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function of check valve

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The check valve is mainly used to prevent the backflow of medium, reverse rotation of pump and drive motor, and discharge of container medium. The check valve can also be used to feed the auxiliary system whose pressure may rise above the system pressure.

Check valves are commonly used in our lives. What is the role of check valves?

Brief introduction of check valve
Check valve refers to a kind of valve whose opening and closing parts are round discs and whose action is generated by its own weight and medium pressure to block the backflow of medium. The structure of check valve can be divided into three categories, namely lifting check valve, swing check valve and butterfly check valve.

Function of check valve
The check valve is mainly used to prevent the backflow of medium, reverse rotation of pump and drive motor, and discharge of container medium. The check valve can also be used to feed the auxiliary system whose pressure may rise above the system pressure. The check valve can be divided into swing check valve (rotating according to the center of gravity) and lift check valve (moving along the axis).

Working principle of check valve
The check valve opens under the action of fluid pressure flowing in one direction; When the fluid flows in the opposite direction, the fluid pressure and the self reclosing valve disc of the valve disc act on the valve seat to cut off the flow. The check valve belongs to this type of valve, which includes swing check valve and lift check valve. The swing check valve has a hinge mechanism, and a valve flap like a door freely rests on the inclined valve seat surface. In order to ensure that the valve clack can reach the proper position of the valve seat surface each time, the valve clack is designed in the hinge mechanism, so that the valve clack has enough swing space, and the valve clack really and comprehensively contacts the valve seat.

STV VALVE offer Check Valve, Single Disc Check Valve CLASS 150, Single Disc Swing Check Valve, single disc swing check valve(forging body), Single Disc Wafer Swing Check Valve, Single Plate Wafer Check Valves, Thin Type Swing Check Valve, Thin Type Wafer Check Valve, Wafer Check Valve, Wafer Type Single Disc Swing Check Valve.

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what’s the Check valve opening pressure?

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Check valve refers to the valve that automatically opens and closes the valve disc depending on the flow of the medium itself to prevent the backflow of the medium, also known as check valve, one-way valve, reverse flow valve and back pressure valve. The check valve belongs to an automatic valve, which is mainly used to prevent medium backflow, reverse rotation of pump and driving motor, and discharge of container medium,if the opening pressure is too high, the system of our swing check valve may be overpressured, so the pressure in front of the check valve must be guaranteed.

What is the opening pressure of general swing check valve?

1.The pressure of swing opening has nothing to do with the size of the valve. It depends on the place of use of the valve.

2.The pressure drop of swing check valve is related to horizontal installation and vertical installation. If it is vertical installation, the pressure drop is equivalent to two elbows. If it is horizontal installation, the pressure drop is equivalent to the pressure generated by the weight of two elbows + disc of swing check valve.

3.The starting pressure of the swing check valve without spring is related to the thickness of the check plate. The thicker it is, the heavier it is. The greater the pressure difference before and after it can be opened

4.The starting pressure of swing check valve with spring is not only related to the thickness of check plate, but also related to spring.

 

The minimum upstream pressure required to operate the valve is called the cracking pressure, generally between 1 and 5 psi. Check valves are designed specifically with this number in mind. The degree of opening on a check valve is determined by the flow rate.

There is no problem using 2.5MPa swing check valve for 0.4MPa fluid

Generally, the used high-pressure pipes of check valves are within 5kg.

 

 

 

 

 

 

 

 

 

 

 

In need of assistance in selecting a check valve with a specific opening pressure? The experts at STV VA;VE have the knowledge and experience to help. Shop stvvalves.com today!

What is the cracking pressure of a check valve

FAQ

Do check valves have different pressures?

It also helps ensure the check valve and the application perform as expected. Sizing check valves is different from sizing many other types of flow control and shutoff valves. … The good news is that spring loaded or spring assist check valves are designed with a wide range of very specific cracking pressures.

What is valve opening pressure?

The set pressure, also called the opening pressure, of a safety or relief valve is the inlet pressure at which the valve begins to open as required by code.

What is a low pressure check valve?

A specialty diaphragm check valve that opens with virtually no forward pressure. In this position the sealing disc is supported internally allowing the valve to operate under high flow conditions with relatively no force or stress on the disc.

What is valve opening pressure?

The set pressure, also called the opening pressure, of a safety or relief valve is the inlet pressure at which the valve begins to open as required by code.

Does a check valve need pressure?

A check valve requires a minimum upstream pressure (pressure differential between inlet and outlet) to open the valve and allow flow through it. This minimum upstream pressure at which the valve opening occurs is called the check valve ‘cracking pressure’

STV DELIVERY THE WAFER CHECK VALVE,150LB,CF8M,DN300,2PCS

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VALVE:CHECK;STEEL,
300DIAX180MM L,
WAFER TYPE
QNSI SER#150 DBL
DISC 316+EPDM SEAT
APPLICATION:
POTABLE WATER
MFR: STV
CORPORATION OR
EQUIVALENT” NOTE:
SEAT MATERIAL: TO
BE
ADVISEDHS:848180409
0

The WAFER check valve refers to a valve that automatically opens and closes the valve flap by means of the flow of the medium itself, and is used to prevent the back flow of the medium, which is also called a check valve, a check valve, a reverse flow valve, and a back pressure valve. The check valve is an automatic valve whose main function is to prevent backflow of the medium, prevent the pump and drive motor from reversing, and discharge the container medium. The check valve can also be used to supply a line in which the pressure may rise to an auxiliary system that exceeds the system pressure. The check valve can be mainly divided into a swing type check valve (rotation according to the center of gravity) and a lift check valve (moving along the axis)

working principle
The function of this type of valve is to allow only the medium to flow in one direction and to prevent the flow in the opposite direction. Usually, the valve is automatically operated, and the valve flap is opened by the fluid pressure flowing in one direction; when the fluid flows in the opposite direction, the fluid pressure and the self-reclosing valve flap of the valve disc act on the valve seat to cut off the flow.
Among them, the stainless steel wafer type check valve belongs to this type of valve, and includes a swing type check valve and a lift check valve. The swing check valve has a hinge mechanism and a door-like flap that rests freely against the inclined seat surface. In order to ensure that the valve flap can reach the proper position of the valve seat surface each time, the valve flap is designed in the hinge mechanism, so that the valve flap has enough swinging space and the valve flap is truly and comprehensively in contact with the valve seat. The flaps can all be made of metal, or they can be inlaid with leather, rubber, or synthetic coverings depending on the performance requirements. With the swing-open check valve fully open, the fluid pressure is almost unimpeded, so the pressure drop across the valve is relatively small. The valve flap of the lift check valve is located on the valve seat sealing surface of the valve body. In addition to the flap being free to lift and lower, the valve is like a shut-off valve. The fluid pressure causes the flap to lift from the seat sealing surface. The backflow of the medium causes the flap to fall back onto the seat and shut off the flow. Depending on the conditions of use, the flap can be of all metal construction or it can be in the form of a rubber or rubber ring on the valve disc holder. Like the shut-off valve, the passage of fluid through the lift check valve is also narrow, so the pressure drop through the lift check valve is larger than that of the swing check valve, and the flow rate of the swing check valve is limited. Very few].

Technical Parameters
Nominal pressure or pressure level: PN1.0-16.0MPa, ANSI CLASS 150-900, JIS10-20K
Nominal diameter or caliber: DN15～900, NPS 1/4～36
Connection method: flange, butt welding, thread, socket welding, etc.
Applicable temperature: -196 ° C ~ 540 ° C
Body material: WCB, ZG1Cr18Ni9Ti, ZG1Cr18Ni12Mo2Ti, CF8 (304), CF3 (304L), CF8M (316), CF3M (316L), Ti.
Different materials can be used for water, steam, oil, nitric acid, acetic acid, oxidizing medium, urea and other media.

What is the purpose and structural characteristics of the swing check valve?

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Swing check valve is suitable for nominal pressure PN1.0MPa~42.0MPa, CLASS150Lb~2500Lb; nominal diameter DN15mm~1200mm, NPS1/2″~48″; working temperature -196C~540C for various pipelines, used for Prevent the media from flowing backwards. By using different materials, it can be applied to a variety of media such as water, steam, oil, nitric acid, strong oxidizing medium and urea.
The structure length is short, and its structure length is only 1/4~1/8 of the traditional flange check valve;
Small in size and light in weight, its weight is only 1/4~1/20 of the traditional flange check valve;
The valve flap is closed quickly and the water hammer pressure is small;
Both horizontal and vertical pipes can be used for easy installation;
Flow to smooth, fluid resistance is small;
Sensitive action and good sealing performance;
The valve flap has a short stroke and a small impact force;
The overall structure is simple and compact, and the shape is beautiful;
Long service life and high reliability

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