1 Scope
This standard specifies the structure form and dimension, technical requirements, materials, test methods and inspection rules as well as marking, coating, shipping and storage of the wafer type check valves.
This standard is applicable to wafer type check valves with the specific applicable parameters as follows:
Wafer type double disc swing check valves with the nominal pressure less than or equal to PN 420 and the nominal dimension of DN 50~DN 2100;
Long series of wafer type single disc swing check valves and wafer type butterfly check valves with the nominal pressure less than or equal to PN 420 and the nominal dimension of DN 50~DN 1200;
Short series of wafer type single disc swing check valves with the nominal pressure less than or equal to PN 260 and the nominal dimension of DN 50~DN 2100;
Wafer type lift check valves with the nominal pressure less than or equal to PN 160 and the nominal dimension of DN 15 ~DN 350.
Flanged double disc swing check valves may refer to this standard for implementation.
2 Normative References
The provisions of the following standards, through reference in this standard, constitute the provisions of this standard. For dated reference, subsequent amendments to, or revisions of, any of these publications do not apply. However, all parties coming to an agreement according to this standard are encouraged to study whether the latest editions of these documents are applicable. For undated references, the latest edition of the normative document is applicable to this code.
Foreword I
1 Scope
2 Normative References
3 Structure Form and Parameters
3.1 Structure Form
3.2 Parameters
4 Technical Requirements
4.1 Pressure-temperature Rated Value
4.2 Valves
4.3 Disc
4.4 Sealing Surface
4.5 Flow Direction Indication
4.6 Gasket
4.7 Shell Strength and Sealing Performance
5 Materials
5.1 Valve and Bonnet
5.2 Disc
5.3 Sealing Elements
5.4 Internals Contacted With Medium
5.5 Spring
5.6 Plug Screw
5.7 Nameplate
6 Test Methods and Inspection Rules
6.1 General Provisions
6.2 Test Methods
6.3 Inspection Rules
7 Marking
7.1 Items
7.2 Valve Marks
7.3 Nameplate Marks
8 Coating, Shipping and Storage
8.1 General Provisions
8.2 Coating
8.3 Shipping
8.4 Storage
Appendix A (Informative) Order Contract Data Sheet for Wafer Type Check Valves
Figure 1 Wafer Type Double Disc Swing Check Valve
Figure 2 Long Series of Wafer Type Single Disc Swing Check Valve
Figure 3 Short Series of Wafer Type Single Disc Swing Check Valves
Figure 4 Wafer Type Lift Check Valve
Figure 5 Wafer Type Butterfly Check Valve
Figure 6 Wafer Type Double Disc Swing Check Valve for the Lug
Figure 7 Double-flanged Double Disc Swing Check Valves
Figure 8 Wafer Type Connection
Figure 9 Wafer Type Connection for Lugs
Figure 10 Double-flange Connection
Figure 11 Size of the Sealing Pressure Plate and Fastener on the Interface of the Valve
Table 1 Minimum Wall Thicknesses of Steel Wafer Type Swing Check Valves and Steel Wafer Type Butterfly Check Valves
Table 2 Minimum Wall Thicknesses of Iron Wafer Type Swing Check Valves and Iron Wafer Type Butterfly Check Valves
Table 3 Structural Lengths of Wafer Type Double Disc Swing Check Valves, Long Series of Wafer Type Single Disc Swing Check Valves and Wafer Type Butterfly Check Valves
Table 4 Structural Lengths of Short Series of Wafer Type Single Disc Swing Check Valves
Table 5 Structural Lengths of Wafer Type Lift Check Valves In mm
Table 6 Size Ranges of the Sealing Pressure Plate and Fastener on the Interface of the Valve
Table 7 The Common Materials of Metal Sealing Elements
Table 8 Inspection Items, Technical Requirements and Inspection Method
Table 9 Minimum Base Number for Sampling and Sampling Number
