Double seated globe valve Description
Double Seat Globe Valve is a globe valve that achieves bidirectional sealing through an upper and lower double valve seat structure. The two ends of the valve core cooperate with two valve seats respectively, and can simultaneously control the on-off of two flow channels.
Double seated globe valve specification
Production standards:
Design specifications: Follow GB/T 12235 (national standard steel stop valve), API 6D (general requirements for pipeline valves), ASME B16.34 (American standard pressure boundary design);
Material requirements: The valve body is made of forged steel (ASTM A105) or cast steel (A216 WCB), and the sealing surface is welded with hard alloy (such as Stellite 6) to improve wear resistance.
Testing requirements:
Bidirectional sealing test: Bidirectional high-pressure air tightness test is carried out according to API 598, and the leakage rate is ≤0.01%×DN;
Pressure balance verification: The operating stability of the valve core under the maximum pressure difference is verified by ISO 5208 (≥10,000 opening and closing cycles);
Corrosion resistance test: For chemical media scenarios, it is necessary to pass the NACE MR0175 sulfide stress corrosion cracking test.
Double seated globe valve
Application and core value
Chemical and petrochemical :
Scenario: Cutting off pipelines of highly corrosive media (such as sulfuric acid and liquid alkali);
Function: The double seal structure reduces the risk of leakage, and the corrosion-resistant materials (such as 316L+Hastelloy) extend the service life.
Nuclear power and thermal power :
Scenario: High-temperature and high-pressure steam system (≤570℃), feed water circulation control;
Function: The balanced valve core reduces the operating torque and adapts to the frequent opening and closing requirements.
Pharmaceutical and food :
Scenario: Aseptic fluid pipelines, CIP cleaning systems;
Function: The detachable valve body design facilitates online cleaning and meets FDA/EMA hygiene certification requirements
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