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

API STANDARD 600 FOURTEENTH EDITION, MAY 2021

API MONOGRAM PROGRAM EFFECTIVE DATE: NOVEMBER 2021

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Contents

Page

1. Scope 1

2. Normative References 1

3. Terms and Definitions 2

4. Pressure/Temperature Ratings 3

5. Design 3

   1. Body Wall Thickness 3

   2. Bonnet Wall Thickness 4

   3. Body Dimensions 4

   4. Bonnet 7

   5. Bonnet-to-body Joint 7

   6. Gate 8

   7. Yoke 10

   8. Stem and Stem Nut 11

   9. Packing and Packing Box 13

   10. Bolting 14

   11. Operation 14

   12. Bypasses and Other Auxiliary Connections 15

   13. Fugitive Emission Design Requirement 15

6. Materials 15

   1. Materials Other Than Trim Materials 15

   2. Trim 16

7. Testing, Inspection, and Examination 17

   1. Inspection and Examination 17

   2. Pressure Tests 17

   3. Repairs of Defects 18

8. Marking 23

   1. General 23

   2. Specific Markings 23

9. Preparation for Shipment 23

   1. Coatings 23

   2. Openings 23

   3. Gate Position 24

   4. Stem Packing 24

   5. Packaging 24

   6. Purchase Order Information 24

Annex A 25

Annex B (normative) Information to be Specified by the Purchaser 26

Annex C (informative) Identification of Valve Terms 28

Annex D (informative) Valve Material Combinations 29

Contents

Page

Annex E (informative) Wear Travel Measurement Technique 33

Bibliography 34

Figures

1. Identification of Terms 4

2. Types of Valve Gates 9

3. Wear Travel Detail 10

4. Backseat Contact Area for Integral Backseats and Backseat Bushings 17

C.1 Valve Nomenclature 28

Tables

1. Minimum Wall Thickness for Body and Bonnet 5

2. Minimum Inside Diameter for Sizes DN 800 to DN 1050 (NPS 32 to NPS 42) in classes 150 and 300 7

3. Minimum Wear Travel and Maximum Stem Projection 10

4. Minimum Stem Diameter 11

   4a Permitted Undertolerance 12

5. Nominal Radial Width of Packing (Metric) 14

6. Nominal Radial Width of Packing (U.S. Customary) 14

7. Materials for Parts 16

8. Nominal Seating Surface, Stem and Backseat Bushing or Weld-deposit Materials and Hardness 19

9. Trim Numbers and Alternative Trim Numbers 23

1. Material Combinations for Group 1 Body, Bonnet, and Cover Materials 29

2. Material Combinations for Group 2 Body, Bonnet and Cover Materials 30

3. Material Combinations for Group 3 Body, Bonnet, and Cover Materials 30

4. Alternative Body to Bonnet Bolting Materials 31

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

1. Scope

   
   

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

   
   

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

   
   

   • bolted bonnet;

     
     

   • outside screw and yoke;

     
     

   • rising stems;

     
     

   • non-rising handwheels;

     
     

   • single or double gate;

     
     

   • wedge or parallel seating;

     
     

   • metallic seating surfaces;

   
   

   — flanged or butt-welding ends.

   
   

   It covers valves of the nominal pipe sizes DN:

   
   

   — 25, 32, 40, 50, 65, 80, 100, 150, 200, 250, 300, 350, 400, 450, 500, 600, 650, 700, 750, 800, 850, 900, 950,

   1000, 1050;

   
   

   corresponding to nominal pipe sizes NPS:

   
   

   — 1, 1 1/ , 1 1/ , 2, 2 1/ , 3, 4, 6, 8, 10, 12, 14, 16, 18, 20, 24, 26, 28, 30, 32, 34, 36, 38, 40, 42;

   4 2 2

   
   

   and applies to pressure class designations:

   
   

   — 150, 300, 600, 900, 1500, 2500.

   
   

   This edition of API 600 states values in both metric and U.S. Customary units of measurement. These systems of units are to be regarded separately. The values stated in each system are not exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems constitutes nonconformance with this standard.

   
   

2. Normative References

The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

API Standard 598, Valve Inspection and Testing

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