Product detail:
As the name suggests, a knife gate valve features a blade-shaped
diagonal incision at the bottom of the flat gate plate, which has
the function
of cutting off the medium, ensuring that the valve can close
without being blocked by the medium. This type of valve is
generally used for
opening/closing the flow of media such as pulp, coal ash, chemical
raw materials, sewage, and food. The opening/closing component of a
knife gate valve is the gate plate, whose movement direction is
perpendicular to the fluid direction. Knife gate valves can only be
fully opened
or fully closed, and cannot be used for regulation or throttling.
This valve is easy to operate, allows free opening, and features
flexible and
reliable movement; the gate plate is simple to assemble and
maintain, the sealing structure is reasonable, and the sealing ring
is convenient
and practical to replace. The gate plate of the knife gate valve
has a shearing function, which can scrape off adhesions on the
sealing surface
and automatically remove debris. The stainless steel gate plate can
prevent sealing leakage caused by corrosion.
Product technical parameter:
Port size | DN50-DN1200 |
Pressure nominal | PN1.0～1.6(MPa); 150LB; 10K |
Connection way | Wafer and flange |
Driven method | Electric actuator |
Power supply | AC380V |
Control way | ON/OFF function and regulating function |
Working pressure | DN50～DN250: 10 bars DN300～DN400: 6 bars DN450: 5 bars DN500～DN650: 4 bars
DN700～DN1000: 2 bars |
Flange connection | GB9113.1-2000；JB/T79.1-1984；HG20592-1997；ASME B 16.5；EN 1092-1:2001 |
Length standard | GB／T15188.2-94; MSS SP 81-2001 |
Pressure standard | GB/T12224-2007;ANME B 16.34-2003；ISO7005-1 |
Test standard | Strength and sealing standard: JB/T9092-1999
Metal seal standard:MSS SP 91-2001 40ml/inch
NBR, EPDM, and PTFE valve seats shall be according to the 1/10
leakage standard of hard sealing |
Working temperature | Seat | NBR≤80℃; EPDM≤120℃; PTFE≤180℃; Stainless steel hard alloy≤450-900℃ |
Body | WCB≤425℃; Stainless steel, chromium molybdenum steel≤600℃; 2520 duplex stainless steel ≤900℃ |
Medium application | coal selection, slag discharge, urban sewage treatment, food, paper-making, medicine, petroleum, chemical and other oil, water, and
steam pipelines in mining power plants, connecting or cutting off
cement slurry, gold powder, sand, slag, coal slurry, pulp, wood
pulp, tailing, fibers, dust, chemical treatment sewage,
sedimentation tank, asphalt, silo outlet, fruit juice, grains,
slaughterhouse wastewater etc. |
Product features:
1. The valve body adopts an integral design, with low fluid
resistance and flexible and convenient operation.
2. The screw drive adopts a double plane bearing design, which
greatly reduces the transmission friction and facilitates the
opening and closing of the valve.
3. The sealing valve seat of the knife gate valve adopts a movable
seal, and an O-ring pre tightening provides pre tightening force to
make the sealing valve seat tightly adhere to the valve plate,
greatly reducing leakage. It has an automatic compensation function
for the wear of the sealing pair in long-term use, improving the
service life of the valve.
4. Fixed guide claw, no groove design, not easy to cause medium
accumulation and jamming.
5. The valve seat can be selected as a metal hard seal or a soft
seal according to the needs of the medium and industry. The gate
plate is treated with hard chromium plating or ion nitriding on the
surface, making it more wear-resistant and enhancing the service
life of the sealing surface; Soft sealing valve seats can be
selected from PTFE, NBR, or EPDM, with good sealing performance and
corrosion resistance.
