API Cast Steel Gate Valve

API terasest valuklapp on projekteeritud ja valmistatud vastavalt Ameerika Naftainstituudi (API) standardventiilidele, mida kasutatakse peamiselt nafta-, maagaasi-, keemia- ja muudes kõrge rõhu, kõrge temperatuuri või korrosiivsete ainete torustikusüsteemides, millel on kõrge tihendus, pikk kasutusiga ja tugev rõhukindlus. Selle põhikonstruktsioon järgib API 600 (süsinikterasest / legeeritud terasest ventiilide standard) ja API 6D (torujuhtmete ventiilide standard).

Structure

Valve body and sealing assembly:

• Valve body material: carbon steel (ASTM A216 WCB) or low alloy steel, part of the high temperature and high pressure scenes using stainless steel or carbide surfacing sealing surface.
• Gate and seat: wedge-type resilient gate structure, sealing surface using Stellite (Stellite) cobalt-based cemented carbide surfacing, wear-resistant, corrosion-resistant.
• Valve stem: tempering treatment + surface nitriding, strong anti-scratch, some large-diameter models are equipped with rolling bearings to reduce the opening and closing torque.

Connection and auxiliary structure:

• Flange connection: conforms to ANSI or GB/T9113 standard, easy to install and seal.
• Inverted seal design: stainless steel threaded seal seat or body overlay welded austenitic stainless steel, support online replacement of packing.

Specification

Nominal diameter (DN): DN50～DN1200 (common range), full bore design.
Pressure Rating:

• American Standard: Class150, 300, 600, 900, 1500, 2500 (up to 42MPa).
• European standard: PN16～PN420.
• Structural length: in accordance with GB/T12221 or API 600 standards, the specific size is adjusted according to the through diameter and pressure level.

 

GNEE API Cast Steel Gate Valve

 

Features and Benefits

• High sealing: double sealing surface (carbide + elastic compensation) to achieve zero leakage, suitable for vacuum or high pressure system.
• Wear-resistant and long life: alloy sealing surface is resistant to particulate media scouring, life expectancy is more than 50% higher than ordinary gate valves.
• Lightweight operation: open stem/concealed stem structure is optional, medium and large diameter models are equipped with rolling bearings, opening and closing torque is reduced by 30%.

Strong adaptability:

• Temperature range: -29 ℃ ~ 550 ℃ (low-temperature carbon steel material can be extended to -196 ℃).
• Media compatibility: water, steam, oil, natural gas, sulphur-containing oil and gas, etc.

Applications

• Oil & Gas:

Long-distance pipeline cut-offs, oil well gas recovery systems, control of sulphur-containing natural gas.

• Chemical & Power:

High temperature steam pipeline, corrosive acid and alkali media transport, coal dust and ash treatment.

• Metallurgy & Municipal:

High temperature molten metal control, sewage treatment system.

• Standardisation and Reliability: API standards ensure that valve design, materials and testing meet the requirements of severe service conditions, reducing the risk of failure.
• Economy:

Full bore design reduces fluid resistance and lowers pumping energy consumption.
Low maintenance costs (inverted seal structure to support online repair).

• Safety: Fire, explosion and anti-static design meets the standards of high-risk environments (e.g. API 607).

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