Ductile iron bidirectional knife gate valve is one kind of gate valve, is a straight-stroke cut-off industrial valve. The head of the valve plate of the bidirectional sealing knife gate valve has an oblique sharp cutting edge, which has a certain cutting effect to the medium. Ductile iron bidirectional sealing knife type gate valve is suitable for media containing fibers and solid particles and sewage treatment systems. Bidirectional sealed knife gate valves can be operated by manual hand wheel, electric actuator, pneumatic cylinder, are widely used in automatic control systems of industries like paper making, mining, chemical industry and sewage treatment.
Introduction about ductile iron bidirectional sealing knife gate valve
Design standard: MSS SP-81
Standard for flange end: ASME B 16.5.
Valve body material: GGG40/Ductile cast iron(DI) /cast iron(CI)
Valve plate material: SS 304
Valve shaft material: 2Cr13
Valve seat material: Natural rubber(NR)
Sealing structure: Bidirectional soft sealing
Leakage grade: Zero Leakage.
Working temperature: ≤100℃
Applicable medium: pulp, sewage(waste water), coal slurry,fiber, ash, cement mixture,etc
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Advantages of ductile iron bidirectional sealed knife gate valve
- This soft sealing bidirectional knife edge gate valve adopts integral design, which has small fluid resistance and is flexible and convenient for operation.
- The screw drive of the manual hand wheel bidirectional knife gate valve adopts a double plane bearing design, which greatly reduces the transmission friction, so that the DI bidirectional knife blade gate valve can be opened easily and smoothly.
- The sealing seat of the resilient seated bidirectional knife type gate valve adopts a movable sealing structure, and an O-ring is used to pre-tighten to provide a pre-tightening force so that the sealing seat of the knife gate valve is close to the valve disc, the leakage of the bidirectional knife gate valve is greatly reduced, and it also has the automatic compensation function for the wear of the sealing pair during long-term use, which also improves the service life of the ductile cast iron resilient seated bi-directional sealing knife gate valve.
- There is no grooves inside the bidirectional knife gate valve, and it is not easy to cause the accumulation or jamming of the medium.
- The valve seat of the DI bidirectional knife blade gate valve can choose metal hard sealing material or resilient soft sealing material according to the needs of the medium and working conditions. The surface of the valve plate of the bidirectional knife gate valve can be chrome-plated or ion nitrided, which makes the valve plate more wear-resistant and the sealing surface of the knife gate valve will have a longer service life. The resilient soft sealing material can choose the PTFE valve seat, or reinforced PTFE valve seat, EPDM seat, NBR resilient soft sealing valve seat material, which has great sealing effect and is corrosion resistant.
- Ductile cast iron bidirectional soft sealing knife gate valve can be used for various medias, due to its great sealing performance and affordable price. That DI bi-directional knife gate valve can be driven by manual device, pneumatic cylinder, electric actuator, hydraulic actuator, which can make that type of knife gate valve have a widely application range.
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