The Gate Valve has an opening and closing gate. The movement direction of the gate is perpendicular to the direction of the fluid. The gate valve can only be fully opened and fully closed, and cannot be adjusted or throttled. The gate
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valve is sealed by the contact between the valve seat and the gate plate. Usually, the sealing surface will be surfacing with metal materials to increase wear resistance, such as surfacing 1Cr13, STL6, stainless steel, etc. The gate has a rigid gate and an elastic gate. According to the different gates, the gate valve is divided into a rigid gate valve and an elastic gate valve.
Gate valve is a kind of valve with a large number of consultations every day. It is often used in water supply systems. The advantages of gate valves are:
1. Small flow resistance. The medium channel inside the valve body is straight, and the medium flows in a straight line. When the gate is fully opened, the internal resistance of the valve body channel is almost zero, and the flow resistance is very small.
2, opening and closing labor-saving. Whether the gate valve is open or closed, the movement direction of the gate is perpendicular to the flow direction of the medium, and the resistance of the gate to the lifting movement is also very small, and it is very labor-saving to open and close.
3. The full opening and full closing of the gate valve requires a long stroke, and the closing time is relatively long, which also makes the water hammer phenomenon less likely to occur.
4. The two sides of the gate valve channel are symmetrical, and the installation is not restricted by the flow direction of the medium, which is convenient for installation.
5. The shape is simple, the length of the structure is short, the manufacturing process is good, and the scope of application is wide.
6. Wide range of uses, gate valves are made of gray cast iron, ductile iron, cast steel, stainless steel, forged steel and other materials. Different materials can be used in different working conditions and environments, and have a wide range of applications.
Precautions for installation and use of gate valve
1. The handwheel, handle and transmission mechanism are not allowed to be used for lifting, and collision is strictly prohibited.
2. The double gate gate valve should be installed vertically (that is, the valve stem is in the vertical position and the handwheel is at the top).
3. The gate valve with bypass valve should open the bypass valve before opening (to balance the pressure difference between the inlet and outlet and reduce the opening force).
4. The gate valve with transmission mechanism shall be installed according to the provisions of the product instruction manual.
5. If the valve is frequently switched on and off, lubricate it at least once a month.
6. The gate valve is only used to fully open and fully close the medium on various pipelines or equipment, and is not allowed to be used for throttling.
7. For gate valves with handwheels or handles, auxiliary levers should not be added during operation (if the sealing is not tight, the sealing surface or other parts should be checked and repaired). Turn the handwheel and handle clockwise to close, and vice versa. The gate valve with transmission mechanism should be used in accordance with the stipulations in the product instruction manual.
The difference between a metal seated gate valve and a resilient seated gate valve:
What are the differences between hard sealing gate valves and soft sealing gate valves? This article will introduce you.
material difference:
The material of the hard sealing gate valve body is mainly cast steel, stainless steel and forged steel. The gate plate and internal flow channel seal are all made of Stellite alloy accumulation welding.
The material of the soft-sealed gate valve body is mostly cast iron, the valve plate is covered with rubber, the appearance of the soft-sealed gate valve, and the valve wall of the flow channel side are all sprayed with electrostatic powder. Not only is the appearance beautiful, but more importantly, the smoothness of the flow channel and the inner valve wall ensures that the rubber-lined gate will not be affected by the roughness of the inner valve wall when opening and closing.
difference in use:
Soft-sealed gate valve is suitable for non-corrosive gas-liquid medium at normal temperature (&#;80&#;). Such as water, air, oil, water treatment sewage and other pipelines. And has a good sealing effect, almost zero leakage can be achieved.
The hard-sealed gate valve is suitable for high temperature (&#;425&#;) with slightly corrosive gas and liquid. Such as steam, heat transfer oil, sewage, petroleum, chemical industry, metallurgy, pipeline. Can have a certain degree of wear resistance.
To sum up, the difference between a soft-sealed gate valve and a hard-sealed gate valve is that the sealing performance of the soft-sealed gate valve is better than that of the hard-sealed gate valve, but the temperature and wear resistance of the hard-sealed gate valve is better than that of the soft-sealed gate valve. Each has advantages and disadvantages.
TH Valve is a professional manufacturer of butterfly valve, gate valve, check valve, globe valve, knife gate valve, ball valve with API, JIS, DIN standard, used in Oil, Gas, Marine industry, Water supply and drainage, fire fighting, shipbuilding, water treatment and other systems, with Nominal Diameter of DN50 to DN, NBR/EPDM/VITON, Certificates & Approvals: DNV-GL, Lloyds, DNV, BV, API, ABS, CCS. Standards: EN 593, API609, API6D
Video of resilient seated gate valve:
Related news/knowledge:
Wedge gate valves have several advantages that may be considered when designing a pipeline system. They are engineered to work in full open or closed position, so they can&#;t be used for regulating the flow, Anyway, there are other characteristics that make them an excellent option compared to other flow regulating devices, like the ones below:
The quick reversing of a flow during shutting down procedures, a phenomenon known as &#;water hammer&#;, is not quite usual in gate valves due to the slow opening-closing movement.
Face to face dimension can be really small with some gate designs due of the nature of the movement of the disc mechanism. This can be quite useful in some piping designs limited by the available space.
Once in full open position, the resistance of the internal channel of the body to the flow is very low because it keeps a straight line, so turbulences generated are minor than in other types of valve designs.
Opening and closing the valve requires a minor effort due to the movement of the mechanism, that is not directly against the flow, like in some other valve designs.At high pressures, friction of the disc against its guiding, can be compensated with a bypass.
Wedge gate valves are easy to install, because both sides are symmetrical, without a predefined flow direction.This fact reduces error factors during the assembly of the pipeline system or maintenance procedures.
Less complex manufacturing implies higher reliability and lower maintenance.
Wide application range, because gate valves are quite versatile, and can be used in oil, steam, water, high density liquids and other media, including granular solids.
Gate valves have a great sealing performance favored by the flow pressure, that helps keeping a tight union between the gate and the seat.
If you would like more information about this product, please feel free to contact us. Recommend other popular products for you: API 6A Gate Valve Manufacture, API 6A Valves Manufacturer, Specifications Of Slab Gate Valve, Control Valve Maintenance Procedure, Gate Valve Hydraulic, Screw Gate Valve
Nowadays, there are two kinds of valve seat gate valves on the market, one is the resilient seated gate valves, and the other is the metal seated gate valves. And before the resilient seated gate valve was introduced to the market, gate valves with a metal seated wedge has been widely used.
What is a soft seal gate valve?
A soft seal gate valve is a valve that uses a reliable resilient seal between the valve gate and the valve seat to achieve a sealing effect through the friction between the seal and the gate to control the flow of media in the pipeline and cut off the fluid. Compared with the traditional metal sealed hard seal gate valve, the soft seal gate valve is more advantageous in terms of sealing and material adaptability.
The soft seal gate valve is mainly composed of grey cast iron or ductile iron body, bonnet, gate, stem, and sealing ring. Both sides of the gate are fitted with reliable resilient sealing rings, which are usually made of resilient materials such as rubber or PTFE. These materials have excellent wear resistance, corrosion resistance, and high-temperature resistance, will not produce problems such as air and water leakage in the use of the valve, and can maintain a stable seal.
The advantages of the soft seal gate valve are as follows:
1. Easy to operate:
The soft seal gate valve has a simple structure and is easy to operate, usually only a gentle push or a pull to achieve the switching action.
2. Good sealing performance:
Soft seal gate valve adopts a reliable elastic sealing ring, good sealing performance, not easy to leak, with reliable sealing.
3. Strong adaptability:
Soft seal gate valve has a wide range of applications, including municipal engineering, chemical, pharmaceutical, food, light textile, and other industries, and can be applied to a variety of media, including water, oil, gas, acid, and alkali, etc.
4. Durable:
The sealing ring of the soft seal gate valve is usually made of rubber or other elastic materials, which have excellent wear resistance, corrosion resistance, and high-temperature resistance, and the valve has a long service life.
5. Easy to maintain:
Soft seal gate valves are easy to maintain, the cover can be opened and the seal can be inspected and replaced directly without the need to dismantle the valve.
In general, the soft seal gate valve has the advantages of easy operation, reliable sealing, durability, and easy maintenance. It has a wide range of applications in general industrial pipelines, municipal projects, construction projects, pharmaceuticals, food, light textile, and other fields.
What is a hard seal gate valve?
Hard seal gate valve is a valve product with more stable sealing performance, high-temperature resistance, corrosion resistance, and wider adaptability. The sealing structure of the hard seal gate valve uses friction between metal materials to achieve the sealing effect. The excellent wear resistance and corrosion resistance of this sealing method can adapt to a variety of complex media occasions, and can also handle applications with high tightness requirements.
The hard seal gate valve has the following characteristics:
1. High temperature and pressure resistance:
Hard seal gate valves can be operated in media temperatures up to 400°C and pressures up to -psi.
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2. High sealing:
The hard seal gate valve adopts a metal-to-metal friction seal for a more stable sealing effect, with better sealing and longer service life.
3. Corrosion resistance:
Hard seal gate valve sealing materials usually use stainless steel and other corrosion-resistant materials, able to operate in harsh media such as strong acids, strong alkalis, and high concentrations of salt solutions.
4. Adaptable:
Hard seal gate valves use advanced sealing mechanisms that can adapt to high-viscosity media, media containing particles, cellulose, residues, and other media to prevent blockage.
In general, the hard seal gate valve is suitable for chemical, electric power, oil, and gas industries, for high temperature, high pressure, strong corrosive media, high viscosity media, and media containing solid particles or cellulose media and other harsh media in the pipeline system to cut off and regulate the flow.
Soft seal gate valve applicable working conditions:
The soft seal gate valve is an industrial valve that is sealed by friction between a flexible seal and the gate. Compared with the hard seal gate valve, the soft seal gate valve has better sealing performance and a wider range of applications.
The following are the applicable working conditions of soft seal gate valves:
1. Low and medium pressure pipelines:
Soft seal gate valves are suitable for low and medium pressure (PN&#;2.5MPA) pipelines of water, sewage, drainage, natural gas, etc.
2. Low-temperature environment:
The sealing ring of soft seal gate valves is usually made of rubber and other materials, which can maintain good elasticity and sealing performance in a low-temperature environment.
3. Corrosive media:
Soft seal gate valve is suitable for corrosive media control and shut-off, using different materials seal rings, such as EPDM, NBR, etc., and can adapt to the requirements of different media.
4. Food, pharmaceutical, and other industries:
Soft seal gate valves can be selected to meet the FDA standard material, suitable for food, pharmaceutical, and other industry requirements.
In general, the soft seal gate valve is suitable for low and medium-pressure pipelines, and a wide range of media, with excellent sealing performance and adaptability, and is a commonly used type of valve in industrial pipelines.
Hard seal gate valves for working conditions:
Hard seal gate valves are mainly used for cutting off and regulating the flow in the pipeline system of high temperature and high pressure, strong corrosive media, high viscosity media, media containing solid particles or cellulose, and other harsh media.
Specifically, the hard seal gate valve is suitable for the following working conditions:
1. High temperature and high-pressure working conditions:
Hard seal gate valve can be applied to the medium temperature up to 400&#;, pressure up to -psi conditions of operation.
2. Strong corrosive media:
Hard seal gate valve has high corrosion resistance, and can be used in a variety of acid, alkaline, salt, and other strong corrosive media occasions.
3. High viscosity media:
Hard seal gate valves have good self-cleaning and fluidity, and can be used in pipeline systems for high-viscosity media.
4. Solid particles or cellulose-containing media:
Hard seal gate valve has an advanced sealing mechanism, which can better handle media containing particles, cellulose, residue, etc., and prevent blockage.
In general, the hard seal gate valve is suitable for industrial fields such as automobile manufacturing, petrochemical, chemical fiber, food, paper, medicine, etc., and has a wide range of applications in pipeline systems dealing with harsh media.
What is the main difference between soft seal gate valve and hard seal gate valve?
The main difference between soft seal gate valve and hard seal gate valve is in the sealing method, material composition and scope of application.
1. Sealing method:
Soft seal gate valve adopts reliable elastic sealing ring, through the friction between the sealing ring and the gate to achieve the sealing effect, sealing performance is good; hard seal gate valve uses metal material as the sealing material, through the friction between metal and metal sealing, sealing effect is more stable but requires greater operating force.
2. Material composition:
Soft seal gate valve sealing material is usually selected from rubber or other elastic materials, while hard seal gate valve sealing material is usually used in metal materials, such as stainless steel.
3. Scope of application:
Soft seal gate valves are suitable for low temperature, low pressure, and non-corrosive media, such as municipal engineering, etc.; while hard seal gate valves are suitable for high temperature, high pressure, strong corrosive media, high viscosity media and harsh media such as solid particles or cellulose media, such as chemical, electric power, oil, and gas industries.
In general, soft seal gate valve and hard seal gate valve have their own advantages and disadvantages, the user should choose the appropriate type of valve according to the actual needs and working conditions and environment.
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