Ansi Gate Valve

Design and Manufacture:Cast steel gate valve to API
600(ISO 10434)or API 6D:Cast stainless steel gate valve
to API 603 or API 600:Forged steel gate valve to API602
lnspection and Test:API 598,API600 or AI6D
End flange dimension:ASME B16.5 (for NPS≤24)
ASM B16.47 series B、API605 or ASME B16.47 series A、MSS SP-44(for NPS＞24)
BW end dimension:ASME B16.25
Socket-weld dimension: ASME B16.11
Face to face and end to end:ASME B16.10
Pressure-temperature ratings:ASME B16.34

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 Class300 gate valve;Stainless steel+flexible graphite wounded gasket is used for Class600 gate valve,and ring joint gasket is also optional for Class600 gate valve;Ring Joint gasket is used for Class900 gate valve,Pressureized seal design is used for Class1500-Class500 gate valve;

Body and Bonnet Connection

The body and bonnet of Class150-Class900 gate valves are usually connected with studs and nuts.Aand The body and bonnet of Class 1500-Class2500 gate valves are usually of pressureized seal design.

Belleville Spring Loaded Packing lmpacting System

lf being requested by the customer,the Belleville spring loaded packing impacting system can be a do pted for enhancing the durability and reliability of the packing seal.

Packing Seal

Molded flexible graphite is used for packing material,PTFE or combined packing material can be also Lised if being requested by the customer.The internal suface of the stuffing box,of which area is contacted with the packing,is of excellent finish (Ra3.2μm).The stem surface,contacting with the packing,should be rolled and pressed after being precisely machined,so as to reach to the high finish and compactness (Ra0.8μm)and ensure the reliable tightness of the stem area.

Actuation

Hand wheel or gear box is usually used for gate valve actuation,Chain wheel and electric actuator can be also used for gate valve actuation if being requested by the customers.

Back Seating Design

All our gate valves have the back seating design.ln 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 atfer welding.Welding.When the gate valve is at fully open position ,the sealing of the back seat can be very reliable,However,asp per the requirement of API 600,it is not advisable to add or change packing by the mean of back seating wen the valve is res sure containing

Design of Disc

Gate valves wiht NPS≥2 are of wedge flexible gate;
Gate valves with NPS＜2 are of wedge solid gate.

Stem Design

the stem is of integral for ged design,The minimum diameter of the stem shall per the standared 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 of that area conforms to API 598.

Seat

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,Renewable threaded 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,integral seat is usually adopted,or to weld hard alloy directly integrally.Threaded or welded on s-eat is also optional for stainless steel gate valve if being requested by the customer.

Special Gate Valve

Besides the common gate valves,Baiqiang also makes cryogenic gate valve,Jacketed Gate valve,Bellow Sealed Gate Valve,Extension Stem Gate Valve for underground application,Falt Gate Valve,etc

Stem Nut

Usually,the stem nut is made of ASTM A439 D2 it is also can be made of copper ally if being requested by the customer.For large sized gate valves (NPS10 for Class 150,NPS 8 for Class300,NPS 6 for Class 600,NPS 5 for Class900),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.

· Administer Standard

· Pressure Test

· Main Part Materials and Property

·Size Main Dimensions

·Size Main Dimensions

·Size Main Dimensions

Size  Main Dimensions