Home - Products - Flat Gate Valve - Details

Lug Plate Gate Valve

Name: China Customized Lug Plate Gate Valve - Discount Lug Plate Gate Valve Made in China - Advanced Technology Valve
Brand: Advanced
SKU: 229393018

The valve products produced by the company are widely used in petroleum, natural gas, chemical industry, polysilicon, coal chemical industry, power station, metallurgy, papermaking, medicine, military industry and other industries.

Send Inquiry

Description

Your Professional Lug Type Knife Gate Valve Suppliers in China

Zhejiang Advanced Technology Valve Co., Ltd. is a technology-based manufacturing enterprise, which integrates designing, manufacturing and marketing valves and owns one stop service. The company's leading products include flat gate valves with diversion holes, flat gate valves without diversion, expansion double gate flat gate valves, hard-sealed double gate flat gate valves, and special flat gate valves for alumina plants.

Advanced Equipment

The company has various precision machining and testing equipment, large-scale surface CNC grinders, sphere machining centers and other new technologies, as well as the first-class full-performance testing equipment in the country.

Wide Range of Applications

18 Month Warranty

We offers an 18-month warranty for each valve. Within these 18 months, if our products fail, leak, or even damage during use (excluding human factors), we will be responsible for replacing the products with quality problems and delivering them to your warehouse.

Excellent Pre-sales Service

Our pre-sales service includes the communication and confirmation of a series of transaction terms before you place an order, including price, product drawings, trade terms, delivery date, etc. In addition, in the process of order production, we will let you know the status of the product in the form of pictures and videos to confirm the production process.

Introduction of Lug Type Knife Gate Valve

The Lug knife gate valves are designed for convenient, unrestrictive control over pipeline flow. Specifically made for industrial use, size range from DN50-DN1800 in one piece casting body. A broad body and trim materials are selected and fabricated to suitable for various service conditions.

Our Related Products

Electric Flat Gate Valve

The electric gate valve can be controlled remotely by the control system, and the operation is convenient. Manual gate valves can only be operated manually on site.

Pneumatic Flat Gate Valve

Remote control and centralized management can be realized. Simple operation and small maintenance workload.

Electro-Hydraulic Flat Gate Valve

Electro-hydraulic plate gate valve adopts dual control mode of power and hydraulic, which can realize flow control, thereby reducing energy consumption and improving efficiency.

Hydraulic Flat Gate Valve

The output torque can be accurately adjusted through the constant pressure relief valve, including the adjustment of the opening and closing torque, and even can be directly reflected through the hydraulic instrument.

Manual Slab Gate Valve

It has the advantages of simple and compact structure, reasonable design, reliable sealing, light and flexible operation, small size, smooth channel, low resistance, easy installation and easy disassembly.

Bevel Gear Plate Gate Valve

When the valve is fully opened, the flow resistance coefficient is very small, and the valve will eliminate the function of the valve disc and the dirt on the sealing surface every time the valve is opened and closed.

Sprocket Plate Gate Valve

Pneumatic-Hydraulic Flat Gate Valve

The packing is made of flexible graphite ring and graphite packing, reliable sealing, light and flexible operation.

Cast Steel Flat Gate Valve

The shell is cast, which can make the appearance of complex shape and is more beautiful than the forged shell.

Product Specification

Materials	Cast lron, Ductile Iron, Carbon Steel, Stainless Steel, Alloy Steel, Duplex steel
Pressure Ratings	ANSI 150#, PN10, PN16
Size Ranges	DN50-DN1800 mm (Larger sizes upon request)
Ends Connections	Lugged
Actuations	Manual, Pneumatic, Electric, Hydraulic (Counterweight) & Electro-hydraulic
Flange dimensions	ANSI B16.5
Seal tightness test	MSS SP-81 2001
Face-to-Face dimensions	MSS SP-81-2001
Temp and Pressure based on	ASME B16.34
Butt-weld dimensions	ANSI B16.25
Packing	To be packed in suitable wooden cases as per client's option or customized
Shipping & Delivery	20-25 days lead time; deliver by ship from Ningbo port or Shanghai port
Notes	Serial valve connecting flange and butt-welding terminal size can be designed at customers' request. The material of the main parts and sealing surface of the valve can be designed and selected according to the actual working conditions or the special requirements of users.

Design Features of Lug Type Knife Gate Valve

● Our lugged knife gate valve is bi-directional tight and can therefore be installed into a pipe system independent of pressure direction.
● A fully lugged valve body design and integrated flange gaskets makes it easy to install and also allows end-of-pipe installations.
● With a full bore design this gives excellent flow characteristics and makes it suitable for fluids, sludge and liquids with solids in suspensions such as water, sewage and bio mass.
● This valve has a robust coated and fully lugged valve body in nodular iron, with a gate in stainless steel and polished edge in order to minimize friction and to lower required operation force.
● The valve is supplied with a sealing profile in Nitrile or EPDM and this is reinforced with a steel core.
● The valve is designed, manufactured, inspected and tested according to pressure equipment directive 2014/68/EU category I and II module A2.

What are Lug Type Knife Gate Valves Used for

Lug knife gate valves are used in a wide range of industrial and commercial applications. Some of the most common applications of knife gate valves include:

HVAC Systems

Used in heating, ventilation and air conditioning systems to control the flow of water and other liquids.

Pneumatic Conveying

Controls the flow of materials in pneumatic conveying systems, such as in the mining, fertilizer, and cement industries.

Expansion Flat Gate Valve with Diversion Hole

Industrial Processes

Used to control the flow of liquids, gasses, and powders. They are commonly used in the chemical, food and beverage, and pharmaceutical industries, as well as in paper and pulp mills, and cement plants.

Water and Sewage

Used in water treatment plants and sewage treatment plants to control the flow of water, sewage, and other liquids. Often used in applications where a tight shut-off is required, such as in high-pressure and high-temperature applications.

What are the Parts of the Lug Type Knife Gate Valve

Knife gate valves are relatively simple valves with few moving parts. The parts of a typical knife gate valve are listed below:

Knife
The "knife" is the metal plate that allows or stops the flow. The plates can either be rectangular or circular, depending on the design of the valve. The leading edge of the knife is worked into an edge. It must be noted that in most cases this edge is relatively blunt and not as sharp as its name would suggest.

Spindle
This is connected to the knife, and is used to position the knife in the open or closed position. The stem can be in the form of a screw if manually or electrically actuated or a solid shaft (or piston) if pneumatically actuated.

Body
The body of the knife gate can be manufactured using a range of different methods from casting to fabrication of weldments. As the knife gate valve opens, the knife is pulled out of the valve past a set of seals that prevent the process fluid from escaping.

Actuation
Knife gate valves can be opened or closed either with a manual handwheel-operated system or with an automatic system. Automatic systems can include pneumatic cylinders or electric gear motors that are used to open or close the valve.

Seals
The seals on a knife gate valve are usually flexible to allow for the knife gate to sit tightly against them while also preventing foreign debris from building up between the two opposing seals. Additional flexible seals are also present where the knife leaves the lower half of the valve body.

Our Certificates

We guarantee that all our products have passed the quality control and stringent regulations imposed not only by our company but also by international organizations. Our certifications assure that our product line is top grade by industry standards.

Common Problem of Lug Type Knife Gate Valve

Q: How do gate valves and knife gate valves work?

A: Gate valves open by lifting a round or rectangular gate (or wedge) out of the path of the fluid. The sealing surfaces between the gate and seats are planar, so gate valves are often used when a straight-line flow of fluid and minimum restriction is needed. They have a flat gate closure that slides in and out or up and down between two parallel plates to open or close the valve. Gate valves are used for shut-off, rather than flow regulation because they only have two settings: on and off. While a knife gate valve performs exactly as the name implies. These types of valve were originally designed for the pulp and paper industry. Stringy pulp would impinge between the wedge and seat of a normal gate valve and prevent flow shut-off. Knife gate valves were designed with a sharp edge to cut through the pulp and seal. With this type of useful attribute, the knife gate valve has become invaluable in applications involving slurry, viscous fluids and other systems where impingement is an issue.

Q: How does a knife gate valve work?

A: A knife gate valve has a component with a knife used to cut through heavy liquid clogging. These valves were designed for some of the world's harshest corrosive and abrasive conditions. The use of KGVs has become essential in viscous liquids, slurry, and other systems where impingement is an issue because of their extremely effective design. The use of KGVs has now extended to many processing plants. They are now available in large sizes for accommodating high-density flows of varnish, slurry, wastewater, heavy oils, and more. These valves have low-pressure constraints. They are meant to be placed in an elastomer seal after use. The thick and dry material ends up on the soft seals on the gate and ends as a solid mass or powder passes through the knife gate. If it happens, seals will fail to be tight enough. Seals need to be replaced when this happens.

Q: What is a knife gate valve?

A: A knife gate valve is a specific design of a valve that uses a knife edge that can enter the flow stream and, if necessary, use the edge of the gate to separate any materials that might prevent the valve from sealing completely.

Q: What is the difference between a knife gate valve and a wedge gate valve?

A: The parallel gate valves use a flat gate between two parallel seats, and a popular type is the knife gate valve designed with a sharp edge on the bottom of the gate. The wedge-shaped gate valves use two inclined seats and a slightly mismatched inclined gate.

Q: What are the disadvantages of a knife gate valve?

A: As such, they are generally specified in larger sizes for the handling of thicker flows in demanding applications. Despite this, knife gates are known for their low-pressure limitations. As such, this makes them a less desirable shut-off valve for applications which require cleanliness or optimal hygienic conditions.

Q: Which is better ball valve or knife gate valve?

A: Gate valves are best suited for applications that require infrequent operation and small installation space. Ball valves are ideal for applications that require fast cycle times, multiple ports, reliable, tight seals and/or frequent operation.

Q: What are the advantages of a knife gate valve?

A: Their smooth surfaces are easy to clean and do not contaminate the fluid. Fast Flow Cutoff: Knife gate valves have the capability for rapid closure, allowing them to swiftly cut off fluid flow. This makes them useful in emergency situations where quick flow cessation is required.
What is the alternative to a knife gate valve?
Unlike conventional knife gate valves, SlurryFlo control valves are designed for throttling tough slurries. When used to control abrasive media, conventional knife gate valves direct high velocity flows into the valve body and downstream pipe, accelerating wear.

Q: Are knife gate valves directional?

A: Knife gate valves can be unidirectional or bi-directional. Metal seated: Metal seated knife gate valves have a Class IV leakage rate, which is acceptable according to MSS standards.

Q: Can you throttle a knife gate valve?

A: Gate valves are not intended for throttling. They are designed such that media flowing at high velocity can vibrate and quickly erode or tear a partially-open valve disc off its seat. In a pinch, gate valves should only be used for throttling when the gate is 90% closed.

Q: What is the leakage rate for a knife gate valve?

A: For metal and resilient seated check valves the leakage rates referred to in MSS SP-81 for knife gate valves is often specified. The maximum permissible leakage rate on each seat shall be 10 milliliters per hour, per inch of diameter of nominal valve size.

Q: What is the pressure rating of a knife gate valve?

A: The knife gate valves SLH and SLX are designed for the most demanding high pressure applications with slurry and other abrasive media where operation reliability and low life cycle cost are emphasized. The SLH is designed for pressure up 20 bar/290 psi while the SLX is designed for 50 bar/720 psi.

Q: What are the applications of knife gate valve?

A: Such lightweight and low-profile knife gate valves are used in a wide variety of applications, like sewage pipelines of smaller diameters, food-processing industry for used water treatment, and even energy plants for technical water pipelines and cooling water pipelines.

Q: What is the difference between a gate valve and a knife gate valve?

A: In brief, a knife valve employs a blade to cut through thick fluids, while a gate valve uses a slide plate to shut off the flow of dry bulk material. The sharp and beveled edge of a knife valve makes it ideal for large-sized applications involving varnish, paper pulp, light grease, and wastewater.

Q: Which is better unidirectional or bidirectional knife gate valve?

A: A bidirectional valve is designed to block fluid flow in both upstream and downstream directions. A unidirectional valve has a seat that seals the pressure source in one direction. Therefore, it is ideal for applications that require one direction of flow only.

Q: What is a bypass gate valve?

A: Bypass valves are used during the pipeline filling process to reduce the risk of damage to components and to equalize downstream pressure and reducing operating torque. High strength and impact resistant body manufactured from ductile iron and EPDM encapsulated gate.

Q: What is a gate valve?

A: A gate valve is the most common valve for water supply systems. It represents a linear-motion isolation valve and has a function to stop or allow the flow. Gate valves got their name from the closure element sliding into the flow stream to provide shutoff and, therefore, acting like a gate. Gate valves are used to isolate specific areas of the water supply network during maintenance, repair works, new installations, as well as to reroute water flow throughout the pipeline.

Q: What is the body of a gate valve?

A: Gate valve bodies can have many different process connections that can include: flanged, threaded, and welded parts. The valve body has a recess into which the gate slides. The sides of these recesses are called the seat. The gate sits precisely against these faces when it is closed to effectively seal the valve.

Q: Can gate valves be repaired?

A: Yes, gate valves can be repaired. Common repairs include replacing the valve stem, gate, or seats, as well as addressing leaks or corrosion. However, the extent of the repair will depend on the specific issue and the condition of the valve.

Q: How does a gate valve go bad?

A: The most common causes of gate valve failure are wear and the seat's and wedge's corrosion. The inner areas of a valve wear off over time, and corrosion can make the wedge stick in the open or closed position. When the handwheel is overused, the stem leading to the wedge breaks off and renders the valve useless.

Hot Tags: lug plate gate valve, China lug plate gate valve, Dark Rod Flat Gate Valve, Flat Gate Valve Without Diversion Hole, Five piece Flat Gate Valve Without Diversion Hole, Plate Welded Flat Gate Valve, National Standard Flat Gate Valve, API 6D Flat Gate Valve

Previous:Wafer Flat Gate Valve

Next:Hydraulic Flat Gate Valve

Send Inquiry