Gate Valve — Technical Data Sheet

Specification

Materials

Typical applications

• Isolation of process, steam, water and hydrocarbon lines
• Refinery, power and steel plant utilities

Manufacturing

• Body and bonnet: steel castings or forgings from approved foundries and forges, heat treated to the material specification.
• Machining of body, seats, wedge / disc / ball and stem; seat faces lapped.
• Assembly, gland packing and gasket fitting, followed by pressure testing of every valve.

Inspection and testing

• Hydrostatic shell test at 1.5 times the 38 °C rating to API 598.
• Seat test (hydrostatic at 1.1 times rating and / or low-pressure air at 4–7 bar) to API 598.
• Backseat test where the design has a backseat.
• Material certificates for pressure-containing parts; radiography, MPI or DPT of castings when specified.
• Third-party inspection as required by the order.

Marking

Body marking and nameplate to MSS SP-25 and the design standard: manufacturer, size, class, body and trim material, and serial number.

Documentation

Hydrostatic test certificate against each valve serial number, material test certificates for body, bonnet and trim to EN 10204 3.1, and general arrangement drawing. IBR certification on request.

Packing

End protectors on flange faces and weld ends, valves closed (ball valves open), packed in seaworthy wooden cases.

Ordering information

Please state the following on your enquiry:

• Valve type and design standard
• Size and pressure class
• End connection and facing
• Body, bonnet and trim materials
• Operation: handwheel, lever, gear or actuator
• Service fluid, pressure and temperature
• Inspection and certification requirements

Reference information compiled from the published standard for convenience. It does not replace the current edition of the governing standard, which takes precedence. Verify critical dimensions and properties before design, purchase or fabrication. Teshi Engineers & Sales Promoters (P) Ltd accepts no liability for errors or omissions.

Dimensions