ANSI Gate Valve

Size range : 2”-48”
Class : 150LB -2500LB
Temperature : ≤425℃
Materials:WCB,WC6,WC9,C5,C12,CF8,CF8M,CF3M,SS321,904L etc.

Technical specification
●Design Standard: API600 / BS1873
●Face To Face: ANSI B16.10
●Flange ends: ANSI B16.5
●Test & Inspection: API 598
Design of Disc
Gate vlaves with NPS>2 are of flexible wedge gate;Gate valves with NPS <2 are of solid wedge gate.
Body and Bonnet Connection
The body and bonnet of Class 150~Class 900 gate valves are usually bolted bonnet design.And Class 1500~Class 2500 gate valves are usually of pressurized seal design.

Gasket of Cover Flange

Carbon steel or stainless steel+flexible graphite combined gasket is used for Class 150 gate valve;Stainless steel+flexible graphite wounded gasket is used for Class 300 gate valve;Stainless steel+flexible graphite wounded gasket is used for Class 600 gate valve ,and ring joint gasket is also optional for Class 600 gate valve;Ring Joint gasket is used for Class 900 gate valve;Pressurized seal design is used for Class 1500~Class 2500 gate valve.


Hand wheel or gear box is usually used for gate valve actuation .Chain wheel and electric actuator can be also used for gate valve actuatuo if being requested by the customers.
Back Seating Design
All our gate valves have the back seating design.In most cases,the carbon steel gate valve is fitted with a renewable back seat.For stainless steel gate valve,the back seat is machined directly in the bonnet or is machined after welding .When the gate valve is at fully open position ,the sealing of the back seat can be very reliable .However ,as per the requirement of API600,it is not advisable to add or change packing by the mean of back seating when the valve is pressure containing.
For carbon steel gate valve ,the seat is usually forged steel.The sealing surface of the seat is spray welded with hard alloy specified by the customer.Welded seat is used for NPS<10 gate valves ,and welded on seat can be also optional if being requested by the customer.Welded on seat is used for NPS<10 carbon steel gate valves .for Stainless steel gate valve,intergral seat is usually adopted,or to weld hard alloy directly integrally.Threaded or welded on seat is also optional for stainless steel gate valve if being requested by the customer.
Stem Design
The stem is of integral forged design .The minimum diameter of the stem shall per the standard requirement .The connection of the stem and disc is T type .The strength of the connecting area is bigger than that of the T threaded part of the stem .The strength test if that area conforms to API 591.
Stem Nut
Usually,the stem nut is made of ASTM A276 410.It is also can be made of copper alloy if being requested by the customer .For large sized gate valves (NPS 10 for Class 150,NPS 8 for Class 300,NPS 6 for Class 600,NPS 5 for Class 900),rolling bearing is fitted at the two sides of the stem nut in order to minimize the open and close torque of the gate valve.

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