Parker 7121Z028 Installation, Operating, & Maintenance Instructions

FLUID CONTROL DIVISION
Parker Hannifin Corporation
95 Edgewood Avenue
New Britain, CT 06051
Telephone (860) 827-2300
Fax (860) 827-2384
INSTALLATION, OPERATING & MAINTENANCE INSTRUCTIONS
!
WARNING
GENERAL SAFETY INSTRUCTIONS
INSTALLATION
FAILURE OR IMPROPER SELECTION OR IMPROPER
USE OF THE PRODUCTS AND/OR SYSTEMS
DESCRIBED HEREIN OR RELATED ITEMS CAN
CAUSE DEATH, PERSONAL INJURY AND PROPERTY
DAMAGE.
This document and other information from Parker Hannifin
Corporation, its subsidiaries and authorized distributors
provide product and/or system options for further
investigation by users having technical expertise. It is
important that you analyze all aspects of your application,
including consequences of any failure, and review the
information concerning the product or system in the
current product catalog. Due to the variety of operating
conditions and applications for these products or systems,
the user, through its own analysis and testing, is solely
responsible for making the final selection of the products
and systems and assuring that all performance, safety
and warning requirements of the application are met.
The products described herein, including without
limitation, product features, specifications, designs,
availability and pricing, are subject to change by Parker
Hannifin Corporation and its subsidiaries at any time
without notice.
Carefully read installation, operation and maintenance
procedures prior to installing or servicing valve.
Do not use valve as a safety shut-off valve when making
repairs.
Do not install a valve before depressurizing system down
to atmospheric pressure.
Care must be taken to ensure that the valve materials
selected are suitable for the media being handled. Parker
assumes no liability for damage caused by improper
material selection.
Caution: Do not, at any time, make any alteration or
modifications to any valve without the express and written
approval of Parker's Fluid Control Division.
IOM M7121
(Rev 02/09)
FUEL SELECTOR VALVES
7121Z027 6-PORT
7121Z028 3-PORT
2-WAY NORMALLY CLOSED, DIRECT ACTING
BEFORE
Page 1
DESCRIPTION
These fuel selector valves are for applications where
either of two fuel tanks can be used to feed a single
consumption device, such as an engine or generator. The
3-Port version is used when all the fuel being supplied to
the device is consumed. The 6-Port version is used when
only a portion of the fuel being supplied is consumed, and
the remainder must be returned to a fuel tank.
These valves incorporate either two (3-Port) or four (6-
Port) 2-way Normally Closed direct operated valves.
These direct acting valves
differentials from zero to three psi.
The valves are installed in the fuel system between the
fuel tank and the fuel pump. Typical installation would be
for the fuel pump to draw fuel from the fuel tank, pulling it
through a filter, then through one of the incorporated
supply valves. Any unconsumed fuel from the engine
flows through one of the incorporated return valves and
returns to one of the fuel tanks.
These valves incorporate an emergency manual override.
When in use a complete flow path through the valve is
opened. In the 6-Port version this includes opening the
return flow path.
Valves are normally supplied with open enclosure
integrated coils, in voltages of either 12 VDC or 24 VDC.
FLUID CODES
Listed below are common fluid codes. The codes for the
approved fluids for use with these valves are printed on
the outside of the individual packaging.
CODE FLUID
A - Air or nontoxic, nonflammable gases
AC - Acetylene
G - City gas supplied by public utilieis
GA - Gasoline
HO - Petroleum based oils having viscosities up to
400SSU at 38°F
02-06 No 2 thru No 6 oil
W - Water or other aqueous nonflammable liquids
Maximum fluid temperature - 160°F
Maximum ambient temperature - 170°
operate at pressure