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Declaration:
Gate valves serve as efficient stop valves with flow in either direction. They are commonly used where a minimum pressure drop is important. Throttling is not recommended because partially open gate valves exhibit flow characteristics not conducive to accurate and consistent flow control. Also, the valves may be damaged by the high velocity across the seats. They function best fully open or fully closed.
Features
1. Flexible Wedge. Compensates for deformation of body due to pipe stresses. Will not stick when valve is closed hot and allowed to cool.
2. Outside screw and Yoke (OS&Y)
3. Seat ring is threaded into the body for 6" or below to carry out a renewable feature.
4. Seat ring is seal welded for 8" or above to eliminate leak path.
5. Fugitive Emissions less than 100 ppm with standard requirements
Standards
These valves comply with the applicable requirements of the following standards:
API 600, API 598, API RP591, ASME B16.34, ASME B16.25, ASME B16.10 and ASME B16.5
Inspection Policy for WAYS valves
Every WAYS cast steel valve is subjected to a 100% pressure test according to API 598 requirements. Manufacturer's material test reports and Inspection and Test Certifications are available upon request. Some of the additional inspections and tests performed are:
1. Random Radiograph Inspection of Body and Bonnet Castings to ASME B16.34 Appendix B
2. Random Chemical Composition and Mechanical Properties Verification of Fasteners to ASTM A-193/A-194
3. Liquid Penetrate Inspection of Seat Rings
4. Visual Inspection of Casting to MSS-SP-55
5. Receiving, In-Process, and Final Dimensional Inspections to Relevant Valve Standards
6. Other inspections or tests can be performed or evaluation criteria applied when specified by the customer.
Gate Valve
