble free performance be sure to clean
the inlets and outlets of valves thoroughly before
installing.

2 STORAGE AND HANDLING

Often, valves are on hand at the job site months
before they are installed. Unless stored and
protected properly, valve performance may be
affected adversely.
Rough handling and dirt may damage or
cause misalignment of the valve parts. It is
recommended that the valves be left in their
original shipping containers and that they be
stored in a warehouse or, as a minimum, on a
dry surface with a protective covering until they
are used.

Pressure relieving valves must be handled
carefully and never subjected to sharp impact
loads. They should not be struck, bumped or
dropped. Rough handling may alter the pressure
setting, deform valve parts and affect seat
tightness and valve performance adversely.

NOTE

Where valves have levers as in TypesD and E top
construction, DO NOT LIFT OR CARRY VALVES BY THE
LEVERS.

Inlet and outlet protectors should remain in
place until the valve is ready to be installed on
the system.

3 INSTALLATION

3.1 Inlet piping

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 pressure relief valve in other than
this recommended position might affect its
operation adversely. A valve should never be
installed on a fitting having a smaller inside
diameter than the inlet connection of the valve.
Compliance with the above recommendations
will assure clean, positive valve operation.
Many valves are damaged when first placed
in service because of failure to clean the
connections properly when installed.
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.

3.2 Outlet piping

Discharge piping should be simple and direct.
A broken connection near the valve outlet is
preferred. The weight of the discharge piping
should be carried by a separate support and be
braced firmly against swaying or vibrations.
Fittings or pipe having a smaller inside
diameter than the valve outlet connections
must not be used. The flow from the valve must
discharge to a safe disposal area.

The safety of lives and property often depends
on the proper operation of the pressure relief
valves. The valves must be maintained according
to appropriate instructions and must be tested
periodically and reconditioned to ensure that they
function correctly.

Crosby pressure relief valves described in this
instruction are manufactured in accordance
with the requirements of ASME Boiler and
Pressure Vessel Code, Section VIII. Capacities
are certified by the National Board of Boiler
and Pressure Vessel Inspectors.

Engineering Doc. #IS-V3117A

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VCIOM-06202-EN 18/03

CROSBY SERIES BP OMNI-TRIM® PRESSURE RELIEF VALVES

InstallatIon, maIntenance and adjustment InstructIons

Cap

Adjusting bolt

Adjusting bolt nut

Spring washer (top)

Spindle

Spring

Spring washer (bottom)

Guide

* Cylinder vent hole

Piston O-ring

Guide O-ring

Disc holder

Disc insert

Cylinder O-ring

Cylinder

Seal and wire

Seat O-ring

Base

* This vent must remain open

Threaded connection

Series BP

2