Care must be taken when selecting a suitable stainless steel valve. In order to avoid ambiguity, you should have an understanding of stainless steel valves;
2, the requirements of the characteristics need to look at the flow resistance, discharge capacity, flow characteristics, sealing level and other information is how;
3. For the reliability and service life of the product, it is necessary to ask in detail;
4. If the chemical composition of the stainless steel valve does not meet the corresponding national standards, it does not need to be purchased and selected;
5. Because stainless steel valves are manual, electric, pneumatic, etc., it is necessary to clarify how the operation mode is;
6, when buying, you must choose a good after-sales service
Stainless steel valves are widely used in pipeline installations in petroleum, chemical, metallurgy, textile, food, shipbuilding, medical, environmental protection and other industrial sectors. They have the ability to resist atmospheric oxidation, ie, rust, and also contain acid. The ability of the alkali, salt medium to resist corrosion, that is, corrosion resistance.
STV Valve Technology Group Co., Ltd offers a wide range of stainless steel ball valve,stainless steel gate valve,stainless steel globe valve,stainless steel check valve,stainless steel foot valve .
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.
The function of the check valve: prevent the medium from flowing backward, prevent the pump and the drive motor from reversing, and release the container medium.
The 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, also called a check valve, a check valve, a reverse flow valve, and a back pressure valve. The check valve is an automatic valve.
The check valve is divided into three types according to the structure: the lift check valve, the swing check valve and the butterfly check valve:
Lift check valves are available in both vertical and horizontal versions.
The swing check valve is divided into three types: single-lobed, double-lobed, and multi-lobed.
The butterfly check valve is straight-through.
The above several check valves can be divided into four types: threaded connection, flanged connection, welded connection and clamped connection.
4, check valve installation (Check Valve) should pay attention to the following matters
A. Do not allow the check valve to bear weight in the pipeline. The large check valve should be independently supported so as not to be affected by the pressure generated by the piping system.
B. Pay attention to the direction of media flow when installing. It should be consistent with the direction of the arrow marked on the valve body.
C. The lift vertical flap check valve should be installed on the vertical pipe.
D. The lift horizontal flap check valve should be installed on the horizontal pipe.
