[Guangzhou check valve] Model | Price | Technology | News | Manufacturer
2020-12-02 07:16:43
Definition, function and classification of check valves
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, 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. Check valves can also be used to give pressure that may rise above system pressure...
Working principle of check valve and common fault handling method
The function of this type of valve is to allow only the medium to flow in one direction and to prevent the direction from flowing. 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 check valve belongs to this type of valve, which includes a swing check valve and a lift check valve...
Among them, the check valve belongs to this type of valve, which includes a swing check valve and a lift check valve...
Check valve selection criteria
1. In order to prevent the medium from flowing backwards, a check valve should be installed on the equipment, equipment and pipelines;
2. The check valve is generally suitable for clean media, and should not be used for media containing solid particles and high viscosity;
3. Generally, vertical lift check valves should be used on horizontal pipes with a nominal 50mm pass;
4. Straight-flow lifting check valves can be installed on both horizontal and vertical pipes...
2. The check valve is generally suitable for clean media, and should not be used for media containing solid particles and high viscosity;
3. Generally, vertical lift check valves should be used on horizontal pipes with a nominal 50mm pass;
4. Straight-flow lifting check valves can be installed on both horizontal and vertical pipes...
Standard summary of check valves
SY/T5215-87 Drill Check Valve
GB/T12235-1989 Universal valve flange connection steel globe valve and lift check valve
GB/T1241-1983 Marine external thread forged steel cut-off check valve
GB/T12236-1989 Universal valve steel swing check valve...
GB/T12235-1989 Universal valve flange connection steel globe valve and lift check valve
GB/T1241-1983 Marine external thread forged steel cut-off check valve
GB/T12236-1989 Universal valve steel swing check valve...
Wafer type check valve performance and installation precautions
The wafer type check valve is a universal one-way fluid valve. The utility model has the advantages of light weight, small volume and easy to be installed between the flanges. The inside of the valve is composed of two semicircular springs and a plate surface, and is fixed on the valve body by a pin, and the spring is deformed to close the valve plate, and the fluid pressure causes the spring to open. The deformation is fast, which protects the pipe from water hammer damage.
When placing the pipe, care should be taken to make the direction of the flow of the wafer check valve consistent with the flow of the fluid...
When placing the pipe, care should be taken to make the direction of the flow of the wafer check valve consistent with the flow of the fluid...
Check valve structure improvement
The swing-type check valve is provided with a slow-closing auxiliary valve on the flap of the original swing check valve (Fig. 1). The auxiliary valve is installed on the lower side or both sides of the main valve flap and is screwed. When the normal flow valve of the medium is opened, the medium pressure opens the auxiliary valve, and the medium flows into the outlet end of the main valve through the small hole of the auxiliary valve, so that the main valve inlet end Pressure relief, the main valve flap opens, the pressure before and after the main valve tends to balance...
Test results before and after the improvement of the check valve slow-closing structure
The test device is shown in Figure 3. Using the calibrated pressure gauge, the pressure signal is sent to the oscilloscope for recording by the differential pressure transmitter, and the water hammer pressure change value at each moment is read on the oscillogram by the calibration ratio R. Figure 4 shows a comparison of the test results of the conventional structural check valve (a) with the conventional structural check valve with the slow-closing check valve (b).
The test valve has a diameter of 100 mm, a system pressure of 0.5 MPa, and a flow rate of 5 L/s. When the pump suddenly stops...
The test valve has a diameter of 100 mm, a system pressure of 0.5 MPa, and a flow rate of 5 L/s. When the pump suddenly stops...
Comparison of the clamp type check valve and the flange swing check valve
H76 type double-lobed butterfly check valve has small water hammer pressure, short valve stroke, spring-assisted closing, fast valve closing speed, short structural length, small size and light weight, which is convenient for valve installation and handling. Storage and piping arrangement
H44 type flange single-lobe rotary check valve has a large water hammer pressure, long valve stroke and long closure time. The structure length is long, bulky and heavy...
H44 type flange single-lobe rotary check valve has a large water hammer pressure, long valve stroke and long closure time. The structure length is long, bulky and heavy...
Selection, installation and protection measures for pump outlet check valve
1. Selection of pump outlet check valve General pump station engineering conditions, for the selection of pump outlet check valve, the following principles should be followed;
For pipelines with small diameter of pump outlet pipe, ie DN<50mm, lift check valve should be used.
For pipelines with a pump outlet diameter of DN ≥ 50mm, a swing-type check valve should be used......
For pipelines with small diameter of pump outlet pipe, ie DN<50mm, lift check valve should be used.
For pipelines with a pump outlet diameter of DN ≥ 50mm, a swing-type check valve should be used......
Guangzhou Ao Village Valve Co., Ltd. is a comprehensive enterprise headquartered in Shanghai, specializing in the development, production, sales and after-sales service of various types of valves, and agent sales of various imported valves. The main products of Guangzhou AoCun Valve Co., Ltd. are: ball valve, butterfly valve, globe valve, gate valve, check valve, plunger valve, regulating valve, filter, diaphragm valve, plug valve, needle valve, exhaust valve, mud valve, Traps, breathing valves, flame arresters, balancing valves, pipe clamp valves, discharge valves, pneumatic valves, electric valves, food-specific valve series, high temperature and high pressure valves, cryogenic valves, thermal insulation valves, hydraulic control valve series, vacuum valves, stainless steel Valves, rubber-lined fluorine valves, American standard Japanese standard German standard valve series, bellows valves, ammonia valves, etc. Connection methods are: flange connection, wire connection, clip connection, butt weld connection. (pressure from 1.0MPA-32MPA), (temperature -20 degrees -550 degrees). Materials are: Cast iron, cast steel, stainless steel, forged steel agents Foreign products are Japan: HITACHI (Hitachi), KITZ (Beize), valve days (VENN), Korea JK special valves, UK UK Valve International Co., Ltd. UK ( Youke) valve. Guangzhou Ao Village Valve Co., Ltd. products are widely used in chemical, petrochemical, petroleum, paper, mining, electric power, liquefied petroleum gas, food, pharmaceutical, water supply and drainage, municipal, mechanical equipment, electronics industry, urban construction and other fields. Products sell well all over the country, high quality, efficient service, won the trust of users and extensive praise. Guangzhou Ao Village Valve Co., Ltd. always takes quality as the basis, all meets the user's business philosophy, constantly applies new technology, new technology and new materials, and sincerely provides users with high quality valve products and more perfect after-sales service. Aocun valve originated from Taiwan, scientific management, mature design, exquisite craftsmanship, sophisticated equipment, meticulous processing, accurate testing, and has been well received by users since its sales. In the valve industry, there is the reputation of “Golden Body Villageâ€! Your needs, our goals!
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