Common valve manual check valve common family valve selection experts suggest 5 attention

Common valve manual check valve common family valve selection experts suggest 5 attention

PN1.6 MPa ~ 16 MPa (ANSI > 1. Scope
This manual includes nominal diameter DN15mm~600mm(1/2″~24″), nominal pressure
PN1.6 MPa ~ 16 MPa (ANSI >
2. Use
2.1 The valve is used in pipes or devices to prevent media backflow.
2.2 Select the material of the valve according to the medium.
2.2.1 Carbon steel valve is suitable for water, steam, oil and other media.
2.2.2 Stainless steel valves are suitable for corrosive media.
2.3 Applicable temperature:
2.3.1 Common carbon steel valve applicable temperature is -29℃~+425℃
2.3.2 Alloy steel valve applicable temperature ≤550℃
2.3.3 The applicable temperature of stainless steel valve is -196℃~+200℃
Structure of 3.
3.1 Basic structure of check valve is shown in Figure 1
3.2 The gasket of wearing parts is made of polytetrafluoron or flexible graphite to ensure reliable sealing.
4. How it works
Check valve depends on the flow of the medium itself and automatically open and close the disc to prevent the medium from backflow.
5. Storage, maintenance, installation and use
5.1 The valve shall be stored in a dry and ventilated room, and both ends of the valve passage shall be blocked.
5.2 Valves stored for a long time should be inspected regularly for dirt. Special attention should be paid to the cleaning of the sealing surface to prevent the damage of the sealing surface.
5.3 Before installation, carefully check whether the valve mark is in accordance with the use requirements.
5.4 Before installation, the inner chamber and sealing surface of the valve should be checked. If there is dirt, it should be cleaned with a cleaning cloth.
5.5 Before installation, it should be noted that the flow direction mark on the valve is consistent with the flow direction of the medium.
5.6 Lift type vertical disc check valves shall be installed on vertical pipelines, lift type horizontal disc check valves and swing type check valves shall be installed on horizontal pipelines.
5.7 During use, attention should be paid to whether there is abnormal sound and vibration of the valve. In order to prevent the formation of water hammer effect in the pipeline, attention should be paid to the fluctuation of pipeline medium pressure.
6. The possible faults, causes, and elimination methods are shown in Table 1
Table 1 Possible faults, causes, and troubleshooting methods
The warranty of 7.
The manufacturer is responsible for the warranty of the valve within one year after it is put into use, but not more than 18 months after delivery. During the warranty period, due to product quality reasons can be repaired or replaced.
A. Flange connection lift check valve
B. Flanged swing check valves
Common family valve commonly used to buy experts suggest 5 attention to 1
When the purchase of visual inspection valve, the surface should be free of trachoma; Electroplating surface should be uniform luster, must pay attention to whether there are peeling, cracking, singed, exposed bottom, peeling, black spots and obvious pitting defects; The spray surface should be fine, smooth and uniform, without defects such as flow hanging and exposed bottom. {TodayHot}
Civil valves are commonly used by ordinary families in the form of gate valves, ball valves, triangle valves, etc., generally made of iron or copper.
Due to the good mechanical properties of copper alloy, it has the advantages of not easy to rust and strong corrosion resistance, so the copper valve has gradually replaced the iron valve. Triangle valve surface is basically using electroplating, its role is not only to control the flow of pipeline medium, but also to play a decorative role. The triangle valve is generally connected with pipes and water inlet hose for water nozzle, toilet water supply, and also connected with pipes and water inlet hose for water heater water supply.
Gate valves are basically used to connect pipes and water meters.
Ball valve for piping and water heater connection.
Because the ball valve opening and closing is more convenient than the gate valve, most of the pipes and water meters are connected by ball valves. {HotTag}
The purchase of civil valve:
Different types of civil valves should be selected according to the different requirements of users:
1. Visually inspect the valve when purchasing, and the surface should be free of trachoma; Electroplating surface should be uniform luster, must pay attention to whether there are peeling, cracking, singed, exposed bottom, peeling, black spots and obvious pitting defects; The spray surface should be fine, smooth and uniform, without defects such as flow hanging and exposed bottom. These defects will directly affect the service life of the valve.
2. The pipe thread of the valve is connected with pipeline, the apparent defect such as concave mark, broken tooth is observed on the surface of the thread when choose and buy, especially those who should notice is the screw of pipe thread and connector close effective length will affect the reliability of sealing, the effective length of pipe thread should notice when choose and buy. General DN15 cylinder pipe thread effective length in about 10mm.
3. Gate valves and ball valves are usually marked with nominal pressure on the valve body or handle, which can be selected according to their own needs.
4. When replacing the existing gate valve or ball valve, make sure that its structure length is clear so that it can not be installed after purchase.
5. Triangle valve pipe thread has two kinds of internal thread and external thread, according to the need to choose; What NOTICE EVEN IS THE TRIANGLE VALVE THAT THERE IS PARTIAL ZINC ALLOY TO MAKE ON THE MARKET AT PRESENT, THIS VALVE PRICE WANTS LOWER THAN GENERAL PRODUCT, BUT EASY CORROSION AND CAUSE FRACTURE.
Should BE IN AS FAR AS POSSIBLE FORMAL BUILDING MATERIALS STORE, SUPERMARKET CHOOSE AND BUY, SUCH PRODUCT QUALITY CAN ASSURE MORE.