There are many different types of check valves available for a variety of applications. They all have unique features that make them ideal for specific applications. The following are the various types of valves.
1. Lift Check Valve
A lift check valve belongs to a kind of automatic valve, its structure is generally composed of the valve body, valve cover, valve flap, sealing device, etc. Its main role is to prevent the backflow of media, prevent the pump and drive motor reversal, as well as release container media.
Lifting check valve flap with the guide rod, the guide rod can be freely lifted in the valve cover guide hole. When the pipeline medium is in accordance with the specified direction (from left to right), the pressure below the valve flap exceeds the pressure above it, push the valve flap along the center line of the valve cover guide hole up, and the valve automatically open, so that the medium flow.
If the fluid flows from right to left, that is, reverse inflow, the pressure above the valve flap is greater than the pressure below it, and the pressure difference between the upper and lower and the valve flap self-weight will be pressed on the valve seat so that the medium can not pass, that is The fluid can not flow backward; and the greater the pressure of the pipeline fluid, the tighter the sealing surface, the better the sealing effect.
2. Swing Check Valve
The swing check valve is a valve that is used to prevent the flow of fluids in one direction. It’s called a “swing” valve because, instead of staying stationary like other types of non-return valves (such as the fixed pressure type), it swings open and closed with movement.
The swing check valve is applicable to various pipelines with nominal pressure PN1.0MPa~42.0MPa, Class150-2500; nominal diameter DN15~1200mm, NPS1/2~48; working temperature -196~540℃ used to prevent backflow of the medium. By choosing different materials (WCB, CF8(M), CF3(M), 1Gr5Mo, 15CrMo1V, it can be applied to a variety of media such as water, and steam, oil, nitric acid, acetic acid, strong oxidizing medium, and urea. Mainly used in petroleum, chemical, pharmaceutical, fertilizer, electric power, and other pipelines.
3. Inclined Disc Check Valve
The inclined disc check valve is a type of check valve that is used in liquid or gas flow control applications. It consists of a single body with a pair of flaps, a set of hinges, and a pair of actuators. The inclined disc check valve is made up of two flat discs which are placed at an angle to each other. The angle between the two discs prevents backflow from happening when liquid or gas tries to go back through the pipeline.
This type of check valve can be installed horizontally or vertically depending on what the application requires and where it needs to be installed on your pipeline system.
4. Silent Check Valve
Silent check valves are used for the purpose of preventing noise caused by the flow of fluid. They are used in industries such as oil and gas, power plants, chemical and petrochemical plants, food and beverage, pharmaceuticals, etc.
There are two types of silent check valves:
①Single disc wafer type
②Dual disc wafer type
The single disc wafer type check valve was designed for industrial applications where space is limited and flow rates are relatively low. It consists of two discs that face each other with a center port between them allowing fluid to pass through from one side to another; however, it prevents leakage from either direction due to its design. The dual disc wafer type is mainly used when there is a need for high-pressure resistance between the discs (upwards facing).
5. Piston check valve
A piston check valve is a one-way valve that consists of a flat disk with a hole in the middle. The disk is attached to a piston that moves up and down inside the valve body when pressure is applied on either side of the piston. The piston is held in place by a spring and when pressure is applied, it pushes out against this spring, opening the valve. The spring then pushes the piston back in and closes off flow through the valve.
Piston check valves are commonly used in fire protection systems and industrial processes where the liquid is being controlled. They can be found in commercial buildings, homes, and other areas where it is important to keep certain areas dry and free from water damage.
A piston check valve can be used on its own or as part of an assembly that includes other types of valves such as globe or gate valves.
6. Through ball swing check valve
A swing check valve is a type of check valve that can be either manually or automatically controlled by the operator. This type of valve is also referred to as an “open” and “close” type of valve. When it is fully opened and shut, there are no restrictions in the flow direction; when it is half open and shut, there will be some restrictions on the flow direction.
The through ball swing check valve uses a circular ball to close off one end, with a central hole for passing liquids through without stopping them from hitting their target destination (such as flowing through pipes). The other end has another hole for opening up when needed instead of just closing off everything completely as many other types do!
7. Micro-resistance slow-closing check valve
The micro-resistance slow-closing check valve is a new type of check valve, which is characterized by small size, high reliability, high safety, and low noise. It has the advantages of stable performance, good quality, and easy maintenance. The micro resistance slow closing type check valve can be used in the fluid system of electronic equipment or industrial systems etc.
8. Globe Check Valve
Globe Check Valves are installed in pipelines to prevent the flow of fluids in one direction. They may be used in the oil and gas industry as well as other industries such as chemical and food processing, where they also serve to keep contaminants from entering a system or contaminating a product. Globe check valves are often used with other types of valves, such as butterfly valves, ball valves, and gate valves.
9. Fixed pressure check valve
The fixed pressure check valve is a popular choice for many industries. It is used to prevent the backflow of fluids. A check valve that is also used to prevent the backflow of fluids, is often found in residential or commercial applications, such as water heaters and fire sprinklers. This style of the check valve can be installed either vertically or horizontally depending on your needs and application.
This type of check valve uses a flap-type design that can close off a pipe if it encounters increased pressure coming from one direction (for example, you might have this type of scenario if there was an air bubble in your pipes). The movable part opens when there’s no pressure or suction acting upon it so that any liquid inside will continue flowing through without interruption; when this happens, it acts like an open gate allowing water/liquid to flow when needed most!
10. Double Flap Butterfly Check Valve
Double flap check valve – also called a double flap butterfly check valve, this device is used to prevent the backflow of fluids. It’s commonly found in industries such as oil and gas, food and beverage, pharmaceuticals, chemicals, and petrochemicals.
Compared to conventional swing-open check valves, double-flap butterfly check valves are typically stronger, lighter, smaller, more efficient, and less expensive in construction. The double-flap butterfly check valve also has special construction features that make this valve a high-performance non-impact check valve. These features include a purge-free opening, independent spring construction for most valve diameters, and an independent valve support system.
11. Eccentric check valve
Eccentric check valves are used to control flow in a piping system by enabling the flow of fluids in only one direction. Eccentric check valves are often used to prevent water hammers in high-pressure systems.
The valve consists of a body with a shaft inside the body. A spring is attached to the shaft and acts against the end of the shaft to force it against two seats that form part of the body. The bottom seat is fixed, while the top seat moves up and down with the shaft as it rotates. When there is no pressure on the top seat, air can pass through freely. However, when pressure is applied to the top seat, it forces to open a small amount of fluid before closing again. This causes fluid to be pushed out of an output port while preventing any backflow into an input port.
Eccentric check valves are commonly used in many applications such as lab equipment, plumbing systems, and industrial processes because they are easy to install and operate with low maintenance costs.
12. Bottom valve
The bottom valve is a check valve that is installed at the bottom of the pump. The bottom valve can be installed on the pump inlet or outlet. When there is no liquid pressure, the spring force of this check valve will close it and block liquid flow from flowing backward through it. When liquid pressure is applied to open this check valve, liquid can be transported without resistance even when there are changes in pressure during operation.
The characteristics of a bottom plug are as follows:
①When you start up your pump, it opens immediately and enables fluid transport without resistance until normal working conditions are reached;
②During operation, there is no need to adjust its opening angle manually; and
③Its structure has few moving parts and provides high reliability and durability with long service life.
13. Axial flow check valve
Axial flow check valves are the most commonly used type of valve and are used in a wide range of industries. They can be found in the oil and gas industry, as well as chemical, petrochemical, and power industries. They’re also used in mining applications and water treatment plants.
This type of check valve is typically installed on piping systems where there is potential for contaminants to enter the system or debris to block it up. The axial flow design helps minimize the potential damage that could occur if debris were to get stuck between the different components within your system—for example, this would prevent damage caused by corrosion buildup or overpressure caused by excessive pressure buildup due to changes in feed rates (flow).
They’re also called “non-return” valves because they do not allow backflow from one pipe into another pipe through which substance has already passed; instead, they allow only forward motion through this opening between two pipes (or chambers) so as not to hamper any further fluid flow through either one side or another – regardless whether there’s liquid present inside each chamber/pipe section!
14. Diaphragm Check Valves
Diaphragm check valves are used to prevent the backflow of fluids. They are used in hydraulic systems, chemical systems, and water treatment systems.
A diaphragm check valve consists of two main parts: a disc or one-way valve that rotates when pressurized and an elastomeric diaphragm that acts as a seal between the rotating disc and non-rotating body casing. The lever arm of the disc holds pressure on the elastomeric material until it is fully opened at which point some of this pressure is transmitted through the sealing surface to force flow from one side to another or vice versa.
15. Non-abrasive spherical valve check valve
The non-abrasive spherical check valve is a special type of check valve that is used to prevent backflow in sanitary piping systems that contain fluids with a high concentration of minerals.
There are three types of check valves: non-abrasive spherical valve check valves, non-abrasive linear valve check valves, and abrasive linear valve check valves.
The non-abrasive spherical check valve is made of an elastomer (rubber) material that will not wear out like metal or plastic valves. It features a metal ball that seals against the inside of the elastomer body. The metal ball has an outer surface that is coated with black oxide.
It is suitable for use in many different applications and industries including oil and gas, marine and offshore, chemical process, power generation, municipal water treatment, and food processing as well as many other applications.
16..Drilling tool check valve
A drilling tool check valve is a device designed to prevent the flow of fluid in one direction only. It is used in drills and other equipment that work by pumping fluids through pipes. As with all types of check valves, they will not allow fluid to flow backward when there is pressure on one side.
A drilling tool check valve works by having a ball or disc forced by the forward flow of fluid into a position where it prevents it from moving back. The spring then returns this piece back into place to close off any openings between two chambers when there is no pressure on one side.
As you can see, there are many different types of check valves. The most common ones are the swing and lift types, but there are also other options that you may want to consider based on your specific application.
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