Highlight: Electric knife gate valve
Product introduction:
Electric knife gate valve—also known as knife type gate valve or
knife type slurry valve. It has evolved from coal washing,
gangue discharge, and slag discharge in mining power plants to
urban sewage treatment, and from general industrial
pipelines to professional pipeline systems in food, hygiene, and
pharmaceuticals. The ultra-thin electric knife gate valve
thoroughly solves the problems of large flow resistance, heavy
weight, difficult installation, and large footprint associated
with conventional gate valves, slab gate valves, globe valves,
control valves, butterfly valves, etc., thanks to its advantages of
small size, low flow resistance, light weight, easy installation,
and easy disassembly. Since the emergence of knife gate valves,
a large number of general-purpose on-off valves and control valves
have been replaced by them. Our company's PZ-type
electric knife gate valve incorporates advanced technologies and
structural advantages from domestic and international
sources, eliminating the shortcomings of electric knife gate valves
produced by other manufacturers during use. It features
light weight, simple and compact structure, reliable sealing
performance, long service life, and the ability to cut off media.
Its
sealing principle is as follows: when the gate closes completely,
the inclined surface of the gate contacts a wedge block on
the valve body, causing the gate to press tightly against the
sealing surface for a sealing effect. Additionally, the inclined
surface at the bottom of the gate has a medium-cutting function,
making the valve less prone to blockage and jamming
by media. The structure can be designed with hard-sealing or
soft-sealing options, allowing users to select the type based
on their sealing requirements. Due to the use of a knife-type gate,
it has excellent shearing performance, making it most
suitable for difficult-to-control fluids such as slurries, powdery
granular materials, and fibers. It is widely used in industries
such as papermaking, petrochemicals, mining, drainage, and food
processing. Multiple valve seats are available for selection,
and electric or pneumatic actuators can be equipped according to
on-site control needs to achieve automated valve
operation.
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.
