Manually Operated Gate Valve
Tianjin Liangfa Technology Co., Ltd. is It is a large-scale valve manufacturing company integrating R&D, production and sales. The main products include butterfly valves, high temperature and high pressure valves, gate valves, check valves, globe valves, regulating valves, ball valves, water supply and drainage valves, marine valves, API valves and other series.
Why choose us
Professional team
We have a professional team that is familiar with product performance, can understand customer needs in a timely manner, and can fully demonstrate product advantages. We are equipped with professional after-sales service personnel to ensure that we respond to user requests within 24 hours and put forward practical solutions.
Our certificates
Our products have passed ISO9001:2000 international quality management system certification, ISO14001:2004 environmental management system certification, and GB/T28001-2001 occupational health and safety management system certification.
Production equipment
We have all kinds of sophisticated large and medium-sized main production equipment and main inspection and testing equipment and instruments.
Our company provides the following products
When the gate is fully open, it is retracted into the valve body, allowing unrestricted flow through the valve. To close the valve, the gate is pushed down between the seats, creating a tight seal and blocking the flow. Wedge type gate valves are commonly used in applications where a tight shut-off is required, such as in oil and gas pipelines, water treatment plants, power plants, and various industrial processes.
Advantages Of Wedge Gate Valves
Effective Shut-Off
Wedge gate valves provide reliable on/off control, ensuring a tight seal when fully closed.
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Low Pressure Drop
When fully open, these valves offer minimal resistance to fluid flow, resulting in a low-pressure drop across the valve.
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Bi-Directional Functionality
They are designed to provide shut-off in both flow directions, enhancing their versatility in pipeline systems.
03
Durability
Constructed from high-quality materials, wedge gate valves are capable of withstanding high pressures and temperatures, contributing to a long service life.
04
Cost-Effectiveness
Compared to other valve types, such as ball valves, wedge gate valves tend to be more economical, especially in larger sizes.
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Application of Wedge Type Gate Valve
Oil and Gas Industry
The oil and gas industry rely heavily on wedge gate valves to control the flow of oil, gas, and other fluids in pipelines and processing plants. The ability of wedge gate valves to provide a reliable seal and withstand high pressures and temperatures makes them indispensable in this industry.
01
Water Management Systems
Wedge gate valves play a crucial role in water management systems, such as dams, reservoirs, and wastewater treatment plants. They are used to regulate water flow, control water levels, and prevent backflow, ensuring efficient and safe operation of these systems.
02
Power Generation
Wedge gate valves are widely utilized in power generation facilities, including thermal power plants and hydroelectric plants. They are used to control the flow of water, steam, or other fluids in various processes, ultimately contributing to the generation of electricity.
03
Chemical and Petrochemical Industry
In chemical and petrochemical plants, wedge gate valves are utilized to handle a wide range of corrosive and toxic fluids. Their ability to provide a tight seal and resist chemical attacks makes them suitable for such demanding environments, ensuring safe and efficient operation.
04
Manual Knife Gate Valve
The manual knife gate valve is a type of valve that plays a critical role in process control and fluid management applications. The valve gets its name from the shape of its closure mechanism, which resembles a knife.
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Minimum Order Quantity |
01 Piece |
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Size Range |
DN 50 (2”) to DN 1200 (48”) |
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Applicable Standards |
AWWA C520-14 / MSS SP-81 |
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Pressure Rating |
PN3 (45 PSI), PN6 (90 PSI) and PN10 (150 PSI) depending upon housing material, primarily for liquid applications. |
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Temperature Range |
-20°C to 250°C |
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Flange drilling |
ASME B16.5/ASME B16.47 #150 / BS-EN 1092 PN 10 / PN 16 |
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Mode of operations |
Manual, chain wheel, pneumatic, electric actuator and Hydraulic |
Advantages of Manual Knife Gate Valve
Simple design : These type of valves are relatively simple in design and do not require external power or control systems, making them easy to install, operate and maintain.
Cost effective : Manually controlled knife gate valves are a cost effective choice for applications where automation is not necessary or practical.
Corrosion resistant materials : The gate and other components of manual knife gate valves are typically made of stainless steel or other corrosion resistant materials, ensuring long lasting performance in harsh environments.
Tight seal : This type of controls are designed to provide a tight seal which helps prevent leaks and ensures efficient operation.
Versatility : Manual knife gate valves are available in a variety of sizes, materials and designs to suit different industrial applications.
Easy to operate : Hand operated blade gate valves are typically operated by turning a hand wheel or lever which is connected to the actuator mechanism.
Low maintenance : Manual knife gate valves are relatively simple in design and require minimal maintenance, making them a cost effective choice for industrial applications.
Applications of Knife Gate Valve
Knife gate valve is suitable for gold ore powder, tailings, paper pulp, wood pulp, fiber, dust, chemical treatment sewage, sedimentation tank, ore, slag, coal slime, asphalt, silo outlet, fruit, grain, cement slurry, Slaughterhouse wastewater, etc.
The knife gate valve can be equipped with a hand wheel, manual zipper, spur gear transmission, bevel gear transmission, pneumatic and electric.
The interior of the knife gate valve can be made into V-shaped, triangular, or pentagonal channels. The V-shaped gate can be used as an adjustment control.
The connection forms include wafer type and flange lug type. The seals include a metal-to-metal hard seal, metal-to-polyurethane seal, and reinforced polytetrafluoroethylene soft seal.
Knife Gate Valve Parts
Valve Body
It is usually made of a strong material such as cast iron or stainless steel and contains a flow channel for the fluid.
Seat Seal
It surrounds the perimeter of the flow channel and provides a bi-directional and airtight seal.
Actuation Mechanism
A rising stem or screw can be used to lift and lower the knife gate. The actuation mechanism can be manual or pneumatic/electric.
Knife Gate
It is a thin plate that has a sharp edge resembling a knife. It rises and lowers inside the valve to allow or block the flow of the fluid.
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