EXHIBIT 21

Subsidiaries of Circor International, Inc.

I Subsidiaries of Circor International, Inc.

1. Spence Engineering Company, Inc., a Delaware Corporation

2. Leslie Controls, Inc., a New Jersey Corporation

3. Circle Seal Controls, Inc., a Delaware Corporation

4. Circor Energy Products, Inc., an Oklahoma Corporation

5. Circor, Inc., a Massachusetts Corporation

6. Circor (Jersey) Ltd., a United Kingdom Company (80% ownership)

7. U.S. Para Plate Acquisition Corp., a Delaware Corporation

8. CIRCOR Business Trust, A Massachusetts Business Trust

9. Dovianus B.V., a Netherlands Corporation

10. Texas Sampling Inc., a Texas Corporation

11. Patriot Holdings, Inc., a Nevada corporation

12. Industria S. A., a French limited liability company

13. Sagebrush Pipeline Equipment Company

14. Circor Luxembourg Holdings Sarl., a Luxembourg limited liability company (approx. 30%)

15. Loud Engineering & Manufacturing, Inc.

II. Subsidiaries of Circle Seal Controls, Inc.:

1. CIRCOR IP Holding Co., a Delaware Corporation

2. Aerodyne Controls Inc., a Delaware Corporation

3. Hoke, Inc., a New York Corporation

4. Circor Luxembourg Holdings Sarl., a Luxembourg limited liability company (approx. 4%)

III. Subsidiaries of Hoke, Inc.:

1. CIRCOR German Holdings Management GmbH, a German Closed Corporation

2. Circor (Jersey) Ltd., a United Kingdom Company (20% ownership)

3. Circor Instrumentation Ltd., a United Kingdom Company

4. Dopak Inc., a Texas Corporation

IV. Subsidiaries of Circor Energy Products, Inc.:

1. Circor Luxembourg Holdings Sarl., a Luxembourg limited liability company (approx. 66%)

V. Subsidiaries of Circor (Jersey), Ltd.:

1. Circor German Holdings, LLC, a Massachusetts Limited Liability Company

VI. Subsidiaries of Circor German Holdings, LLC:

1. Circor German Holdings GmbH & Co. KG

VII. Subsidiaries of Circor German Holdings GmbH & Co. KG

1. Hoke Handelsgesellschaft GmbH, a German Corporation

2. Regeltechnik Kornwestheim GmbH, a German Closed Corporation

VIII. Subsidiaries of Regeltechnik Kornwestheim GmbH:

1. RTK Control Systems Limited, a United Kingdom Corporation

IX. Subsidiaries of Circor Business Trust:

1. Circor Securities Corp., a Massachusetts Corporation

X. Subsidiaries of Dovianus B.V.

1. Keofitt Holding A.S., A Denmark Corporation ( approx 50%)

XI. Subsidiaries of Circor Luxembourg Holdings, Sarl.

1. CEP Holdings Sarl., a Luxembourg limited liability company

2. Circor Energy Products (Canada) ULC, an Alberta unlimited liability company

3. Howitzer Acquisition Limited, a United Kingdom Corporation

XII. Subsidiaries of CEP Holdings, Sarl.

1. Pibiviesse Srl, an Italian Company

XIII. Subsidiaries of Pibiviesse Srl:

1. De Martin Giuseppe & Figli Srl, an Italian Company (approx 80%)

2. Suzhou KF Valve Co., Ltd., a Chinese Wholly Foreign Owned Enterprise

XIV. Subsidiaries of Howitzer Acquisition Limited, a United Kingdom Corporation:

1. Hale Hamilton Holdings Limited, a United Kingdom Corporation

2. Hale Hamilton Valves Limited, a United Kingdom Corporation

3. Hale Hamilton Limited, a United Kingdom Corporation (approx 13%)

XV. Subsidiaries of Hale Hamilton Holdings Limited, a United Kingdom Corporation:

1. Hale Hamilton Holdings Limited, a United Kingdom Corporation (approx 87%)

XVI. Subsidiaries of Hale Hamilton Valves Limited, a United Kingdom Corporation:

1. Cambridge Fluid Systems Limited, a United Kingdom Corporation

2. Fluid Systems International Ltd. a United Kingdom Corporation

3. CFS Technology PTE Limited, A Singapore Corporation