UNITED STATES
SECURITIES AND EXCHANGE COMMISSION

Washington, D.C.  20549

SCHEDULE 13G

Under the Securities Exchange Act of 1934

(Amendment No.    )

NAME OF ISSUER:  FLOWSERVE CORPORATION

TITLE OF CLASS OF SECURITIES:  Common

CUSIP NUMBER:  34354P105

CUSIP NO.  34354P105

(1)   Names of Reporting Persons            MELLON FINANCIAL CORPORATION
SS or IRS Identification Nos. Of Above Person   IRS No. 25-1233834

(2)   Check the Appropriate Box if a Member of a Group (See Instructions)
(a)   (    ) (b)  (    )

(3)   SEC use only             

(4)   Citizenship or Place of Organization                  United States

Number of Shares             (5)  Sole Voting Power            2,941,161
Beneficially   
Owned by Each                (6)  Shared Voting Power             25,250
Reporting Person
With                         (7)  Sole Dispositive Power       3,474,439

(8)  Shared Dispositive Power        24,500

(9)   Aggregate Amount Beneficially Owned by Each Reporting Person 3,501,589

(10)  Check if the Aggregate Amount in Row (9) Excludes Certain
Shares (see Instructions)                                (    )

(11)  Percent of Class Represented by Amount in Row (9)        6.33

(12)  Type of Reporting Person (See Instructions)              HC

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C.  20549

SCHEDULE 13G
(Under the Securities and Exchange Act of 1934)

Item 1(a)  Name of Issuer:   FLOWSERVE CORPORATION

Item 1(b)  Address of Issuer's Principal Executive Offices:   
222 W Las Colinas Blvd.
Suite 1500
Irving, TX 75039

Item 2(a)  Name of Person Filing:  Mellon Financial Corporation and any other
reporting person(s) identified on the
second part of the cover page(s).

Item 2(b)  Address of Principal Business Office, or if None, Residence:
c/o Mellon Financial Corporation
One Mellon Center
Pittsburgh, Pennsylvania 15258
(for all reporting persons)

Item 2(c)  Citizenship:                      United States

Item 2(d)  Title of Class of Securities:     Common

Item 2(e)  CUSIP Number:  34354P105

Item 3     See Item 12 of cover page(s) ("Type of Reporting
Person") for each reporting person.

BK = Bank as defined in Section 3(a)(6) of the Act

IV = Investment Company registered under Section 8 of the
Investment Company Act of 1940

IA = Investment Advisor registered under Section 203 of the
Investment Advisors Act of 1940

EP = Employee Benefit Plan, Pension Fund which is subject to
the provisions of the Employee Retirement Income 
Security Act of 1974 or Endowment Fund; see
Section 240.13-d(1)(b)(1)(ii)(F)

HC = Parent Holding Company, in accordance with Section
240.13-d(1)(b)(1)(ii)(G)

Item 4  Ownership:  See Item 5 through 9 and 11 of cover page(s)
as to each reporting person.

The amount beneficially owned includes, where appropriate, securities
not outstanding which are subject to options, warrants, rights or
conversion privileges that are exercisable within 60 days.  The filing
of this Schedule 13G shall not be construed as an admission that
Mellon Financial Corporation, or its direct or indirect subsidiaries,
including Mellon Bank, N.A., are for the purposes of Section 13(d) or
13(g) of the Act, the beneficial owners of any securities covered by
this Schedule 13G.

The following information applies if checked: ( ) Mellon Bank, N.A. is the
trustee of the issuer's employee benefit plan (the "Plan"), which is subject to
ERISA. The securities reported include all shares held of record by Mellon Bank,
N.A. as trustee of the Plan which have not been allocated to the individual
accounts of employee participants in the Plan.  The reporting person, however, 
disclaims beneficial ownership of all shares that have been allocated to the
individual accounts of employee participants in the Plan for which directions
have been received and followed.

Item 5  Ownership of Five Percent or Less of a Class:  If this
statement is being filed to report the fact that as of the date hereof
the reporting person has ceased to be the beneficial owner of more
than five percent of the class of securities, check the following (   )

Item 6  Ownership of More than Five Percent on Behalf of Another
Person:  All of the securities are beneficially owned by Mellon Financial 
Corporation and direct or indirect subsidiaries in their various
fiduciary capacities.  As a result, another entity in every instance
is entitled to dividends or proceeds of sale.  The number of 
individual accounts holding an interest of 5% or more is ( 0 ).

Item 7  Identification and Classification of the Subsidiary Which Acquired
the Security Being Reported by the Parent Holding Company:
See Exhibit I.

Item 8  Identification and Classification of Members of the Group:     N/A

Item 9  Notice of Dissolution of Group:                                N/A

Item 10 Certification:  By signing below I certify that, to the best of
my knowledge and belief, the securities referred to above were acquired and
are held in the ordinary course of business and were not acquired and are
not held for the purpose of and do not have the effect of changing or
influencing the control of the issuer of such securities and were not 
acquired and are not held in connection with or as a participant in 
any transaction having such purpose or effect.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, 
I certify that the information set forth in this statement is true, 
complete and correct.  This filing is signed by Mellon Financial
Corporation on behalf of all reporting entities pursuant to Rule
13d-1(f)(1) promulgated under the Securities and Exchange Act of 1934,
as amended.

Date:  January 30, 2004

MELLON FINANCIAL CORPORATION

By:   CATHERINE L. NEIPORT
--------------------------
Catherine L. Neiport
Vice President
Mellon Bank, N.A.
Attorney-In-Fact for
Mellon Financial Corporation

EXHIBIT I

The shares reported on the attached Schedule 13G are beneficially owned by
the following direct or indirect subsidiaries of Mellon Financial Corporation,
as marked (X):

(A)  The Item 3 classification of each of the subsidiaries listed below is
"Item 3(b) Bank as defined in Section 3(a)(6) of the Act."

(x)  Mellon Trust of New England, National Association (parent holding
company of Franklin Portfolio Associates, LLC, TBCAM Holdings, Inc.
and The Boston Company Asset Management, LLC
( )  Mellon Bank DE National Association
(x)  Mellon Bank, N.A. (parent holding company of Founders Asset
Management LLC, The Dreyfus Corporation, Mellon Equity
Associates, LLP and Laurel Capital Advisors, LLP)
( )  Mellon Trust of California
( )  Mellon Trust of New York, LLC
( )  Mellon Private Trust Company, National Association
( )  Mellon Trust of Washington

(B)  The Item 3 classification of each of the subsidiaries listed below is
"Item 3(e) Investment Advisor registered under Section 203 of the 
Investment Advisors Act of 1940."

( )  Boston Safe Advisors, Inc.
( )  Dreyfus Investment Advisors, Inc.
( )  Founders Asset Management LLC
( )  Franklin Portfolio Associates LLC
( )  Laurel Capital Advisors, LLP
(x)  Mellon Capital Management Corporation
( )  Mellon Equity Associates, LLP
( )  Mellon Global Investment Limited
( )  Mellon HBV Alternative Strategies LLC
( )  Newton Capital Management Limited
( )  Newton Fund Managers Limited
( )  Newton International Investment Management Limited
( )  Newton Investment Management (IOM) Limited
( )  Newton Investment Management (Guernsey) Limited
( )  Newton Investment Management Limited
(x)  The Dreyfus Corporation (parent holding company of Dreyfus
Investment Advisors, Inc. and Dreyfus Service Corporation)
(x)  The Boston Company Asset Management, LLC
( )  Mellon Ventures Fund I, LLC
( )  Mellon Ventures II, L.P.
( )  Mellon Ventures, L.P.
( )  Standish Mellon Asset Management LLC
( )  Dreyfus Service Corporation (parent holding company of
Boston Safe Advisors, Inc.)

(C)  The Item 3 classification of each of the legal entities listed below
is "Item 3(g) Parent Holding Company, in accordance with Section 
240.13d-I(b)(ii)(G)."

(x)  MBC Investments Corporation (parent holding company of Mellon
Capital Management Corporation, Mellon UK Holdings, Mellon
Ventures Fund Holding Corp. and Mellon Ventures II, L.P.)
(x)  Mellon Financial Corporation
( )  Newton Management Limited (parent holding company of all Newton
entities listed in (b) above)
( )  The Boston Company, Inc. (parent holding company of Mellon Trust
of California, Mellon Private Trust Company, National Association,
Mellon Trust of New York, LLC and Mellon Trust of Washington)

NOTE:  ALL OF THE LEGAL ENTITIES LISTED UNDER (A) AND (B) ABOVE ARE DIRECT OR
INDIRECT SUBSIDIARIES OF MELLON FINANCIAL CORPORATION.  BENEFICIAL OWNERSHIP
OF MORE THAN FIVE PERCENT OF THE CLASS BY ANY ONE OF THE SUBSIDIARIES OR
INTERMEDIATE PARENT HOLDING COMPANIES LISTED ABOVE IS REPORTED ON A JOINT
REPORTING PERSON PAGE FOR THAT SUBSIDIARY ON THE ATTACHED SCHEDULE 13G AND
IS INCORPORATED IN THE TOTAL PERCENT OF CLASS REPORTED ON MELLON FINANCIAL 
CORPORATION'S REPORTING PERSON PAGE.  (DO NOT ADD THE SHARES OR PERCENT OF
CLASS REPORTED ON EACH JOINT REPORTING PERSON PAGE ON THE ATTACHED SCHEDULE
13G TO DETERMINE THE TOTAL PERCENT OF CLASS FOR MELLON FINANCIAL CORPORATION).