Steel Globe Valves—Flanged and Butt-welding Ends, Bolted Bonnets

API STANDARD 623

SECOND EDITION, JANUARY 2021

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Foreword

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Contents

Page

1. Scope 1

2. Normative References 1

3. Terms and Definitions 3

4. Pressure/Temperature Ratings 3

5. Design 3

   1. Body Wall Thickness 3

   2. Bonnet Wall Thickness 5

   3. Body Dimensions 5

   4. Bonnet 8

1. Disc 9

2. Yoke 10

3. Stem, Stem Nut, and Yoke Bushing 10

4. Packing and Packing Box 12

5. Bolting 13

6. Operation 14

7. Stop-check 14

8. Bypasses and Other Auxiliary Connections 14

9. Fugitive Emission Design Requirement 15

1. Materials 15

   1. Materials Other Than Trim Materials 15

   2. Trim 15

2. Testing, Inspection, and Examination 16

   1. Inspection and Examination 16

   2. Pressure Tests 16

   3. Inspection of Castings 21

   4. Repairs of Casting Defects 21

3. Marking 21

   1. General 21

   2. Specific Markings 21

4. Preparation for Shipment 21

   1. Coatings 21

   2. Openings 21

   3. Disc Position 22

   4. Stem Packing 22

   5. Packaging 22

Annex A (normative) Information to be Specified by the Purchaser 23

Annex B (informative) Identification of Valve Terms 25

Annex C (informative) Valve Material Combinations 26

Bibliography 30

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Contents

Figures

Page

1. Identification of Terms 4

2. Typical Disc and Guiding 10

B.1 Valve Nomenclature 25

Tables

1. Minimum Wall Thickness for Body and Bonnet 4

2. Minimum Wall Thickness for Bonnet Neck Extension 6

3. Postweld Heat Treatment of Flange-to-Body Weld 7

4. Minimum Seat Diameter 8

5. Minimum Stem Diameter 11

6. Nominal Radial Width of Packing 13

7. Materials for Parts 16

8. Nominal Seating Surface, Stem, and Backseat Bushing or Weld Deposited Materials and Hardness 17

9. Trim Numbers and Alternative Trim Numbers 21

1. Material Combinations for Group 1 Body, Bonnet, and Cover Materials 26

2. Material Combinations for Group 2 Body, Bonnet, and Cover Materials 27

3. Material Combinations for Group 3 Body, Bonnet, and Cover Materials 28

4. Alternative Body-to-Bonnet Bolting Materials 29

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Steel Globe Valves—Flanged and Butt-welding Ends, Bolted Bonnets

1. Scope

   
   

   This API standard specifies the requirements for a heavy-duty series of bolted bonnet steel globe valves for petroleum refinery and related applications where corrosion, erosion, and other service conditions would indicate a need for heavy wall sections and large stem diameters.

   
   

   This standard sets forth the requirements for the following globe valve features:

   
   

   • bolted bonnet;

     
     

   • pressure seal bonnet;

     
     

   • outside screw and yoke;

     
     

   • rotating rising stems and nonrotating rising stems;

     
     

   • rising handwheels and nonrising handwheels;

     
     

   • straight pattern, y-pattern, right-angle;

     
     

   • stop-check (nonreturn type globe valves in which the disc may be positioned against the seat by action of the stem but is free to rise as a check valve due to flow from under the disc when the stem is in a full or partially open position);

     
     

   • plug, narrow, conical, ball, or guided disc;

     
     

   • metallic seating surfaces;

     
     

   • flanged or butt-welding ends.

   
   

   It covers valves of the nominal pipe sizes NPS:

   
   

   — 2, 21/2, 3, 4, 6, 8, 10, 12, 14, 16, 18, 20, 24;

   
   

   corresponding to nominal pipe sizes DN:

   
   

   — 50, 65, 80, 100, 150, 200, 250, 300, 350, 400, 450, 500, 600;

   
   

   applies for pressure class designations:

   
   

   — 150, 300, 600, 900, 1500, 2500.

   
   

2. Normative References

The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any addenda) applies.

API Standard 598, Valve Inspection and Testing

API Standard 602, Gate, Globe, and Check Valves for Sizes DN 100 (NPS 4) and Smaller for the Petroleum and Natural Gas Industries

API Standard 624, Type Testing of Rising Stem Valves Equipped with Graphite Packing for Fugitive Emissions

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