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Check Valve
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Check valve is also known as one-way valve or non-return valve. It's a kind of valve with opening and closing part opens and closes automatically driven by flow and force of medium to prevent backflow of medium. Check valve is automatic valve, and mainly applied on pipeline with medium flows in one direction. The medium is allowed to flow only in one direction to prevent accident. BTL mainly manufactures four types of check valve: swing check valve, lifting check valve, tilting disc check valve and wafer check valve.
API 6D/BS 1868 Swing Check Valve
API 6D/BS 1868 Swing Check Valve
1. As the channel within the valve is in streamline form, the flow resistance is smaller than lifting check valve, it's suitable for low flow large-caliber application without frequently change in flow. However, it's not suitable for pulsating flow for sealing performance poorer than lifting check valve. 2. Swing check valve is suitable for various operating conditions of pipeline for petroleum, chemical, pharmaceutical, chemical fertilizer and electric power industry. 3. Swing check valve is suitable for clean medium like water, oi..
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API 594 Check Valve
API 594 Check Valve
The butterfly plate of API 594 double-clack check valve is two semicircular. The check valve uses spring-loaded valve clack which hanged on the center vertical pin shaft. When the valve is open, the resultant force of fluid is on the center of sealing face of valve clack, while the point of action of counter spring support force is on the center of valve clack surface so that the root of valve clack opens firstly. It avoids wearing of sealing face of old conventional valve when valve opens, and increase the persistence of valve seal. ..
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