API600 Gate Valve

Gate valve refers to a valve whose closing member (gate) moves in the vertical direction of the center line of the passage, mainly constructed by valve body, bonnet, stem gate, sealing packing, handwheel/gearbox and other components. Normally the two ends of the valve are connected to the pipeline with flange using studs and nuts.


1. Stem: forged steel, single-part, ACME screw.
2. Body and bonnet: high quality and precision tooled cast iron.
3. Bore: Full port that guarantees minimum turbulence and minimum flow resistance.
4. Backseat: screwed into bonnet.
5. Flexible wedge.


Universal trim: 13Cr stem, wedge in CA 15 or 13Cr faced, and CoCr alloy faced seat API Trim 8 suitable for applications up to 850°F (454°C).
Seat face CoCr alloy hardfaced, ground and lapped to a mirror finish.
Flexible wedge with low center stem-wedge contact, in solid CA15 (13Cr) or hardfaced with 13Cr, SS 316, Monel or CoCr alloy. Wedge is ground and lapped to a mirror finish and tightly guided to prevent dragging and seat damage.
A CoCr alloy hardfaced CF8M wedge is also available.
Non-rotating stem with precision Acme threads and burnished finish. Double Acme for faster operation.
Body and bonnet joint accurately machined.
Body and bonnet castings are precision machined.
One-piece bonnet for better alignment and fewer parts for Class 150 up to NPS 16 (DN 400).
ASME Classes: 150–300: 1⁄16” raised face
ASME Classes: 600–1500: ¼” raised face
Finish: 125–250 AARH for all valves.
Rotating stem nut is Austenitic ductile iron Gr. D-2C renewable in line (as shown).
When handwheel is used, thrust bearings are supplied as follows:
ASME Classes 150–300: NPS 10–12 (DN 250–300), 1 bearing (top)
NPS 14 (DN 350) and up, two bearings
ASME Classes 600–1500: NPS 6 (DN 150) and up.

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