Hf-Valves

Category: Gate Valve

  • Main cover connection methods for forged gate valve

    Main cover connection methods for forged gate valve

    There are three main types of cover connection methods for forged steel gate and globe valves. What are they and how to choose the best method. Today we are will introduce  some of main cover connection methods to help you better understand the secret of valves.

              1. Bolted:  The valve body is connected to the valve cover by bolts,  It offers:

    • Easy disassembly: Ideal for frequent maintenance and inspection.
    • Cost-effective: Simpler design and maintenance process.

    2. Welded: This method creates a permanent seal between the body and cover. It’s suitable for:

    • High-pressure applications: Ensures no leaks even under demanding conditions.
    • Safety-critical systems: Eliminates the risk of leakage in sensitive applications.

    3. Pressure-sealed: This design uses screws to hold the body and cover together, but the sealing is achieved by a compressible gasket that responds to internal pressure. It provides:

    • Balance between maintenance and sealing: Easier disassembly than welded, with good sealing performance.
    • Pressure-assisted sealing: Seal improves as internal pressure rises, beneficial for globe valves.

    The best choice for application will depend on factors like pressure rating, desired level of maintenance access, and budget：

    • Pressure Rating: For high pressures (as specified by the manufacturer), a welded connection is essential for safety and leak prevention. Bolted or pressure-sealed might not be sufficient.
    • Maintenance Needs:  bolted connection allows for easier disassembly if frequent maintenance required . For applications with minimal disassembly needs, welded or pressure-sealed is better.
    • Budget: Welded connections are generally more expensive due to complex manufacturing and specialized maintenance needs. Bolted connections are most cost-effective. Pressure-sealed falls somewhere in between.
    • Specific industries might have regulations regarding valve cover connections. Ensure your choice complies with any relevant standards. Larger valves might benefit from bolted connections for easier handling during maintenance. Consult the manufacturer’s specifications for their recommendations on the appropriate cover connection method based on the valve’s pressure rating and design
  • Forged Steel Gate Valve

    Forged Steel Gate Valve

    Product

    Forged Steel Gate Valve

    Specification

    Size: NPS3/4”-2”
    Class: 150Lb~2500Lb
    Working temperature: -29～500℃
    Design: API 602
    Connection: RF, SW, BW, RTJ
    Face to face: ASME B16.10
    Test: API 598
    NACE: NACE MR 0103 NACE MR 0175;

    Main Parts Material:

    Body

    A105

    A182 F22

    A182 F304(L)

    A182 F316(L)

    Seat

    A276 420

    A276 304

    A276 304(L)

    A276 316(L)

    Disc

    A182 F430&410

    A182 F304

    A182 F304(L)

    A182 F316(L)

    Stem

    A182 F6

    A182 F304

    A182 F304(L)

    A182 F316(L)

    Gland Packing

    A276 410

    A182 F304(L)

    A182 F316(L)

    Features:

    1. The channel is smooth and the flow coefficient is small. The sealing surface is less susceptible to medium erosion and erosion.
    2. The sealing surface is made of alloy steel or hard alloy, with good wear and scratch resistance.
    3. Adopting flexible graphite filler, reliable sealing, and easy and flexible operation.
    4. The flow direction of the medium is unrestricted, does not disturb flow, and does not reduce pressure.
    5. Filler replacement and maintenance can be carried out in an online shutdown state, which is convenient and fast without affecting system operation.
  • Knife Gate Valve

    Knife Gate Valve

    Product

    KNIFE GATE VALVE

    Knife gate valves are commonly used to connect or cut off cement slurry, pulp, wood pulp, slag, slag, cinder, slime, tailings, dust, fiber, chemical treatment sewage, sedimentation tank, asphalt, silo outlet, fruit, grain, slaughterhouse wastewater and other media in the pipeline. It is especially suitable for coal preparation, slag discharge, urban sewage treatment, food, papermaking, medicine, petroleum, chemical and other oil, water and steam pipelines of mining power plants.

    Knife gate valve is used in cement slurry, pulp, wood pulp, slag, slag, cinder, slime, tailings, dust, fiber, chemical treatment sewage, sedimentation tank, asphalt, silo outlet, fruit, grain, slaughterhouse wastewater and other media in the pipeline. It has a shear function in the gate plate, which can scrape the sticky matter on the sealing surface and actively remove debris. Stainless steel gates prevent seal leakage caused by corrosion.

    Specification

    Size: DN50-DN800

    Pressure: PN10-PN16

    Main material: WCB 、Ductile Iron、Stainless steel

    Valve seat: PTFE

    Connection: Wafer. Flange

    Operation: Handwheel,Electric,Penumatic

    Main Parts Material:

    Body

    Stem

    Sealing

    Packing

    		 

    WCB

    WCB

    2Cr13

    Hard-alloy, PTFE

    V-shape PTFE,Flexible graphite Rings

    SS304

    ZG1Cr18Ni9Ti

    0Cr18Ni9 (304)

    SS304

    SS304

    0Cr18Ni9 (304)

    Features

    1. The fluid resistance is small, and the sealing surface is less washed and eroded by the medium.
    2. Easyto open and close.
    3. The flow direction of the medium is not limited, and the pressure is not disturbed or reduced.
    4. Durable and simple to use.
    5. Simple shape, short structure length, wide range of application.
  • Cryogenic Gate Valve

    Cryogenic Gate Valve

    Product

    Cryogenic Gate Valve

    Cryogenic valves is designed in two different bonnet type. One is bolted bonnet, which the valve body and the bonnet are connected with a bolt nut, wound gasket (316 clamp flexible graphite manufacturing). Metal ring connections are also available upon special requirements. Another type is welded bonnet, which the valve body and the bonnet is threaded connected.

    Specification

    Size: DN15~800mm
    Pressure : PN1.6~2.5Mpa
    Main Material: LCB、LF1、 LF3、LC3、 CF8、 F304 ect.
    Suitable Temperature: -45°C~ 196°C
    Design: JB/T 7749-95
    Face to face : GB/T 12221-1989
    Test: JB/T 9092-1999

    Main Parts Material:

    Body/Bonnet

    Stem

    Seat

    Gasket

    Packing

    Medium

    LCB

    1Cr7Ni12

     

    STL/STL

    1Cr13/Flexible

    graphite

    Low-temperature asbestos

    PTFE

    Flexible graphite

    Propane/propene

    Methanol/ethane

    Gas/liquid ammonia

    LC1

    LC2

    LC3

    LC4

    Features:

    1. The fluid resistance is small, and the sealing surface is less affected by the brushing and erosion of the medium.
    2. Easy to open and close.
    3. The flow direction of the medium is not limited, no disturbance and no pressure reduction.
    4. Simple shape, short structure length, good manufacturing process, wide range of application.
    5. It is easy to cause erosion and abrasion between the sealing surfaces, and maintenance is more difficult.
    6. The appearance size is large, and a certain space is required for opening. Take long time to open and close.
    7. The structure is more complicated.
  • High Pressure Gate Valve

    High Pressure Gate Valve

    Product

    High Pressure Gate Valve

    Specification

    Size: NPS 2″~18″

    Pressure : Class1500/Class2000/Class2500/Class3500

    Main Material: WCB; WC1,WC6,WC9 CF8M, CF3M, CF3 ;LCB,LCC etc.

    Design: API600

    Test: API598

    BW: ASME B16.25

    FACE TO FACE: ASME B16.10

    Main Parts Material:

    BODY

    BODY.BONNET.GATE

    STEM

    PACKING

    WCB

    CF8

    CF8

    Flexible graphite

    WC6

    WC6

    38CrMoALA

    Flexible graphite

    ZG1Cr5Mo

    ZG1Cr5Mo

    38CrMoALA

    Flexible graphite

    CF8

    CF8

    F304

    Flexible graphite

    Features:

    1. Reasonable structure design, good performance, smooth channel and small flow coefficient
    2. The sealing surface is made of stainless steel and hard alloy, witha long service life.
    3. The use of flexible graphite filler, reliable sealing performance, light and flexible operation
  • Pressure Seal Gate Valve

    Pressure Seal Gate Valve

    Product

    Pressure Seal Gate Valve

    The pressure of the medium itself is used to achieve the purpose of sealing, the greater the pressure, the greater the sealing force generated, and the more reliable the seal. It is suitable for thermal power plants, petrochemical industry, metallurgy and other high temperature and high pressure water, steam, oil products, superheated steam pipelines.

    Specification

    Size: NPS 2″~24″
    Pressure : 900LB~2500LB
    Connection: RF, RTJ, BW
    Face to face: ASME B16.10
    Flange Dimension Standards：ASME B16..5
    Design ：API602, ASME 16.34, BS 5352, BS 6364
    Test: API598
    Operation: Handwhel, Worm Gear, Electric actuator, Pneumatic actuator, Hydraulic Actuator.

    Main Parts Material:

    Body

    WCB

    WC6

    CF8

    CF3

    Disc

    WCB

    WC6

    CF8

    CF3

    Stem

    F6a

    38CrMoALA

    F304

    F316

    Packing

    Packing

    Graphite

    Graphite

    Graphite

    Applicable medium:

    water, steam，other non-corrosive medium

    Features:

    1. The fluid resistance is small, and the sealing surface is less brushed and eroded by the medium.
    2. Easy to open and close.
    3. The flow direction of the medium is not limited, and the pressure is not disturbed or reduced.
    4. Simple shape, short structure length, good manufacturing process, wide range of application.
    5. Unique self-sealing design, the higher the pressure, the more reliable the sealing.
  • Stainless Steel Gate Valve

    Stainless Steel Gate Valve

    Product

    Stainless Steel Gate Valve

    Stainless steel is one of the most durable materials used in industrial valves, used to provide a tight shut-off in applications with extreme conditions. It is used to handle different types of medium, such as chemicals, corrosive and abrasive medium, slurries, and mixed solids. Because of its resilience, it is used in an array of industrial applications like oil and gas industry, chemical and pharmaceuticals, marine, water and wastewater treatment, and manufacturing industries.

    Specification

    Size: NPS 2″ ~32″
    Pressure: 150LB -900LB
    Connection: RF, RTJ, BW
    Face to face: ASME B16.10
    Flange Dimension Standards: ASME B16..5
    Design ：API602, ASME 16.34, BS 5352, BS 6364
    Test: API598
    Operation: Handwheel, Worm Gear, Electric actuator, Pneumatic actuator, Hydraulic Actuator.

    Main Parts Material:

    Part Name

    ZG1Cr18Ni9T
    i304 CF8

    ZGOOCr18Ni10
    304L CF3

    ZG1Cr18Ni12Mo
    2Ti316 CF8M

    zgoocR17nI14mO2
    316L CF3M

    WCB

    Body/Cap

    OCr18Ni9

    OOCr18Ni10

    OOCr18Ni9Mo2

    OOCr18Ni10Mo2

    WCB

    Stem

    OCr18Ni9

    OOCr18Ni10

    OOCr18Ni9Mo2

    OOCr18Ni10Mo2

    1Cr3

    Stem Packing

    PTFE

    PTFE

    PTFE

    PTFE

    Graphite

    Gasket

    304+PTFE

    304L+PTFE

    316+PTFE

    316L+PTFE

    Graphite+304

    Gland Flange

    OCr18Ni9

    OOCr18Ni10

    OOCr18Ni9Mo2

    OOCr18Ni10Mo2

    WCB

    Bolt

     Stainless Steel

    34GtMoA

    Nut

     Stainless Steel

    45

    Features:

    1. The sealing surface of the gate and seat is made of cemented carbide overlay welding of different hardness, which is well sealed and long in use;
    2. The valve stem is tempered and surface nitride, and has good corrosion resistance, scratch resistance and wear resistance;
    3. Flexible gate structure, medium and large diameter thrust bearings are set, the friction force is small, and it is equipped with a handwheel, easy to open and close.
    4. It can adopt piping flange standard and flange sealing surface form, which meets the engineering needs and user requirements.
  • Cast Steel Gate Valve

    Cast Steel Gate Valve

    Product

    Cast Steel Gate Valve

    Specification

    Size: NPS 2”~40”
    Pressure: 150LB~2500LB
    Connection: RF, RTJ, BW
    Face to face: ASME B16.10
    Flange Dimension Standards：ASME B16..5
    Design：API602, ASME 16.34, BS 5352, BS 6364
    Test: API598
    Operation: Handwhel, Worm Gear, Electric actuator, Pneumatic actuator, Hydraulic Actuator.

    Main Parts Material:

     

    Body

    ASTM A216 WCB

    ASTM A351 CF8

    Disc

    WCB

    CF8

    CF8M

    MONEL

     

    Stem

    F6

    F304

    F316

    MONEL

    F304

    Seat

    13Cr  13Cr STL

    304 STL

    316 STL

    MONEL

    304 304 STL

    Features:

    1. Compact structure, small size, good rigidity, safe and reliable .
    2. The closing element (gate) adopts an elastic structure, which can automatically compensate for valve body deformation caused by abnormal load or temperature during operation.withthe reliable sealing。
    3. For 150LB manual valves with a diameter large or equal to NPS10 “, and pressure 600LB-2500LB largeror equal to NPS6”, are equipped with rolling bearings in their operating devices for easy opening and closing.
    4. The main materials,trimand fasteners can be reasonably combined according to user requirements or actual working conditions.
    5. For valves≤ 10 “, the valve seat can be replaced.