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. Societe Alsacienne Regulaves Thermiques von Rohr, SAS, a French Limited Liability Company

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

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

9. CIRCOR Business Trust, A Massachusetts Business Trust

10. DQS International B.V., a Netherlands Corporation

11. Texas Sampling Inc., a Texas Corporation

12. Patriot Holdings, Inc., a Nevada corporation

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

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. 10%)

III. Subsidiaries of Hoke, Inc.:

1. Hoke Controls, Ltd., a Canadian Corporation

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

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

4. Circor Instrumentation Ltd., a United Kingdom Company

5. Dopak Inc., a Texas Corporation

IV. Subsidiaries of Circor Energy Products, Inc.:

1. Circor Luxembourg Holdings Sarl., a Luxembourg limited liability company (approx. 90%)

V. Subsidiaries of Patriot Holdings, Inc.

1. Loud Engineering & Manufacturing, Inc.

VI. Subsidiaries of Pibiviesse Srl:

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

VII. Subsidiaries of Societe Alsacienne Regulaves Thermiques von Rohr, SAS:

1. SCI MMC, a French Limited Liability Partnership

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

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

IX. Subsidiaries of Circor German Holdings, LLC:

1. Circor German Holdings GmbH & Co. KG

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

1. Hoke Handelsgesellschaft GmbH, a German Corporation

2. Regeltechnik Kornwestheim GmbH, a German Closed Corporation

XI. Subsidiaries of Regeltechnik Kornwestheim GmbH:

1. RTK Control Systems Limited, a United Kingdom Corporation

XII. Subsidiaries of Circor Business Trust:

1. Circor Securities Corp., a Massachusetts Corporation

XIII. Subsidiaries of DQS International B.V. B.V

1. Dovianus B.V., a Netherlands Corporation

2. DQS Vastgoed, a Netherlands Corporation

3. Keofitt Holding A.S., A Denmark Corporation (50% ownership)

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

XV. Subsidiaries of CEP Holdings, Sarl.

1. Pibiviesse Srl, an Italian Company