API 600 Gate Valve
Reference: SDG4162P20/07 3/31/2020, Location: Asia
Category: Gate Valves
Scope of Work
The company announces its need for Supply 100 of 4" X 900 Class RTJ, Flanged Ends (API 600 Design) Cast Carbon Steel Gate Valve as per 600 Specification, Regular Type, Rising STEM, Bolted\Bonnet, Outside & Yoke, Integrally Cast Flexible Wedge Gate, with Companion Flange in both sides End Flange having Serrated Raised Face Drilled in Accordance with ANSI B 16.5 face to face dimension as per ANSI B 16.10 & tested as per API 598 Specification.
Detailed Technical Specifications are as under:
A) Body & Bonnet : Cast Carbon steel ASTM A 216 Gr. WCB, body and bonnet of Radiographic quality casting. Two nos. of valves from each line item will be radiographed as per ASME 16.34.
B) Stem: Renewable type back seat bush and rising type stem made of ASTM-276T 410/AISI 410/ASTM A 182 Gr. F6A having Double Start Threading and surface hardened preferably with nitriding.Stem should be Mirror Finish Quality.Thread of the stem should be left handed. Stem should be forged as per API 600 design(latest edition) to ensure better valve performance & durability.
C) Wedge:Sand cast steel gate. HF type flexible wedge (tapered) design, face
made up with 13% Cr. SS. Base material of the wedge is ASTM A 216 Gr. WCB. Wedge face should be ground and lapped to suitable flatness. Tee slot of the stem wedge connection should be along the perpendicular direction to the flow of the fluid and shall be within the periphery of the wedge.
D) Back seat bush: Back seat bush should be 13% Cr. SS.
D) Body & Seat Ring : Seat Rings will be stellited and seat welded to the body. The base material of the seat ring will be ASTM A 105.Hardness difference between wedge and seat should be minimum 50 BHN. Seat should be harder than wedge.
E) Gland Packing : Graphite with Braided End Rings having inconel wire supports with sacrificial corrosion inhibitor pre-stressed individually. All valves shall have back seating arrangement for replacing gland packing during operation/ pressurized condition of the valve.The gland packing should be suitable to operate at high temperature service and in oil & gas environment.
F) Gland Bolts : Swing type eye bolt and nuts.
G) Hand Wheel : Direct hand wheel operated valve of sproke and rim design with arrow mark pointing in the direction of opening the valve made of ASTM A 216 Gr.WCB.
H) Stud, Bolts and Nuts: High tension stud, bolts and nuts confirming to A-193 Gr. B7 and A-194 Gr.2H.
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