Corrosion-resistant, Bolted Bonnet Gate Valves—Flanged and

Butt-welding Ends

API STANDARD 603

NINTH EDITION, SEPTEMBER 2018

API MONOGRAM PROGRAM EFFECTIVE DATE: MARCH 2019

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iii

Contents

Page

1. Scope 1

2. Normative References 1

3. Terms and Definitions 3

4. Pressure/Temperature Ratings 4

5. Design 4

   1. Body Wall Thickness 4

   2. Bonnet Wall Thickness 5

   3. Body 6

   4. Bonnet 6

   5. Bonnet-to-body Joint 7

   6. Gate 8

   7. Yoke 10

   8. Stem and Stem Nut 10

   9. Packing and Packing Box 11

   10. Bolting 12

   11. Operation 13

   12. Bypasses and Other Auxiliary Connections 13

6. Materials 14

   1. Materials Other Than Trim Materials 14

   2. Trim 15

7. Testing, Inspection, and Examination 15

   1. Inspection and Examination 15

   2. Pressure Tests 15

   3. Repairs of Defects 15

   4. Supplementary Requirements 15

8. Marking 15

   1. General 15

   2. Marking for Unidirectional Valves 16

9. Preparation for Shipment 16

   1. Coatings 16

   2. Openings 16

   3. Gate Position 16

   4. Stem Packing 16

   5. Packaging 16

   6. Purchase Order Information 16

Annex A (informative) API Monogram Program/Use of the API Monogram by Licensees 17

Annex B (normative) Information to be specified by the Purchaser 21

Annex C (informative) Identification of Valve Terms 23

Bibliography 24

Figures

1. Identification of Terms 4

   v

   Contents

   Page

2. Types of Valve Gates 8

3. Wear Travel of a Wedge Gate 9

C.1 Valve Nomenclature 23

Tables

1. Minimum Thickness of Shell/Bonnet Wall, tm and Minimum Diameter of Stem, ds 5

2. Minimum Wear Travel and Maximum Stem Projection 9

3. Stuffing Box and Packing Dimensions 12

4. Materials for Parts 14

vi

Corrosion-resistant, Bolted Bonnet Gate Valves— Flanged and Butt-welding Ends

1. Scope

   1. This standard specifies the requirements for corrosion-resistant bolted bonnet gate valves meeting the requirements of Standard Class, ASME B16.34 and having full port openings for use in process piping applications. 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 sealing;

        
        

      • metallic seating surfaces;

        
        

      • flanged or butt-welding ends.

      
      

      Covering valves of the nominal pipe size DN:

      
      

      — 15; 20; 25; 32; 40; 50; 65; 80; 100; 150; 200; 250; 300; 350; 400; 450; 500; 600.

      
      

      Corresponding to the nominal pipe size NPS:

      
      

      — 1/2; 3/4; 1; 11/4; 11/2; 2; 21/2; 3; 4; 6; 8; 10; 12; 14; 16; 18; 20; 24.

      Applies to pressure class designations:

      
      

      — 150; 300; 600.

      
      

   2. Annex C illustrates a bolted bonnet gate valve for the purpose of establishing standard nomenclature for valve parts.

      
      

   3. The dimensions in metric (SI) units are standard; customary units are shown for reference.

      
      

   4. If product is supplied bearing the API Monogram, and is manufactured at a facility licensed by API, the requirements of Annex A shall apply.

      
      

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

1