What is a knife gate valve?

Knife gate valve has special design for low leakage in corrosive conditions, standard Jis, BS, ANSI, DIN cast iron material, stainless steel, steel made in Taiwan, Korea, China good quality, cheap price, 12-18 months warranty.

Knife gate valve

Knife gate valve concept

First of all, let's find out what the gate valve is

Gate valve (English name Gate Valve) is a device installed on a pipeline with the basic task of opening and closing the fluid flowing through a certain position, operating by raising or lowering the valve up and down as trapdoor so the name gate valve comes from here. Valves are widely used in all applications but most commonly in the water supply and drainage industry. When the valve is fully open, the liquid will flow completely, without affecting the flow or pressure of the pipeline.
Knife gate valve, commonly known as knife valve (English name is Knife Gate Vavle) is a knife gate valve with a small horizontal structure, shorter than other gate valves used to open and close fluids in small spaces. about area.
The knife gate valve is a two-way valve designed for general industrial service applications. The design of the valve body and disc ensures that the flow of the fluid with suspended solids is not blocked.
Knife valve is made from many different materials such as stainless steel knife valve, cast iron knife gate valve, steel knife gate valve… The valve can be operated manually or by pneumatic (Pneumatic cylinder knife valve) or by electricity ( electrically controlled knife valve),...
Knife gate valves are specially designed for low leakage under corrosive conditions. Valve frames, doors, shafts and latches are all stainless steel grade 304 and 316 depending on the application required. The gasket guide side optimizes a high-molecular-weight polymer structure and pulverizes to hold the slide and form a watertight seal. The polymer forms a self-cleaning surface with a low coefficient of roughness and pressure loss, ensuring smooth operation.

Features of knife gate valve

The length of the valve is quite short, thus minimizing the weight of the valve
The valve disc is thinner, so it can be used in liquid mud, wood chips, wood pulp, and cement.
Takes up less space on the pipeline and effectively enhances the pipe durability, reducing vibration.
The valve disc is made of stainless steel, effectively preventing leakage caused by fluid corrosion.
Cast iron and stainless steel materials used in clean water environment are safe for users
Investment cost is cheaper than normal gate valve line but bring high efficiency as gate valve line of the same type and design material.

Application of knife gate valve

Application of knife gate valve in today's industrial system

• Water treatment plants used in narrow spaces need knife gate valves to make opening and closing more convenient
• Wastewater plant: There is garbage, mud and impurities, opening and closing is more difficult, so it is much easier to use a convenient gate valve compared to current gate and butterfly valves.
• Low water level tanks often have mud and sediment, so the use of knife gate valves is very accurate
• Used in hydroelectric plants
• Used in cement factories, silo tanks...
• Used in paper mill: Knife gate valve is thinner than normal gate valve, so it works very efficiently
• Chemical plants…v v.

Image of knife gate valve

Technical parameters, structure of knife gate valve

Specifications of knife gate valve

• Valve body material: Epoxy coated cast iron, steel, stainless steel
• Valve disc material: 304 . stainless steel
• Gasket Material: Teflon (PTFE), EPDM
• Handwheel: Cast iron, steel, stainless steel
• Drive type: Crank, pneumatic cylinder, electric motor
• Working pressure: PN10 ~ PN16
• Working temperature: 80 ~ 200ºC
• Connection: Clamp, Flange
• Flange standard: JIS, BS, DIN, ANSI
• Size: 50A ~ 1500A
• Item Status: Available
• Origin: Spain, Korea,  Taiwan, China.
• Warranty: 12-18 Month.
• Nationwide Delivery

Structure of knife gate valve

Gate valve knife is composed of the following parts: valve body, valve disc, valve shaft, transmission part

Valve body: The valve body is the main part of the valve. Knife valve body is made from materials such as steel, cast iron, stainless steel to withstand high pressure.
Knife valve body is made thinner than conventional gate valves in thickness so that it can be installed in small areas. Knife gate valves are connected to the pipeline through a flange clamp connection type or a conventional flange type
Currently, we are providing flanged knife valves according to BS or JIS standards for customers to choose
Valve disc (valve): The valve disc is the part that opens and closes the valve. The valve disc is made of 304, 316 stainless steel to help it operate reliably in many different environments
The valve disc is also thinly constructed to fit the valve body. Therefore, the knife valve disc can work very well in high viscosity media such as liquid slurry, stone powder, pulp... it cuts through the fluid very easily.
Valve shaft: The part that connects the valve disc and the drive handwheel. The valve shaft is made of high temperature and bearing steel
The valve shaft helps to transmit the movement from the handwheel down to the valve disc, helping the valve disc to rise and fall according to the movement of the handwheel.
Handwheel: A moving part that helps open and close the valve. The handwheel is designed in a circular shape like a car steering wheel, so it is also called a steering wheel handwheel
The crank can be replaced by another form of motion energy such as pneumatic or electric. For compressed air, people add a pneumatic cylinder to control the valve, and for electric control, an electric motor is installed to close the valve.

Types of knife gate valves today

Cast iron gate valve

Cast iron knife gate valve

Introduction of cast iron gate valve

Cast iron knife gate valve is a valve line made of cast iron. This is a relatively common and widely used valve line in industry. The cast iron knife gate valve is painted with an epoxy anti-rust coating to increase the service life of the valve and prevent corrosion and rust for the valve.

Cast iron shovel valve (another name for knife valve) with 304 stainless steel vane body works well in many different environments. Currently, we are supplying to the market a cast iron gate valve line from Taiwan, China with full sizes from DN50 -DN1500

Specifications of cast iron knife valve

• Valve size: DN50 – Dn1500
• Body material: ductile cast iron
• Outer coating: Blue epoxy
• Valve disc material: 304 . stainless steel
• Working pressure: PN10
• Working temperature: 150 degrees
• Connection Type: Flange
• Standard: BS, JIS
• Working type: Hand crank, pneumatic cylinder, electric motor
• Item Status: Available
• Origin: Spain, Korea,  Taiwan, China.
• Warranty: 12-18 Month.
• Nationwide Delivery

Steel knife gate valve

Steel knife gate valve is a type of valve made from special steel material used for environments with higher temperatures and pressures that cast iron valves cannot meet.

However, the steel knife gate valve line is less used because of its corrosion and rust properties. Therefore, steel gate valves are now rarely used and people gradually switch to cast iron gate valves because of the cost

Stainless steel knife gate valve

Introduction of stainless steel knife gate valve

Knife gate valve stainless steel (English name Knife gate valve stainless steel) is a valve line made of stainless steel used to open and close fluids. Valves are made from Inox 201, Inox 304, Inox 316 but the most popular and popular is still 304 stainless steel knife gate valve.

Stainless steel knife gate valve can be controlled by hand crank or controlled by electricity, pneumatic depending on the needs of use. Stainless steel knife gate valve can work well in chemical environments because the stainless steel material itself is very good in today's chemical environments.

In addition, stainless steel is able to withstand higher temperatures and pressures than cast iron gate valves, so it is also widely used in environments requiring high temperature and pressure that cast iron gate valves cannot use. 

Stainless steel knife gate valve currently we are importing goods from Taiwan, Korea, China with full sizes from DN50-DN1500 to ensure the use of all current industrial pipes.

Specifications of stainless steel knife gate valve

• Valve size: DN50 – DN1500
• Valve material: stainless steel 201, stainless steel 3044, stainless steel 316"
• Working pressure: PN10, PN16
• Operating temperature: Max 200°C
• Opening and closing type: Hand crank, pneumatic cylinder, electric motor
• Connection Type: Flange
• Standard: BS, JIS, ANSI, DIN
• Item Status: Available
• Origin: Spain, Korea,  Taiwan, China.
• Warranty: 12-18 Month.
• Nationwide Delivery

Pneumatically controlled knife gate valve

Introduction of pneumatic knife gate valve

Pneumatic knife gate valve, also known as pneumatic control knife valve, is a valve line that operates on and off fluid thanks to a pneumatic cylinder instead of a handwheel mounted on the valve.

Pneumatic control knife valve is used with many different materials such as stainless steel knife valve with pneumatic control, cast iron knife valve with pneumatic control.

With pneumatic opening and closing, it helps to control the valve quickly, reducing control labor and increasing working efficiency in the business. Along with that is to make use of compressed air in the business

Specifications of Pneumatically Controlled Knife Valve

• Valve size: DN50 – DN1500
• Valve body material: Cast iron body, Stainless steel body, carbon steel
• Cylinder material: aluminum alloy
• Working pressure: PN10, PN16
• Working temperature: max 200°C
• Connection type: Flange, clamp flange
• Connection standards: JIS, BS, DIN, ANSI
• Inlet pressure of pneumatic cylinder: 3 – 8bar
• Working environment: Clean water, waste water, mud, cement...
• Item Status: Available
• Origin: Spain, Korea,  Taiwan, China.
• Warranty: 12-18 Month.
• Nationwide Delivery

Electric knife gate valve

Introduction of electric knife gate valve

An electric knife gate valve or it is often called an electric knife gate valve is a valve that replaces the steering wheel handwheel with an electric control motor connected to the valve shaft to control the valve opening and closing.

The voltage used of the electric control knife valve is 220V, 24V, 380V. It works fully automatic opening and closing thanks to the motor installed on the valve shaft to help control the vane up and down to open and close at will.

Electric knife gate valve is also used with cast iron knife valve, steel knife gate valve, stainless steel knife gate valve to replace the handwheel with a pneumatic motor to operate.

Specifications of electric knife gate valve

• Valve size: DN50 – DN1500
• Valve body material: cast iron body, stainless steel, steel
• Engine material: Alloy
• Use voltage: 220V, 24V, 380V
• Operating temperature: Max 200°C
• Working pressure: PN10, PN16
• Connection type: Flange connection
• Connection standards: JIS, BS, DIN, ANSI
• Working environment: Clean water, sewage, mud, wood pulp, cement
• Item Status: Available
• Origin: Spain, Korea,  Taiwan, China.
• Warranty: 12-18 Month.
• Nationwide Delivery

Where to buy knife gate valve? Quotation of knife gate valves

Knife gate valves are the most widely used valves in industry today. It has a unique design from the valve body to the vane that allows the valve to operate in viscous, dusty, and garbage environments without fear of affecting its opening and closing function.

In addition, the design of the valve makes it lighter than other gate valves of the same size and type, but does not affect the function and operating temperature of the valve.

Therefore, the valve is very widely used and the need to find a place to buy all kinds of knife valves is also very much. We currently supply all lines of industrial knife valves with the following advantages about us:

Full range of sizes from DN50 - DN1500. Always available in sizes up to DN600

Phuc Minh - Direct importer and exclusive distributor in Vietnam market

Reasonable price, cheapest in the market today. Commitment to sell at the right price offered by the manufacturer

Products are warranted for 12 months

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