Both sliding and swing type line blind valves are used for the same core purpose: positive isolation. In the closed position, a solid blind plate blocks the pipeline bore, giving operators a visible and mechanical isolation method before maintenance, inspection, shutdown work, or media changeover. The difference is not whether one can isolate and the other cannot. The real question is how the valve moves, how much space the site has, how often the line must be switched, and how difficult the operation will be under pressure, temperature, and site-access limits. A sliding type line blind valve moves the blind plate laterally. This design is often useful where side clearance is available but swing clearance is limited. A swing type line blind valve rotates the blind plate into or out of the flow path. It is often selected where fast, clear changeover is needed and the installation area allows the plate to swing. Selection Factor Sliding Type Line Blind Valve Swing Type Line Blind Valve Structure Blind plate slides sideways between open and closed positions Blind plate rotates or swings between open and closed positions Operation Often gear, hydraulic, pneumatic, or electric assisted for easier plate movement Manual, gear, hydraulic, pneumatic, or electric operation depending on size and class Maintenance Sliding tracks, sealing surfaces, and drive parts should be checked regularly Pivot, locking parts, sealing surfaces, and drive parts need inspection Space Requirement Usually better when swing radius is restricted, but needs side travel space Needs enough swing clearance around the pipeline Suitable Service Frequent switching, compact plant layout, limited swing area Clear operation path, quick changeover, maintenance isolation, oil, gas, steam, or chemical lines For compact plants, pipe racks, or areas with nearby equipment, sliding type designs may be easier to arrange. Their lateral movement can avoid the large arc required by a swing plate. This is one reason sliding line blinds are often considered when installation space is a serious constraint. Swing type designs are often preferred when the site has enough clearance and operators want a simple visual change between open and blind positions. For large sizes or higher pressure classes, the operation method becomes important. Gear, hydraulic, pneumatic, or electric operation can reduce manual effort and improve safety. When choosing between the two, start with the site layout. If the valve cannot physically move through its full travel, the design is wrong no matter how good the specification looks. Then check pressure class, medium, temperature, material, sealing type, switching frequency, and required test standard. For high-temperature steam, hot oil, gas, toxic media, or flammable service, do not select only by valve type. Confirm body material, blind plate material, seal material, operating torque, ...
An API 600 gate valve is a heavy-duty steel gate valve used for full-open or full-closed isolation in petroleum, natural gas, petrochemical, refinery, and power applications. A good RFQ should define size, pressure class, material, trim, end connection, operation method, testing, and documentation requirements. What Is an API 600 Gate Valve? An API 600 gate valve is a steel gate valve designed for demanding industrial service. It is commonly used where the valve must provide reliable isolation under pressure, temperature, and process conditions that require a more robust construction than light-duty valves. API 600 is specific to steel gate valves. It is commonly associated with bolted bonnet construction, outside screw and yoke design, rising stem operation, metallic seating surfaces, and flanged or butt-weld ends. The key point for buyers is simple: API 600 gate valves are intended for isolation, not throttling. They should normally be operated either fully open or fully closed. Key Design Features The design of an API 600 gate valve focuses on strength, sealing, and service reliability. Common design features include: ● Bolted bonnet construction ● Outside screw and yoke, or OS&Y design ● Rising stem ● Flexible wedge or solid wedge ● Metallic seating surfaces ● Renewable or welded-in seat rings, depending on design ● Flanged, RTJ, or butt-weld ends ● Handwheel, gearbox, or actuator operation A rising stem helps operators see whether the valve is open or closed. OS&Y construction also keeps stem threads outside the pressure boundary, which can support easier inspection and maintenance. For high-temperature or high-pressure service, the wedge, seat, gasket, packing, and bolting materials must be checked carefully. A valve can meet the general standard but still be unsuitable if the material or trim is wrong for the media. Common Materials for API 600 Gate Valves Material selection should match the process medium, operating temperature, corrosion risk, and pressure class. Common body and bonnet materials include: Material Typical Use ASTM A216 WCB General carbon steel service ASTM A217 WC6 / WC9 High-temperature alloy steel service ASTM A352 LCB / LCC Low-temperature service ASTM A351 CF8 / CF8M Stainless steel or corrosive service Duplex stainless steel Corrosion or chloride-containing service Trim selection is equally important. The stem, wedge, seat, and hardfacing should be compatible with temperature, media, and leakage requirements. For refinery, steam, or petrochemical service, buyers often need to check trim number, seat hardfacing, graphite packing, gasket type, and bolting grade. API 600 vs API 602 API 600 and API 602 are often compared, but they are not the same. API 600 applies to steel gate valves, typically used for larger and heavier-duty process applications. API 602 applies to compact forged gate, globe, and check valves, usually in smaller sizes...
An API 602 forged gate valve is used for compact, small-bore gate valve service in petroleum, natural gas, chemical, power, and industrial piping. To specify the right design, confirm size, pressure class, material, bonnet type, end connection, port type, trim, seat, testing standard, and service conditions. What Is an API 602 Forged Gate Valve? An API 602 forged gate valve is a compact steel gate valve manufactured to API 602 requirements. API 602 covers gate, globe, and check valves for sizes DN 100 / NPS 4 and smaller in petroleum and natural gas industry applications. Unlike large cast steel gate valves, forged gate valves are usually selected for smaller piping systems where pressure, temperature, vibration, or compact installation matters. Forged construction provides a dense material structure, which is useful for high-pressure and critical service. In simple terms, API 602 is often the better fit when the line is small but the service is demanding. When Should You Use an API 602 Forged Gate Valve? Use an API 602 forged gate valve when the application requires reliable isolation in a compact piping system. It is commonly used in refineries, chemical plants, power plants, oil and gas facilities, steam lines, vents, drains, and utility systems. Typical use cases include: ● Small-bore high-pressure lines ● Steam and condensate service ● Process isolation ● Skid-mounted systems ● Drain and vent connections ● Instrument and auxiliary piping ● Oil, gas, and petrochemical service For larger line sizes or heavy-duty cast steel applications, API 600 may be more appropriate. API 602 and API 600 should not be treated as interchangeable standards. Key Design Choices to Specify Do not specify an API 602 forged gate valve only by size and pressure class. The purchase requirement should define the full valve design. Important items include: Item What to Confirm Size DN / NPS size and bore requirement Pressure class Class 800, 1500, 2500, or project requirement Material A105, F304, F316, F11, F22, LF2, or other grade Bonnet type Bolted bonnet, welded bonnet, or pressure seal End connection Socket weld, threaded, butt weld, or flanged Port Full port or regular port Trim Stem, wedge, seat, and hardfacing material Operation Handwheel, gearbox, or actuator if required Testing API 598 or project-specified testing These details affect sealing, pressure capability, maintainability, and installation. Bonnet and End Connection Selection Bonnet type should match pressure, temperature, and maintenance needs. Bolted bonnet designs are common and easier to service. Welded bonnet designs reduce potential leakage paths but are less convenient to disassemble. Pressure seal bonnets may be considered for higher-pressure service, depending on the design and project requirement. End connection is equally important. Socket weld ends are common for small-bore forged valves. Threaded ends may be...
10" 150LB line blind valve is made according to ASME B16.34 standard. The valve body is made of A105. It has the structural characteristics of anti-drip. Its connection mode is RF. And it has turbine operation mode.
Payment:
30% when order confirmed, 70% before shipmentProduct Origin:
ChinaColor:
CustomizationShipping Port:
Shanghai, ChinaLead Time:
30~60 days Ex Works after order confirmationMaterial:
A105Method of Operation:
Turbine Operation
|
Type |
Line Blind Valve |
|
Size |
10" |
|
Pressure |
150LB |
|
Connection |
RF |
|
Operation |
Turbine Operation |
|
Body Material |
A105 |
|
Design Norm |
ASME B16.34 |
|
Face to Face Dimension |
Manufacturer Standard |
|
Flange Dimension |
ASME B16.5 |
|
Test & Inspection Code |
API 598 |
|
Temperature |
-29 ~ 150°C |
|
Applicable Medium |
Water, Oil and Gas |
1. Equipped with quick opening and closing function, no additional disassembly or installation of pipe fittings is required, reducing operation time and worker workload;
2. Suitable for various media, including gases, liquids, slurries, and particulate matter, widely used in industries such as petrochemicals, metallurgy, and power.
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Line blind valve (eyeglass valve) is a kind of gate valve that cuts off gas medium manually, electrically or pneumatically or hydraulically. It is generally divided into electric blind valve, hydraulic blind valve, closed plug valve and electric open blind valve.
Line blinds are utilized in pipeline systems when there is a need for either complete closure or unimpeded flow transition without a significant drop in pressure. The THD (Through-Hole Design) enables swift and seamless adjustments in position. The THD-slide variant boasts a multi-bolt configuration, making it easier to operate with reduced face-to-face dimensions. The inclusion of extra body bolts renders this style particularly well-suited for high-pressure applications.
This DN400 PN40 forged slide blind valve provides positive isolation for steam pipelines and high-temperature industrial systems—physically blocking flow with a solid blind plate to ensure zero leakage during maintenance. Unlike conventional valves that rely on seats that can wear or degrade, this blind valve creates an absolute physical barrier, protecting personnel and preventing costly shutdowns. The sliding blind mechanism enables operators to switch between flow and isolation positions without depressurizing the line, significantly reducing downtime. Constructed from a one-piece forged A182 LF2 steel body, it delivers exceptional low-temperature toughness (down to -46°C) and reliable performance under PN40 pressure and high-temperature steam service up to 350°C. Designed to EN12516-1/2 and 100% pressure tested to EN12266-1/2, this valve features RF flanges per GOST 33259-Type B and a gear operator for smooth, high-torque actuation on large-diameter lines. It is a trusted choice for refineries, power plants, and industrial pipeline isolation where safety and reliability are paramount. Product Parameters Type Slide Blind Valve Size DN400 Pressure PN40 Connection RF Operation GEAR Body Material A182 LF2 Design Norm EN12516-1/2 Face to face Supplier Standards Flange dimension GOST 33259-Type B Test & Inspection Code EN12266-1/2 Temperature -46 ~ 350°C Applicable Medium Water, Oil and Gas Features • True Physical Barrier – Zero Leakage Isolation– Solid blind plate creates a true physical barrier. The one-piece forged LF2 body eliminates weld seams, ensuring structural integrity under PN40 pressure and thermal cycling. • Inline Operation Without Depressurization – Sliding mechanism enables switching without system blowdown. LF2 steel ensures reliable operation down to -46°C, ideal for cold climates and cryogenic steam conditions. • Gear-Operated for Large Diameters – High-torque gearbox ensures smooth and controlled operation for DN400 valves, even under demanding conditions. • Low-Temperature Toughness – ASTM A182 LF2 forged steel ensures reliable operation down to -46°C, ideal for cold climates and cryogenic steam conditions. Sliding Type Line Blind Valve Technical Drawing Dimension Checking Pressure Testing Painting Nameplate & Packing Inspection Report
This 10-inch Class 150 Sliding Line Blind Valve provides absolute positive isolation for steam turbine pipelines and high-temperature industrial systems. Unlike conventional gate or ball valves that rely on seats subject to wear, the sliding blind mechanism creates a solid physical barrier—delivering zero leakage during maintenance and ensuring personnel safety. The gear-operated sliding plate allows operators to switch between flow and isolation positions without depressurizing the line, significantly reducing downtime. The drip-proof design prevents fugitive emissions, making it ideal for steam, oil, gas, and other critical services. Constructed from ASTM A105 forged carbon steel with RF flanges per ASME B16.5, the valve is designed to ASME B16.34 and tested to API 598. It offers reliable performance in applications up to 425°C (sealing dependent), combining durability, safety, and ease of operation. Product Parameters Type Sliding Blind Valve Size 10” Pressure 150LB Connection RF Operation Turbine Body Material A105 Design Norm ASME B16.34 Face to face Manufacturer Standard Flange dimension ASME B16.5 Test & Inspection Code API 598 Temperature -29 ~ 150°C (Higher temperature up to 425°C available with metal seat) Applicable Medium Water, Oil and Gas Features • Forged A105 Carbon Steel Body – Provides strength and durability for reliable performance in industrial pipeline service. • Drip-Proof Design – Prevents fugitive emissions and protects internal components, making it ideal for environmentally sensitive applications and steam turbine systems. • Absolute Physical Isolation – Solid blind plate provides true physical separation of the pipeline, ensuring safe maintenance without relying on sealing surfaces. • Online Switching – No Depressurization Required – Sliding mechanism allows switching between open and blind positions without pipeline blowdown, reducing downtime and media loss. • Gear-Operated for Large Diameters – High-torque turbine drive enables smooth and controlled operation for large valves, even under demanding conditions. Slide Type Line Blind Valve Technical Drawing Dimension Checking Pressure Testing Painting Nameplate & Packing Inspection Report
Introduction This 10" Class 300 Sliding Line Blind Valve provides absolute positive isolation for medium‑ to high‑pressure pipelines, combining the reliability of a solid physical barrier with the simplicity of manual screw‑operated actuation. Unlike conventional valves that rely on seats prone to wear, the sliding blind mechanism creates a true physical barrier, ensuring zero leakage during maintenance without the need for system depressurization. This significantly reduces downtime and enhances personnel safety. The manual screw‑operated design offers precise, controlled movement of the blind plate, with inherent self‑locking capability to maintain position under pressure—ideal for applications where electric or pneumatic power may not be available or preferred. Constructed to ASME B16.34 with RF flanges per ASME B16.5, this valve is available in forged carbon steel (A105), stainless steel, or alloy materials to suit your service conditions. Each unit is 100% pressure tested to API 598. This 10" Class 300 configuration is a popular choice for steam, oil, gas, and chemical pipelines. Other sizes from 1" to 60" and pressure classes up to Class 2500 are available as part of our full line blind valve series. THD-Slide Cutout Features 1.Manual Screw‑Operated with Self‑Locking Precision screw drive allows smooth, controlled positioning of the blind plate. The self‑locking mechanism maintains position under pressure without additional braking devices. 2.Absolute Physical Isolation Solid blind plate creates a true barrier, ensuring zero leakage during maintenance—unlike seat‑dependent valves that can wear or degrade over time. 3.Inline Operation Without Depressurization Sliding mechanism enables switching between flow and blind positions without system blowdown, reducing downtime and product loss. 4.10″ Class 300 – The Optimal Balance Offers higher pressure capability than Class 150 while remaining more economical than Class 600, making it a versatile choice for a wide range of industrial applications. 5.Forged Carbon Steel Construction A105 forged body provides high strength, impact resistance, and reliable performance under thermal cycling. 6.Tested to API 598 100% hydrostatic and pneumatic testing ensures leak‑tight performance before shipment. Standard Specifications Parameter Specification Type Sliding Line Blind Valve Size 10″ (DN250) Pressure Rating Class 300 (PN50) Connection RF Flange, ASME B16.5 Operation Manual Screw-Operated (Self-locking) Body Material A105 Forged Carbon Steel (other alloys available) Seal / Seat Material Metal-to-Metal (Stainless Steel + Graphite) Design Standard ASME B16.34 Face-to-Face Dimension Per ASME B16.10 or manufacturer standard Test & Inspection API 598 (100% hydrostatic & pneumatic) Temperature Range -29°C to +425°C (depending on sealing) Applicable Media Steam, Oil, Gas, Water, Hydrocarbons Application Pipeline isolation, refineries, petrochemical plants, power generation Technical Drawing Flexible Design Options Tailored Configurations for Demanding Applications Beyond the base model, this line blind valve can be customized for high-temperature service, fire-safe requirements, and zero-emission (drip-proof) operation. For installations where space is at a premium, a compact variant is available, offering the same robust isolation performance in a reduced footprint. Simplified Seal Maintenance– No Disassembly Required Seals are integrated into the spectacle plate, allowing operators to inspect or replace them without dismantling the valve. Condition checks can be performed while the valve remains in service, before any position change, ensuring seal integrity is verified before operation. Low Total Cost of Ownership The valve’s streamlined, heavy‑duty construction delivers reliable positive shut‑off with minimal upkeep. Its unique actuation mechanism allows a single operator to quickly and safely isolate the pipeline—no tools required—reducing labor time and simplifying maintenance procedures. Options ●Hand Wheel Extensions ●Locking Device ●Limit Switches ●Drain/Vent ports ●Spectacle Plate Covers to Protect Seals ●Compact Design (integral tapped end flange) ●Rain/Dust Shield ●Torque Limiter
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